Percentage Calculator
Calculate a percentage of a number or find what percentage one value is of another.
Open calculator170+ tools across 12 categories
Free Online Calculators
Browse our full collection — finance, health, math, percentage, age & date, and more. Every tool works right in your browser.
05 focused tools
Percentage Calculators
5 focused tools
Percentage Increase Calculator
Find the percentage increase from an original value to a larger new value.
Open calculatorPercentage Decrease Calculator
Find the percentage decrease from an original value to a smaller new value.
Open calculatorPercentage Change Calculator
Calculate the signed percentage change between an original and a new value.
Open calculatorPercentage Difference Calculator
Compare two values symmetrically using their average as the reference.
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Business & Price Calculators
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Discount Calculator
Calculate the final price and money saved from a percentage discount.
Open calculatorMarkup Calculator
Add a markup percentage to cost and calculate the selling price.
Open calculatorProfit Margin Calculator
Calculate profit and profit margin percentage from revenue and cost.
Open calculatorTip Calculator
Calculate a tip, total bill and equal amount per person.
Open calculatorTax Calculator
Add a percentage tax rate to a price and calculate the final amount.
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Percentage Converters
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Percentage to Decimal Converter
Convert a percentage to its decimal equivalent instantly.
Open calculatorDecimal to Percentage Converter
Convert a decimal to a percentage instantly.
Open calculatorFraction to Percentage Converter
Convert a fraction to its percentage and decimal equivalents.
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Advanced Percentage Calculators
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Reverse Percentage Calculator
Find the original value before a percentage increase or decrease was applied.
Open calculatorPercentage Error Calculator
Calculate the percentage error between an observed value and the actual value.
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Age & Date Calculators
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Age Calculator
Calculate your exact age in years, months and days from your date of birth.
Open calculatorBirthday Countdown
Count down the days, weeks and months until your next birthday.
Open calculatorAge on a Specific Date
Find out how old you were (or will be) on any specific date in the past or future.
Open calculatorDays Since Birth
Calculate the total number of days you have been alive since your date of birth.
Open calculatorMonths Since Birth
Find out how many months you have been alive, plus extra days.
Open calculatorWeeks Since Birth
Calculate how many weeks you have been alive, with extra days.
Open calculatorNext Birthday Calculator
Find out the exact date of your next birthday and how many days until then.
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Date Difference Tools
1 focused tool
Date Difference Calculator
Find the exact difference between any two dates in years, months, days and weeks.
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Retirement Planning
1 focused tool
Retirement Age Calculator
See your chosen retirement target date and the time remaining until then.
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Pet Age & Fun Tools
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Pet Age Calculator
Convert your dog or cat's age to human years using veterinary life stage estimates.
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Finance Calculators
55 focused tools
Loan Calculator
Calculate monthly loan payments, total interest and total repayment for any loan.
Open calculatorMortgage Calculator
Calculate monthly mortgage payments including principal, interest and amortization schedule.
Open calculatorCompound Interest Calculator
Calculate how your savings grow with compound interest over time.
Open calculatorInvestment Calculator
Project the future value of an investment with regular contributions.
Open calculatorROI Calculator
Calculate return on investment as a percentage from your gain and cost.
Open calculatorSalary Calculator
Convert between hourly, daily, weekly, monthly and annual salary figures.
Open calculatorInterest Calculator
Calculate simple interest earned or owed on a principal amount.
Open calculatorInflation Calculator
See how inflation affects purchasing power over time.
Open calculatorBreak-Even Calculator
Determine how many units you need to sell to cover your fixed and variable costs.
Open calculatorProfit Calculator
Calculate gross profit and net profit from revenue and costs.
Open calculatorAmortization Calculator
Calculate loan amortization schedule with monthly payment breakdown.
Open calculatorAPR Calculator
Calculate the annual percentage rate (APR) for a loan including fees.
Open calculatorAuto Loan Calculator
Calculate your monthly car payment including taxes and down payment.
Open calculatorCD Calculator
Calculate the maturity value of a certificate of deposit (CD) investment.
Open calculatorCredit Card Payoff Calculator
Calculate how long it will take to pay off a credit card balance.
Open calculatorDebt Payoff Calculator
Plan how quickly you can pay off your total debt with fixed monthly payments.
Open calculatorFuture Value Calculator
Calculate the future value of a present sum of money at a given interest rate.
Open calculatorPayback Period Calculator
Calculate how long it takes to recover an initial investment from annual cash flows.
Open calculatorPresent Value Calculator
Calculate the present value of a future sum discounted at a given rate.
Open calculatorSales Tax Calculator
Calculate the sales tax amount and total price including tax.
Open calculatorSavings Calculator
Calculate how long it will take to reach a savings goal with regular contributions.
Open calculatorSimple Interest Calculator
Calculate simple interest on a principal amount over a set time period.
Open calculatorStudent Loan Calculator
Calculate monthly student loan payments and total repayment cost.
Open calculatorVAT Calculator
Calculate Value Added Tax on a price and find the VAT-inclusive total.
Open calculatorCommission Calculator
Calculate commission earnings from a sales amount and commission rate.
Open calculatorDepreciation Calculator
Calculate straight-line depreciation of an asset over its useful life.
Open calculatorBudget Calculator
Track your monthly budget by comparing income against expenses.
Open calculatorAnnuity Calculator
Calculate the future value of an annuity with regular payments.
Open calculatorAnnuity Payout Calculator
Calculate the periodic payout from an annuity given a principal sum.
Open calculatorBond Calculator
Calculate bond yield and current value from face value, coupon and market price.
Open calculatorCurrency Converter
Convert an amount from one currency to another using an exchange rate.
Open calculatorRetirement Savings Calculator
Project your retirement savings balance based on current savings and contributions.
Open calculatorDebt-to-Income Ratio Calculator
Calculate your debt-to-income ratio from monthly debt payments and income.
Open calculatorMortgage Payoff Calculator
Calculate how extra payments can shorten your mortgage term and save interest.
Open calculatorTake Home Pay Calculator
Estimate your net pay after taxes and deductions from your annual salary.
Open calculatorPayment Calculator
Calculate the fixed monthly payment for any amortizing loan.
Open calculatorHouse Affordability Calculator
Estimate how much house you can afford based on income and debts.
Open calculatorRent Calculator
Evaluate if your rent is affordable relative to your income.
Open calculatorDebt Consolidation Calculator
See if consolidating your debt at a lower rate saves you money.
Open calculatorRepayment Calculator
Calculate how long it takes to repay a loan with fixed monthly payments.
Open calculatorCollege Cost Calculator
Project the future cost of college education including inflation.
Open calculatorMutual Fund Calculator
Project the growth of a mutual fund investment with regular contributions.
Open calculatorRoth IRA Calculator
Project the future value of your Roth IRA with annual contributions.
Open calculatorIRA Calculator
Project the future value of a Traditional IRA with annual contributions.
Open calculatorCash Back or Low Interest Calculator
Compare cash back versus low-interest financing for a car purchase.
Open calculatorAuto Lease Calculator
Calculate the monthly lease payment for a vehicle.
Open calculatorAverage Return Calculator
Calculate the average annual return of an investment over multiple years.
Open calculatorBusiness Loan Calculator
Calculate monthly payments for a business loan.
Open calculatorPersonal Loan Calculator
Calculate the monthly payment and total cost of a personal loan.
Open calculatorBoat Loan Calculator
Calculate monthly payments for a boat loan or marine financing.
Open calculatorRefinance Calculator
Evaluate whether refinancing a loan at a lower rate will save you money.
Open calculatorRental Property Calculator
Analyze the cash flow and return on a rental property investment.
Open calculatorIRR Calculator
Estimate the internal rate of return for a series of cash flows.
Open calculatorFHA Loan Calculator
Calculate monthly payments for an FHA loan including MIP.
Open calculatorHELOC Calculator
Calculate available home equity and HELOC borrowing power.
Open calculator26 focused tools
Health Calculators
26 focused tools
BMI Calculator
Calculate your Body Mass Index from your height and weight.
Open calculatorBMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at rest.
Open calculatorTDEE Calculator
Calculate your Total Daily Energy Expenditure based on your BMR and activity level.
Open calculatorCalorie Calculator
Estimate daily calorie needs for weight loss, maintenance or gain based on your goals.
Open calculatorBody Fat Calculator
Estimate your body fat percentage using the US Navy method.
Open calculatorIdeal Weight Calculator
Find your ideal weight range based on height, gender and common formulas.
Open calculatorWater Intake Calculator
Calculate your recommended daily water intake based on weight and activity level.
Open calculatorPregnancy Calculator
Calculate your estimated due date and current pregnancy week from your last period.
Open calculatorSleep Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles.
Open calculatorPace Calculator
Calculate your running or walking pace, speed and split times.
Open calculatorBAC Calculator
Estimate your blood alcohol concentration based on weight, gender and drinks consumed.
Open calculatorBody Surface Area Calculator
Calculate body surface area using the Mosteller formula.
Open calculatorCalories Burned Calculator
Estimate calories burned during physical activity based on weight and duration.
Open calculatorCarbohydrate Calculator
Calculate your daily carbohydrate intake target based on total calories.
Open calculatorConception Calculator
Estimate your conception date and fertile window from your last period.
Open calculatorDue Date Calculator
Calculate your estimated pregnancy due date from your last period.
Open calculatorGFR Calculator
Estimate glomerular filtration rate to assess kidney function.
Open calculatorLean Body Mass Calculator
Estimate your lean body mass — total body weight minus fat mass.
Open calculatorMacro Calculator
Calculate your daily macronutrient targets in grams from total calories.
Open calculatorProtein Calculator
Calculate your recommended daily protein intake based on weight and activity.
Open calculatorArmy Body Fat Calculator
Estimate body fat percentage using the U.S. Army circumference method.
Open calculatorPregnancy Weight Gain Calculator
Estimate recommended weight gain during pregnancy based on pre-pregnancy BMI.
Open calculatorHealthy Weight Calculator
Find a healthy weight range for your height based on BMI guidelines.
Open calculatorOne Rep Max Calculator
Estimate your one-repetition maximum lift from sub-maximal reps.
Open calculatorFat Intake Calculator
Calculate your recommended daily fat intake in grams from total calories.
Open calculatorBody Type Calculator
Determine your body type (ectomorph, mesomorph, endomorph) from measurements.
Open calculator32 focused tools
Math Calculators
32 focused tools
Average Calculator
Calculate the arithmetic mean of a set of numbers.
Open calculatorStandard Deviation Calculator
Calculate the standard deviation and variance of a set of numbers.
Open calculatorArea Calculator
Calculate the area of common geometric shapes.
Open calculatorBinary Calculator
Convert a decimal number to its binary representation.
Open calculatorCircle Calculator
Calculate a circle's area, circumference and diameter from its radius.
Open calculatorDistance Calculator
Calculate the straight-line distance between two points in a plane.
Open calculatorExponent Calculator
Raise a base number to any exponent power.
Open calculatorHalf-Life Calculator
Calculate remaining quantity after radioactive decay or exponential decrease.
Open calculatorHex Calculator
Convert a decimal number to its hexadecimal representation.
Open calculatorLog Calculator
Calculate the logarithm of a number with any base.
Open calculatorProbability Calculator
Calculate the probability of an event from favorable and total outcomes.
Open calculatorQuadratic Formula Calculator
Solve quadratic equations of the form ax² + bx + c = 0.
Open calculatorGCF Calculator
Find the greatest common factor of two numbers.
Open calculatorLCM Calculator
Find the least common multiple of two numbers.
Open calculatorMean Median Mode Calculator
Calculate the mean, median and mode of a set of five numbers.
Open calculatorNumber Sequence Calculator
Generate an arithmetic sequence from a starting value and common difference.
Open calculatorPermutation Combination Calculator
Calculate permutations (nPr) and combinations (nCr) for given n and r.
Open calculatorPythagorean Theorem Calculator
Find the hypotenuse or missing leg of a right triangle.
Open calculatorRatio Calculator
Simplify a ratio and express it in its simplest form.
Open calculatorRight Triangle Calculator
Calculate all sides and angles of a right triangle from two known sides.
Open calculatorRoot Calculator
Calculate any root of a number (square root, cube root, or nth root).
Open calculatorRounding Calculator
Round a number to a specified number of decimal places.
Open calculatorScientific Notation Calculator
Convert a number to and from scientific notation.
Open calculatorSlope Calculator
Calculate the slope of a line passing through two points.
Open calculatorTriangle Calculator
Calculate the area and perimeter of a triangle from its three sides.
Open calculatorVolume Calculator
Calculate the volume of common 3D shapes.
Open calculatorSample Size Calculator
Calculate the minimum sample size needed for a survey or study.
Open calculatorStatistics Calculator
Calculate comprehensive statistics for a set of eight numbers.
Open calculatorConfidence Interval Calculator
Calculate the confidence interval for a population mean.
Open calculatorZ-Score Calculator
Calculate the z-score (standard score) of a value in a distribution.
Open calculatorSurface Area Calculator
Calculate the surface area of common 3D shapes.
Open calculatorFactor Calculator
Find all factors of a given integer.
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Other Calculators
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Day Counter
Count the number of days between two dates.
Open calculatorFuel Cost Calculator
Calculate the total fuel cost for a trip based on distance and efficiency.
Open calculatorGas Mileage Calculator
Calculate your vehicle's fuel efficiency from distance traveled and fuel used.
Open calculatorGPA Calculator
Calculate your Grade Point Average from up to 5 courses.
Open calculatorGrade Calculator
Calculate a grade as a percentage from points scored and total points.
Open calculatorHours Calculator
Calculate the time difference between two clock times.
Open calculatorSpeed Calculator
Calculate average speed from distance and time.
Open calculatorConcrete Calculator
Calculate the volume of concrete needed for a rectangular slab.
Open calculatorFraction Calculator
Add, subtract, multiply or divide two fractions.
Open calculatorRandom Number Generator
Generate a random number within a specified range.
Open calculatorPrime Factorization Calculator
Break down a number into its prime factors.
Open calculatorP-Value Calculator
Convert a z-score to a two-tailed p-value for hypothesis testing.
Open calculatorTime Calculator
Add or subtract two time values in hours, minutes and seconds.
Open calculatorTime Card Calculator
Calculate work hours from clock-in and clock-out times with break deduction.
Open calculatorTime Duration Calculator
Convert total seconds into hours, minutes and seconds.
Open calculatorDay of Week Calculator
Find the day of the week for any given date.
Open calculatorHeight Calculator
Convert height between centimeters, meters, feet and inches.
Open calculatorBTU Calculator
Estimate the BTUs needed to heat or cool a room.
Open calculatorSquare Footage Calculator
Calculate the area of a rectangular space in square feet or square meters.
Open calculatorVoltage Drop Calculator
Calculate voltage drop in an electrical circuit.
Open calculatorResistor Calculator
Calculate resistor value from 4-band color codes.
Open calculatorElectricity Calculator
Calculate electricity consumption and monthly cost for an appliance.
Open calculatorDensity Calculator
Calculate the density of an object from its mass and volume.
Open calculatorMass Calculator
Convert mass between kilograms, grams, pounds and ounces.
Open calculatorMolarity Calculator
Calculate the molarity of a solution from solute mass, molar mass and volume.
Open calculatorWind Chill Calculator
Calculate the felt air temperature considering wind speed.
Open calculatorHeat Index Calculator
Calculate the heat index (feels-like temperature) from temperature and humidity.
Open calculatorDew Point Calculator
Calculate the dew point temperature from air temperature and humidity.
Open calculatorHorsepower Calculator
Calculate engine horsepower from torque and RPM.
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