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Online Calculators
Search 183 free calculators for finance, health, math, dates, conversions, statistics, and school work. Start with the question in your head, then check the formula, assumptions, and sources when the result matters.
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Mortgage paymentMonthly payment and payoff contextLoan paymentPayment, total interest, and balanceBMIBody mass index with category notesPercentagePercent of, increase, and decreaseDate differenceDays, weeks, and date additionGPACredits, grades, and weighted averageUnit conversionCommon metric and US conversionsCompound interestGrowth with contributions and time
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Money
Plan a payment or purchase
Estimate payments, interest, payoff pace, and the numbers behind a large purchase.
View categoryHealth
Check a body or fitness number
Use health calculators as educational estimates, then read the assumptions before acting on the result.
View categorySchool
Solve a class or homework question
Move quickly from a math, grade, or statistics question to the tool that returns the first useful answer.
View categoryTime
Count dates, age, or work hours
Calculate elapsed days, added dates, age, clock duration, and decimal work-hour totals.
View categoryConvert
Translate one unit into another
Convert common units without digging through a table, then confirm the input units before using the result.
View categoryAnalyze
Summarize a small data set
Find averages, variation, random values, ratios, and other quick statistics for everyday analysis.
View categoryMost used calculators
Common calculators people open first
Finance CalculatorsMortgage CalculatorKey result: Estimated total monthly paymentOpen calculatorFinance CalculatorsLoan CalculatorKey result: Monthly paymentOpen calculatorFinance CalculatorsAuto Loan CalculatorKey result: Monthly paymentOpen calculatorFinance CalculatorsCompound Interest CalculatorKey result: Future valueOpen calculatorFinance CalculatorsCredit Card CalculatorKey result: Estimated interest this cycleOpen calculatorHealth CalculatorsBMI CalculatorKey result: BMIOpen calculatorHealth CalculatorsCalorie CalculatorKey result: Estimated maintenance caloriesOpen calculatorMath CalculatorsPercentage CalculatorKey result: Percent of numberOpen calculatorMath CalculatorsScientific CalculatorKey result: ResultOpen calculatorEducation CalculatorsGPA CalculatorKey result: GPAOpen calculatorDate and Time CalculatorsDate CalculatorKey result: DifferenceOpen calculatorConversion CalculatorsUnit Conversion CalculatorKey result: Converted valueOpen calculator
All calculators by category
Browse 183 searchable calculators
Start from the category that matches the job. High-risk pages that are still under review stay out of this public index until their source and risk checks are approved.
Math Calculators
Use these math calculators for percentages, fractions, ratios, and everyday number checks.
Math CalculatorsArea CalculatorReturns Area. Calculate area from shape and length with this area calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsBasic CalculatorReturns Result. Calculate result from expression and decimal places with this basic calculator; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsBig Number CalculatorReturns Result. Calculate result from operation and first integer with this big number calculator; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsCircle CalculatorReturns Radius. Calculate radius from known value and length with this circle calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsCommon Factor CalculatorReturns Common factors. Calculate common factors from integers with this common factor calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsDice RollerReturns Dice notation. Calculate dice notation from number of dice and sides per die with this dice roller; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsDistance CalculatorReturns Distance. Calculate distance from first point x and first point y with this distance calculator; review the formula, rounding, worked example, and related.Open calculatorMath CalculatorsExponent CalculatorReturns Result. Calculate result from base and exponent with this exponent calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsFactor CalculatorReturns Factors. Calculate factors from integer with this factor calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsFraction CalculatorReturns Result. Use this fraction calculator to add, subtract, multiply, divide, simplify fractions, and convert the result to decimal.Open calculatorMath CalculatorsGCF CalculatorReturns Greatest common factor. Calculate greatest common factor from integers with this GCF calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsHalf-Life CalculatorReturns Remaining amount. Calculate remaining amount from solve for and initial amount with this half-life calculator; review the formula, rounding, worked example, and related.Open calculatorMath CalculatorsLCM CalculatorReturns Least common multiple. Calculate least common multiple from integers with this LCM calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsLog CalculatorReturns Logarithm. Calculate logarithm from number and base with this log calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsLong Division CalculatorReturns Quotient. Calculate quotient from dividend and divisor with this long division calculator; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsMatrix CalculatorReturns Result matrix. Calculate result matrix from operation and matrix A with this matrix calculator; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsNumber Sequence CalculatorReturns Generated terms. Calculate generated terms from sequence type and first term with this number sequence calculator; review the formula, rounding, worked example.Open calculatorMath CalculatorsPassword GeneratorReturns Generated password. Generate generated password from password length and uppercase letters with this password generator; review the formula, rounding, worked example.Open calculatorMath CalculatorsPercent Error CalculatorReturns Percent error. Calculate percent error from measured value and accepted value with this percent error calculator; review the formula, rounding, worked example.Open calculatorMath CalculatorsPercentage CalculatorReturns Percent of number. Use this percentage calculator to find percentages, percentage increase or decrease, and what percent one number is of another.Open calculatorMath CalculatorsPrime Factorization CalculatorReturns Prime factorization. Calculate prime factorization from integer with this prime factorization calculator; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsPythagorean Theorem CalculatorReturns Missing side. Calculate missing side from missing side and leg a with this pythagorean theorem calculator; review the formula, rounding, worked example, and related.Open calculatorMath CalculatorsQuadratic Formula CalculatorReturns First root real part. Calculate first root real part from coefficient a and coefficient b with this quadratic formula calculator; review the formula, rounding, worked example.Open calculatorMath CalculatorsRandom Number GeneratorReturns Generated numbers. Generate generated numbers from minimum and maximum with this random number generator; review the formula, rounding, worked example, and related.Open calculatorMath CalculatorsRatio CalculatorReturns Matching second value. Use this ratio calculator to simplify ratios, find equivalent ratios, and calculate a matching value by proportion.Open calculatorMath CalculatorsRight Triangle CalculatorReturns Hypotenuse. Calculate hypotenuse from leg A and leg B with this right triangle calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsRoot CalculatorReturns Real root. Calculate real root from number and root degree with this root calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsRounding CalculatorReturns Rounded value. Calculate rounded value from number and places with this rounding calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsScientific CalculatorReturns Result. Calculate result from expression and angle mode with this scientific calculator; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsScientific Notation CalculatorReturns Scientific notation. Calculate scientific notation from conversion and decimal number with this scientific notation calculator; review the formula, rounding, worked example.Open calculatorMath CalculatorsSimple Interest CalculatorReturns Interest amount. Calculate interest amount from principal and annual interest rate with this simple interest calculator; review the formula, rounding, worked example.Open calculatorMath CalculatorsSlope CalculatorReturns Slope. Calculate slope from first point x and first point y with this slope calculator; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsSurface Area CalculatorReturns Surface area. Calculate surface area from shape and length with this surface area calculator; review the formula, rounding, worked example, and related calculator.Open calculatorMath CalculatorsTriangle CalculatorReturns Area. Calculate area from side a and side b with this triangle calculator; review the formula, rounding, worked example, and related calculator checks.Open calculatorMath CalculatorsVolume CalculatorReturns Volume. Calculate volume from shape and length with this volume calculator; review the formula, rounding, worked example, and related calculator checks.Open calculator
Date and Time Calculators
Calculate ages, date differences, clock durations, and total hours with clear calendar assumptions.
Date and Time CalculatorsAge CalculatorReturns Age. Use this age calculator to calculate age in years, months, days, total days, and next birthday from two dates.Open calculatorDate and Time CalculatorsDate CalculatorReturns Difference. Use this date calculator to find days between dates, difference in weeks, and a date after adding days.Open calculatorDate and Time CalculatorsDay CounterReturns Elapsed days. Count elapsed days from start date and end date with this day counter; check endpoints, date or time rules, and the example before planning.Open calculatorDate and Time CalculatorsDay of the Week CalculatorReturns Day of the week. Calculate day of the week from date with this day of the week calculator; check endpoints, date or time rules, and the example before planning.Open calculatorDate and Time CalculatorsHours CalculatorReturns Total hours. Use this hours calculator to add decimal hours, find total hours, average hours, and counted entries.Open calculatorDate and Time CalculatorsTime CalculatorReturns Result. Calculate result from base hours and base minutes with this time calculator; check endpoints, date or time rules, and the example before planning.Open calculatorDate and Time CalculatorsTime Duration CalculatorReturns Net duration. Use this time duration calculator to find hours and minutes between two times, including overnight spans and breaks.Open calculatorDate and Time CalculatorsTime Zone CalculatorReturns Converted time. Calculate converted time from source date and time and from time zone with this time zone calculator; check endpoints, date or time rules, and.Open calculator
Conversion Calculators
Convert common length and mass units using documented factors and visible assumptions.
Conversion CalculatorsBandwidth CalculatorReturns Transfer time. Calculate transfer time from calculation mode and data amount with this bandwidth calculator; check units, factor direction, rounding, and the worked.Open calculatorConversion CalculatorsBase64 Encode / DecodeReturns Output text. Calculate output text from operation and text with this base64 encode / decode calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsBinary CalculatorReturns Decimal. Calculate decimal from binary integer with this binary calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsBTU CalculatorReturns Estimated cooling capacity. Calculate estimated cooling capacity from room area and sun/shade with this BTU calculator; check units, factor direction, rounding, and the worked.Open calculatorConversion CalculatorsConcrete CalculatorReturns Estimated order volume. Calculate estimated order volume from length and width with this concrete calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsDensity CalculatorReturns Mass. Calculate mass from solve for and mass with this density calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsEngine Horsepower CalculatorReturns Engine horsepower. Calculate engine horsepower from measured engine torque and torque unit with this engine horsepower calculator; check units, factor direction, rounding.Open calculatorConversion CalculatorsGas Mileage CalculatorReturns Fuel economy. Calculate fuel economy from distance traveled and distance unit with this gas mileage calculator; check units, factor direction, rounding, and the worked.Open calculatorConversion CalculatorsGravel CalculatorReturns Estimated weight. Calculate estimated weight from length and width with this gravel calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsHex CalculatorReturns Decimal. Calculate decimal from hexadecimal integer with this hex calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsHorsepower CalculatorReturns Horsepower. Calculate horsepower from solve for and torque with this horsepower calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsIP Subnet CalculatorReturns CIDR block. Calculate CIDR block from ipv4 address and CIDR prefix length with this IP subnet calculator; check units, factor direction, rounding, and the worked.Open calculatorConversion CalculatorsMass CalculatorReturns Mass. Calculate mass from net force and force unit with this mass calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsMolarity CalculatorReturns Molarity. Calculate molarity from solve for and molarity with this molarity calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsMolecular Weight CalculatorReturns Molar mass. Calculate molar mass from chemical formula with this molecular weight calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsMulch CalculatorReturns Approximate bags. Calculate approximate bags from length and width with this mulch calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsOhm's Law CalculatorReturns Voltage. Calculate voltage from solve for and voltage with this ohm's law calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsResistor CalculatorReturns Resistance. Calculate resistance from band count and first digit band with this resistor calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsRoman Numeral ConverterReturns Roman numeral. Convert roman numeral from conversion and value with this roman numeral converter; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsRoofing CalculatorReturns Area with waste. Calculate area with waste from building length and building width with this roofing calculator; check units, factor direction, rounding, and the worked.Open calculatorConversion CalculatorsShoe Size ConversionReturns Mondopoint estimate. Convert mondopoint estimate from foot length with this shoe size conversion calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsSpeed CalculatorReturns Distance. Calculate distance from solve for and distance with this speed calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsSquare Footage CalculatorReturns Area per item. Calculate area per item from length and width with this square footage calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsTile CalculatorReturns Estimated tiles to buy. Calculate estimated tiles to buy from surface length and surface width with this tile calculator; check units, factor direction, rounding, and the worked.Open calculatorConversion CalculatorsTire Size CalculatorReturns Current diameter. Calculate current diameter from current section width and current aspect ratio with this tire size calculator; check units, factor direction, rounding.Open calculatorConversion CalculatorsUnit Conversion CalculatorReturns Converted value. Use this unit converter to convert common length and mass units, including meters, feet, kilograms, pounds, and more.Open calculatorConversion CalculatorsURL Encode / DecodeReturns Output text. Calculate output text from operation and text with this URL encode / decode calculator; check units, factor direction, rounding, and the worked example.Open calculatorConversion CalculatorsWeight CalculatorReturns Mass. Calculate mass from mass and mass unit with this weight calculator; check units, factor direction, rounding, and the worked example.Open calculator
Statistics Calculators
Calculate averages and standard deviation with formulas, examples, and sample versus population notes.
Statistics CalculatorsAverage CalculatorReturns Average. Use this average calculator to find the mean, sum, count, minimum, and maximum of a list of numbers.Open calculatorStatistics CalculatorsConfidence Interval CalculatorReturns Lower bound. Calculate lower bound from sample mean and population standard deviation with this confidence interval calculator; review parsing, sample assumptions.Open calculatorStatistics CalculatorsGolf Handicap CalculatorReturns Estimated Handicap Index. Calculate estimated handicap index from score records with this golf handicap calculator; review parsing, sample assumptions, outliers, and related data.Open calculatorStatistics CalculatorsMean Median Mode Range CalculatorReturns Mean. Calculate mean from values with this mean median mode range calculator; review parsing, sample assumptions, outliers, and related data tools.Open calculatorStatistics CalculatorsMedian CalculatorReturns Median. Calculate median from values with this median calculator; review parsing, sample assumptions, outliers, and related data tools.Open calculatorStatistics CalculatorsP-Value CalculatorReturns p-value. Calculate p-value from sample mean and hypothesized mean with this P-value calculator; review parsing, sample assumptions, outliers, and related data.Open calculatorStatistics CalculatorsPermutation and Combination CalculatorReturns Count. Calculate count from total distinct items and items selected or positions with this permutation and combination calculator; review parsing, sample.Open calculatorStatistics CalculatorsProbability CalculatorReturns Probability of A or B. Calculate probability of A or B from probability of A and probability of B with this probability calculator; review parsing, sample assumptions, outliers.Open calculatorStatistics CalculatorsSample Size CalculatorReturns Required sample size. Calculate required sample size from confidence level and margin of error with this sample size calculator; review parsing, sample assumptions, outliers.Open calculatorStatistics CalculatorsStandard Deviation CalculatorReturns Standard deviation. Use this standard deviation calculator to calculate population or sample standard deviation, variance, mean, and count.Open calculatorStatistics CalculatorsStatistics CalculatorReturns Count. Calculate count from values and variance mode with this statistics calculator; review parsing, sample assumptions, outliers, and related data tools.Open calculatorStatistics CalculatorsVariance CalculatorReturns Variance. Calculate variance from values and data type with this variance calculator; review parsing, sample assumptions, outliers, and related data tools.Open calculatorStatistics CalculatorsZ-Score CalculatorReturns Z-score. Calculate Z-score from observed value and mean with this Z-score calculator; review parsing, sample assumptions, outliers, and related data tools.Open calculator
Finance Calculators
Use these finance calculators for interest, loan payment, and repayment checks with visible assumptions.
Finance CalculatorsAmortization CalculatorReturns Monthly payment. Calculate monthly payment from loan amount and annual rate with this amortization calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsAuto Lease CalculatorReturns Estimated monthly payment. Calculate estimated monthly payment from MSRP and negotiated price with this auto lease calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsAuto Loan CalculatorReturns Monthly payment. Calculate monthly payment from vehicle price and down payment with this auto loan calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsAverage Return CalculatorReturns Arithmetic average return. Calculate arithmetic average return from period returns with this average return calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsBoat Loan CalculatorReturns Monthly payment. Calculate monthly payment from boat price and down payment with this boat loan calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsBudget CalculatorReturns Total planned outflow. Calculate total planned outflow from monthly take-home income and housing with this budget calculator; compare assumptions, timing, fees, and source.Open calculatorFinance CalculatorsBusiness Loan CalculatorReturns Monthly debt service. Calculate monthly debt service from loan amount and annual rate with this business loan calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsCash Back or Low Interest CalculatorReturns Better option. Calculate better option from vehicle price and down payment with this cash back or low interest calculator; compare assumptions, timing, fees, and source.Open calculatorFinance CalculatorsCD CalculatorReturns Maturity value. Calculate maturity value from deposit amount and annual percentage yield with this CD calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsCommission CalculatorReturns Commission amount. Calculate commission amount from sales amount and commission rate with this commission calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsCompound Interest CalculatorReturns Future value. Calculate future value from initial principal and annual interest rate with this compound interest calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsCredit Card CalculatorReturns Estimated interest this cycle. Calculate estimated interest this cycle from current balance and purchase APR with this credit card calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsCredit Card Payoff CalculatorReturns Payoff time. Calculate payoff time from credit card balance and purchase APR with this credit card payoff calculator; compare assumptions, timing, fees, and source.Open calculatorFinance CalculatorsCurrency CalculatorReturns Converted amount after fee. Calculate converted amount after fee from amount and exchange rate with this currency calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsDebt Consolidation CalculatorReturns Current payoff time. Calculate current payoff time from total debt to consolidate and current blended annual rate with this debt consolidation calculator; compare assumptions.Open calculatorFinance CalculatorsDebt Payoff CalculatorReturns Avalanche payoff time. Calculate avalanche payoff time from debt 1 balance and debt 1 APR with this debt payoff calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsDebt Ratio CalculatorReturns Back-end DTI. Calculate back-end DTI from gross monthly income and monthly housing payment with this debt ratio calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsDiscount CalculatorReturns Discount amount. Calculate discount amount from original price and discount with this discount calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsDown Payment CalculatorReturns Down payment amount. Calculate down payment amount from home price and down payment percentage with this down payment calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsElectricity CalculatorReturns Cost for period. Calculate cost for period from power and power unit with this electricity calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsFinance CalculatorReturns Future value. Calculate future value from solve for and present value with this finance calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsFuel Cost CalculatorReturns Total fuel cost. Calculate total fuel cost from distance and distance unit with this fuel cost calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsFuture Value CalculatorReturns Future value. Calculate future value from present value and periodic payment with this future value calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsHELOC CalculatorReturns Interest-only payment. Calculate interest-only payment from credit limit and current balance with this HELOC calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsHome Equity Loan CalculatorReturns Monthly payment. Calculate monthly payment from home value and current mortgage balance with this home equity loan calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsHouse Affordability CalculatorReturns Estimated affordable home price. Calculate estimated affordable home price from annual gross income and monthly debt payments with this house affordability calculator; compare.Open calculatorFinance CalculatorsInflation CalculatorReturns Inflation-adjusted amount. Calculate inflation-adjusted amount from calculation mode and amount with this inflation calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsInterest CalculatorReturns Interest amount. Calculate interest amount from principal and annual rate with this interest calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsInterest Rate CalculatorReturns Annual rate. Calculate annual rate from principal and final amount with this interest rate calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsLease CalculatorReturns Estimated monthly payment. Calculate estimated monthly payment from adjusted capitalized cost and residual value with this lease calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsLoan CalculatorReturns Monthly payment. Calculate monthly payment from loan amount and annual rate with this loan calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsMargin CalculatorReturns Gross profit. Calculate gross profit from revenue or selling price and direct cost or COGS with this margin calculator; compare assumptions, timing, fees, and source.Open calculatorFinance CalculatorsMileage CalculatorReturns Distance. Calculate distance from distance and distance unit with this mileage calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsMortgage Amortization CalculatorReturns Monthly payment. Calculate monthly payment from loan amount and annual interest rate with this mortgage amortization calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsMortgage CalculatorReturns Estimated total monthly payment. Calculate estimated total monthly payment from home price and down payment with this mortgage calculator; compare assumptions, timing, fees, and source.Open calculatorFinance CalculatorsMortgage Payoff CalculatorReturns Payoff time with extra payment. Calculate payoff time with extra payment from current mortgage balance and annual interest rate with this mortgage payoff calculator; compare assumptions.Open calculatorFinance CalculatorsPayback Period CalculatorReturns Payback period. Calculate payback period from initial investment and cash flow per period with this payback period calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsPayment CalculatorReturns Monthly payment. Calculate monthly payment from loan amount and annual rate with this payment calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsPercent Off CalculatorReturns Savings amount. Calculate savings amount from original price and percent off with this percent off calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsPersonal Loan CalculatorReturns Monthly payment. Calculate monthly payment from loan amount and annual rate with this personal loan calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsPresent Value CalculatorReturns Present value. Calculate present value from future value and periodic payment with this present value calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsRefinance CalculatorReturns New monthly payment. Calculate new monthly payment from current loan balance and current annual rate with this refinance calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsRent CalculatorReturns Total monthly housing cost. Calculate total monthly housing cost from monthly take-home income and monthly rent with this rent calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsRepayment CalculatorReturns Repayment time. Calculate repayment time from balance and annual rate with this repayment calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsROI CalculatorReturns ROI. Calculate ROI from initial investment and final value with this ROI calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsSavings CalculatorReturns Required contribution. Calculate required contribution from savings goal and current savings with this savings calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsStudent Loan CalculatorReturns Monthly payment. Calculate monthly payment from current loan balance and capitalized interest with this student loan calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsTip CalculatorReturns Tip amount. Calculate tip amount from bill amount and tip with this tip calculator; compare assumptions, timing, fees, and source notes before using the scenario.Open calculatorFinance CalculatorsAnnuity CalculatorReturns Future value. Calculate future value from starting amount and payment per period with this annuity calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsAnnuity Payout CalculatorReturns Payout per period. Calculate payout per period from present value and annual rate assumption with this annuity payout calculator; compare assumptions, timing, fees.Open calculatorFinance CalculatorsAPR CalculatorReturns Estimated APR. Calculate estimated APR from loan principal and prepaid finance charges with this APR calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsBond CalculatorReturns Price from yield. Calculate price from yield from face value and coupon rate with this bond calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsCanadian Mortgage CalculatorReturns Monthly mortgage payment. Calculate monthly mortgage payment from mortgage amount and annual interest rate with this canadian mortgage calculator; compare assumptions, timing.Open calculatorFinance CalculatorsCollege Cost CalculatorReturns Projected first-year cost. Calculate projected first-year cost from current annual cost and years until enrollment with this college cost calculator; compare assumptions, timing.Open calculatorFinance CalculatorsDepreciation CalculatorReturns Current year depreciation. Calculate current year depreciation from asset cost and salvage value with this depreciation calculator; compare assumptions, timing, fees, and source.Open calculatorFinance CalculatorsGDP CalculatorReturns Real GDP. Calculate real GDP from solve for and nominal GDP with this GDP calculator; compare assumptions, timing, fees, and source notes before using the scenario.Open calculatorFinance CalculatorsInvestment CalculatorReturns Future value. Calculate future value from initial investment and contribution per period with this investment calculator; compare assumptions, timing, fees, and source.Open calculatorFinance CalculatorsIRR CalculatorReturns IRR per period. Calculate IRR per period from cash flows and periods per year with this IRR calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsMutual Fund CalculatorReturns Ending value after costs. Calculate ending value after costs from initial investment and contribution per period with this mutual fund calculator; compare assumptions, timing.Open calculatorFinance CalculatorsReal Estate CalculatorReturns Monthly cash flow. Calculate monthly cash flow from purchase price and down payment with this real estate calculator; compare assumptions, timing, fees, and source notes.Open calculatorFinance CalculatorsRent vs Buy CalculatorReturns Buying cost minus renting cost. Calculate buying cost minus renting cost from current monthly rent and annual rent increase with this rent vs buy calculator; compare assumptions, timing.Open calculatorFinance CalculatorsRental Property CalculatorReturns Net operating income. Calculate net operating income from purchase price and down payment with this rental property calculator; compare assumptions, timing, fees, and source.Open calculatorFinance CalculatorsSalary CalculatorReturns Annual gross pay. Calculate annual gross pay from pay amount and pay period with this salary calculator; compare assumptions, timing, fees, and source notes before using.Open calculatorFinance CalculatorsUK Mortgage CalculatorReturns Estimated total monthly payment. Calculate estimated total monthly payment from mortgage type and property price with this UK mortgage calculator; compare assumptions, timing, fees.Open calculator
Health Calculators
Use health calculators for basic educational estimates with conservative assumptions and visible limitations.
Health CalculatorsBMI CalculatorReturns BMI. Calculate BMI from age and height with this BMI calculator; review formula limits, source notes, and when to verify with a professional.Open calculatorHealth CalculatorsBMR CalculatorReturns Estimated BMR. Calculate estimated BMR from age and sex used by equation with this BMR calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsBody Fat CalculatorReturns Estimated body fat. Calculate estimated body fat from age and sex used by equation with this body fat calculator; review formula limits, source notes, and when to verify.Open calculatorHealth CalculatorsBody Type CalculatorReturns Apparel body type. Calculate apparel body type from bust circumference and waist circumference with this body type calculator; review formula limits, source notes, and when.Open calculatorHealth CalculatorsBra Size CalculatorReturns Estimated bra size. Calculate estimated bra size from underbust measurement and bust measurement with this bra size calculator; review formula limits, source notes, and when.Open calculatorHealth CalculatorsCalorie CalculatorReturns Estimated maintenance calories. Calculate estimated maintenance calories from age and sex used by equation with this calorie calculator; review formula limits, source notes, and when.Open calculatorHealth CalculatorsCalories Burned CalculatorReturns Estimated calories burned. Calculate estimated calories burned from weight and weight unit with this calories burned calculator; review formula limits, source notes, and when.Open calculatorHealth CalculatorsCarbohydrate CalculatorReturns Carbohydrate. Calculate carbohydrate from daily calorie target and carbohydrate with this carbohydrate calculator; review formula limits, source notes, and when.Open calculatorHealth CalculatorsDew Point CalculatorReturns Dew point. Calculate dew point from air temperature and temperature unit with this dew point calculator; review formula limits, source notes, and when to verify.Open calculatorHealth CalculatorsFat Intake CalculatorReturns Fat. Calculate fat from daily calorie target and fat with this fat intake calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsHeat Index CalculatorReturns Heat index. Calculate heat index from air temperature and temperature unit with this heat index calculator; review formula limits, source notes, and when to verify.Open calculatorHealth CalculatorsLean Body Mass CalculatorReturns Estimated lean body mass. Calculate estimated lean body mass from age and sex used by equation with this lean body mass calculator; review formula limits, source notes, and when.Open calculatorHealth CalculatorsMacro CalculatorReturns Protein. Calculate protein from daily calorie target and protein with this macro calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsOne Rep Max CalculatorReturns Estimated 1RM. Calculate estimated 1RM from weight lifted and weight unit with this one rep max calculator; review formula limits, source notes, and when to verify.Open calculatorHealth CalculatorsPace CalculatorReturns Pace per mile. Calculate pace per mile from distance and distance unit with this pace calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsProtein CalculatorReturns Adult RDA estimate. Calculate adult RDA estimate from age and weight with this protein calculator; review formula limits, source notes, and when to verify with a professional.Open calculatorHealth CalculatorsTDEE CalculatorReturns Estimated TDEE. Calculate estimated TDEE from age and sex used by equation with this TDEE calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsWind Chill CalculatorReturns Wind chill. Calculate wind chill from air temperature and temperature unit with this wind chill calculator; review formula limits, source notes, and when to verify.Open calculatorHealth CalculatorsBAC CalculatorReturns Estimated BAC. Calculate estimated BAC from standard drinks and body weight with this BAC calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsBody Surface Area CalculatorReturns Mosteller BSA. Calculate mosteller BSA from age and height with this body surface area calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsConception CalculatorReturns Estimated ovulation date. Calculate estimated ovulation date from first day of last period and regular cycle length with this conception calculator; review formula limits, source.Open calculatorHealth CalculatorsDue Date CalculatorReturns Estimated due date. Calculate estimated due date from dating method and first day of last period with this due date calculator; review formula limits, source notes, and when.Open calculatorHealth CalculatorsGFR CalculatorReturns Estimated GFR. Calculate estimated GFR from age and sex used by equation with this GFR calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsHealthy Weight CalculatorReturns Healthy weight starts at. Calculate healthy weight starts at from age and height with this healthy weight calculator; review formula limits, source notes, and when to verify.Open calculatorHealth CalculatorsIdeal Weight CalculatorReturns Devine estimate. Calculate devine estimate from age and sex used by equation with this ideal weight calculator; review formula limits, source notes, and when to verify.Open calculatorHealth CalculatorsOverweight CalculatorReturns BMI. Calculate BMI from age and height with this overweight calculator; review formula limits, source notes, and when to verify with a professional.Open calculatorHealth CalculatorsOvulation CalculatorReturns Estimated ovulation date. Calculate estimated ovulation date from last period start date and average cycle length with this ovulation calculator; review formula limits, source.Open calculatorHealth CalculatorsPeriod CalculatorReturns Estimated next period start. Calculate estimated next period start from last period start date and average cycle length with this period calculator; review formula limits, source.Open calculatorHealth CalculatorsPregnancy CalculatorReturns Estimated due date. Calculate estimated due date from first day of last period and regular cycle length with this pregnancy calculator; review formula limits, source notes.Open calculatorHealth CalculatorsPregnancy Conception CalculatorReturns Estimated conception date. Calculate estimated conception date from known date type and estimated due date with this pregnancy conception calculator; review formula limits, source.Open calculatorHealth CalculatorsPregnancy Weight Gain CalculatorReturns Pre-pregnancy BMI. Calculate pre-pregnancy BMI from height before pregnancy and height unit with this pregnancy weight gain calculator; review formula limits, source notes.Open calculatorHealth CalculatorsSleep CalculatorReturns Recommended sleep. Calculate recommended sleep from age group and plan from with this sleep calculator; review formula limits, source notes, and when to verify with.Open calculatorHealth CalculatorsTarget Heart Rate CalculatorReturns Age-predicted maximum heart rate. Calculate age-predicted maximum heart rate from age with this target heart rate calculator; review formula limits, source notes, and when to verify.Open calculator
Education Calculators
Use education calculators for grades, GPA, and class-score planning with visible grading assumptions.
Education CalculatorsGPA CalculatorReturns GPA. Calculate GPA from courses with this GPA calculator; check weights, credits, grading assumptions, and the next school-planning step.Open calculatorEducation CalculatorsGrade CalculatorReturns Current weighted average. Calculate current weighted average from completed items and target grade with this grade calculator; check weights, credits, grading assumptions, and.Open calculator
Accuracy and sources
Every calculator should explain what the number means
Pages include the inputs, key result, assumptions, source notes, related calculators, and review dates where the topic needs them. The calculator stays first, and the explanation helps users decide what to check next.
- The first HTML response includes useful, indexable calculator content.
- Formula logic is kept separate from the React interface.
- Finance and health pages show limitations instead of pretending to give advice.
- Related links point to likely next-step calculators, not random directory filler.
Online calculators FAQ
How do I find the right calculator?
Search for the job you need to do, such as mortgage payment, BMI, percentage, date difference, GPA, or unit conversion. You can also start from a category or use the full calculator directory on this page.
Are these calculators free?
Yes. The calculators are free to use and do not require an account. Some pages include notes, sources, and assumptions so you can understand the result before relying on it.
Can I rely on finance or health results?
Treat finance and health results as educational estimates. Check the visible assumptions, review date, and limitations on the calculator page, and consult a qualified professional before making medical, tax, investment, or legal decisions.
Why can my result differ from another site?
Calculators can use different defaults, rounding rules, date handling, unit conventions, fees, or compounding assumptions. Compare the assumptions first when two results do not match.