CALCULATOR DIRECTORY
Everyday calculators,
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Search by topic or name. Every tool is free, fast, and built to make the next decision easier.
77 calculators
Salary to Hourly Calculator
Convert an annual salary into an hourly pay estimate.
Open calculator →moneyHourly to Salary Calculator
See weekly, monthly, and annual pay from an hourly rate.
Open calculator →moneyOvertime Calculator
Estimate overtime pay at your agreed multiplier.
Open calculator →moneyTip Calculator
Calculate a tip and a fair per-person total.
Open calculator →moneyDiscount Calculator
Find the sale price and savings from a percentage discount.
Open calculator →moneyProfit Margin Calculator
Calculate profit and profit margin from revenue and costs.
Open calculator →moneyMarkup Calculator
Turn a cost and markup percentage into a selling price.
Open calculator →moneyCommission Calculator
Estimate commission based on sales and a percentage rate.
Open calculator →moneyLoan Payment Calculator
Estimate a fixed monthly loan payment, excluding taxes and insurance.
Open calculator →moneySimple Interest Calculator
Calculate simple interest and total value.
Open calculator →moneyCompound Interest Calculator
Estimate compounded growth with annual compounding.
Open calculator →moneySales Tax Calculator
Calculate sales tax and the final purchase price.
Open calculator →moneySavings Goal Calculator
Find the monthly amount needed to reach a savings goal.
Open calculator →moneyDebt-to-Income Calculator
Estimate your debt-to-income ratio from monthly amounts.
Open calculator →moneyAnnual Income Calculator
Estimate your yearly, monthly, and weekly income from an hourly rate.
Open calculator →moneyMortgage Calculator
Estimate a monthly principal-and-interest mortgage payment.
Open calculator →moneyAuto Loan Calculator
Estimate a monthly auto loan payment and total interest.
Open calculator →moneyFuture Value Calculator
Estimate how much a lump-sum investment could grow over time.
Open calculator →moneyPresent Value Calculator
Find the current value of a future amount using a discount rate.
Open calculator →moneyRetirement Calculator
Estimate retirement savings from a starting balance and monthly contributions.
Open calculator →moneyInflation Calculator
Estimate the future cost of today’s money after inflation.
Open calculator →moneyCredit Card Payoff Calculator
Estimate the months and interest needed to pay off a credit card balance.
Open calculator →moneyBudget Calculator
See how monthly spending and savings compare with income.
Open calculator →moneyVAT Calculator
Calculate VAT and the price including VAT.
Open calculator →percentagePercentage Calculator
Find what percentage one number is of another.
Open calculator →percentageWhat Is X% of Y?
Calculate a percentage of any number.
Open calculator →percentagePercentage Increase Calculator
Measure a percentage increase or decrease between two values.
Open calculator →percentagePercentage Difference Calculator
Compare two values using their average as the reference.
Open calculator →percentageReverse Percentage Calculator
Find the original value before a percentage reduction or increase.
Open calculator →mathTest Grade Calculator
Calculate a percentage score and an estimated letter grade from total and incorrect answers.
Open calculator →mathGrade Calculator
Calculate a current grade from any number of assignments, then estimate the final-exam score needed to reach your target.
Open calculator →time dateBirth Year Calculator
Estimate a birth year from a person’s current age and the current year.
Open calculator →conversionsFeet to Centimeters
Convert feet to centimeters.
Open calculator →conversionsCentimeters to Feet
Convert centimeters to feet.
Open calculator →conversionsInches to Centimeters
Convert inches to centimeters.
Open calculator →conversionsPounds to Kilograms
Convert pounds to kilograms.
Open calculator →conversionsKilograms to Pounds
Convert kilograms to pounds.
Open calculator →conversionsMiles to Kilometers
Convert miles to kilometers.
Open calculator →conversionsFahrenheit to Celsius
Convert Fahrenheit to Celsius.
Open calculator →conversionsCelsius to Fahrenheit
Convert Celsius to Fahrenheit.
Open calculator →health fitnessBMI Calculator
Estimate body mass index from height and weight.
Open calculator →health fitnessCalorie Calculator
Estimate daily energy needs using a simplified Mifflin-St Jeor baseline.
Open calculator →health fitnessRunning Pace Calculator
Calculate average running pace per kilometer.
Open calculator →health fitnessWater Intake Calculator
Estimate a daily water-intake target based on weight and exercise.
Open calculator →health fitnessBMR Calculator
Estimate basal metabolic rate using a simplified Mifflin-St Jeor baseline.
Open calculator →health fitnessIdeal Weight Calculator
Estimate an adult healthy-weight range using BMI values of 18.5 to 24.9.
Open calculator →health fitnessOne Rep Max Calculator
Estimate one-repetition maximum using the Epley formula.
Open calculator →health fitnessTarget Heart Rate Calculator
Estimate a training heart-rate target from age and intensity.
Open calculator →health fitnessBody Surface Area Calculator
Estimate body surface area with the Mosteller formula.
Open calculator →mathAverage Calculator
Find the arithmetic mean of three numbers.
Open calculator →mathRatio Calculator
Express two numbers as a simplified ratio.
Open calculator →mathExponent Calculator
Raise a number to a power.
Open calculator →mathSquare Root Calculator
Find the principal square root of a non-negative number.
Open calculator →mathVolume Calculator
Calculate the volume of a rectangular prism from its length, width, and height.
Open calculator →mathArea Calculator
Calculate the area of a rectangle from length and width.
Open calculator →mathMulch Calculator
Estimate mulch volume, bags, and material cost for a rectangular garden bed.
Open calculator →mathConcrete Calculator
Estimate ready-mix volume or 60 lb concrete bags for a rectangular slab.
Open calculator →mathPythagorean Theorem Calculator
Find the hypotenuse of a right triangle.
Open calculator →mathDistance Calculator
Calculate the straight-line distance between two coordinate points.
Open calculator →mathSlope Calculator
Find the slope between two coordinate points.
Open calculator →mathQuadratic Formula Calculator
Solve a quadratic equation in the form ax² + bx + c = 0.
Open calculator →mathPercent Error Calculator
Calculate the percent error between an observed and accepted value.
Open calculator →mathSpeed Calculator
Calculate average speed from distance and time.
Open calculator →mathDensity Calculator
Calculate density from mass and volume.
Open calculator →mathFraction Calculator
Convert a fraction to a decimal and percentage.
Open calculator →mathStandard Deviation Calculator
Calculate the population standard deviation of three values.
Open calculator →time dateDecimal Hours to Time Calculator
Convert decimal hours into hours and minutes.
Open calculator →businessBusiness Break-Even Calculator
Estimate how many sales your business needs to cover fixed costs.
Open calculator →businessROI Calculator
Calculate the return on investment as a percentage.
Open calculator →AI toolAI API Cost Calculator
Estimate API costs with centralized, clearly labelled example model pricing.
Open calculator →AI toolLLM Token Cost Calculator
Estimate the input and output cost of an LLM request.
Open calculator →AI toolAI Token Calculator
Estimate tokens from words; tokenization varies by model and language.
Open calculator →AI toolAI Chatbot Cost Calculator
Estimate monthly AI chatbot API spending.
Open calculator →AI toolAI SaaS Cost Calculator
Estimate costs, revenue, margin, and break-even for an AI product.
Open calculator →AI toolAI Product Break-Even Calculator
Find the customer count needed to cover fixed costs.
Open calculator →AI toolAI Image Generation Cost Calculator
Estimate image-generation spending; provider pricing varies.
Open calculator →AI toolAI Video Generation Cost Calculator
Estimate video-generation spending; provider pricing varies.
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