Calculators
Finance, health, geometry, and the everyday maths — instant answers.
53 tools
BMI CalculatorWork out your Body Mass Index from height and weight — instantly, in your browser.Auto Loan CalculatorEstimate your monthly car payment, total cost and interest from the loan terms.Debt Payoff CalculatorFind how many months it takes to clear a debt from its balance, APR and payment.GST CalculatorAdd or remove GST at any rate — net, GST and gross side by side.Hourly to Salary CalculatorConvert any hourly rate into a full-time annual salary, plus monthly and weekly pay.Income Tax CalculatorEstimate income tax and take-home pay from your income and a flat tax rate.Inflation CalculatorSee how much a sum will be worth in the future at a given inflation rate.Loan CalculatorEstimate the monthly payment on a loan from amount, rate and term.Margin CalculatorFind profit margin and markup percentages from a selling price and unit cost.Mortgage CalculatorEstimate your monthly mortgage payment from the loan amount, interest rate and term.Retirement CalculatorProject your retirement nest egg from a starting balance and monthly contributions.ROI CalculatorCalculate return on investment as a percentage from your cost and final value.Salary CalculatorTurn an hourly wage into annual, monthly and weekly pay — instantly, in your browser.Savings CalculatorProject the future value of regular monthly deposits plus a starting balance with compound interest.VAT CalculatorAdd VAT to a net price or strip VAT out of a gross price at any rate.Percent Change CalculatorCalculate the percentage increase or decrease between two numbers.Percentage CalculatorWhat is X% of Y? Get the answer as you type — no sign-up, no ads in the way.Sales Tax CalculatorAdd sales tax to any amount and see the total — pick any rate.Sample Size CalculatorFind how many responses a survey needs for a chosen confidence level and margin of error.APY CalculatorConvert a nominal interest rate into the effective annual yield (APY).Capital Gains Tax CalculatorEstimate the tax on a capital gain from your buy price, sell price and rate.Compound Interest CalculatorSee how an investment grows with compound interest over time.Down Payment CalculatorWork out your down payment and remaining loan amount from a home price and percentage.Self-Employment Tax CalculatorEstimate the 15.3% self-employment tax on your net business earnings.Average CalculatorAdd up a list of numbers and divide by the count to find the average (mean) instantly.BMR CalculatorEstimate your basal metabolic rate — the calories your body burns at rest.Body Fat CalculatorEstimate your body fat percentage from weight, height and age using the BMI method.Calorie Calculator (TDEE)Estimate your daily calorie needs (TDEE) from your body stats and activity level.Descriptive Statistics CalculatorPaste a list of numbers to get the mean, median, mode, range, variance and standard deviation at once.Discount CalculatorSee the sale price and how much you save from any percentage off.One Rep Max CalculatorEstimate your one-rep max (1RM) from the weight and reps of a working set.Pace CalculatorWork out your running pace and speed from a distance and a finish time.Paycheck CalculatorEstimate your take-home pay per year and per paycheck from your gross salary and tax rate.Percent Error CalculatorCompare an experimental measurement to the true value as a percentage error.Probability CalculatorTurn favorable outcomes over total outcomes into a probability and percentage.Standard Deviation CalculatorFind the standard deviation and variance of a list of numbers, with every step shown.Tip CalculatorSplit the tip without the awkward maths. Enter the bill and tip percentage.Water Intake CalculatorEstimate how much water to drink each day based on your body weight.Z-Score CalculatorFind how many standard deviations a value sits from the mean.Circle CalculatorGet the area and circumference of a circle from its radius — instantly, in your browser.Square Footage CalculatorWork out the square footage of a room or area from its length and width in feet.Ideal Weight CalculatorEstimate your ideal body weight from your height using the Devine formula.Macro CalculatorConvert a daily calorie target and protein percentage into grams of protein.Cone Volume CalculatorFind the volume of a cone from its base radius and height.Cube Volume CalculatorCalculate the volume and surface area of a cube from its edge length.Cylinder Volume CalculatorFind the volume and surface area of a cylinder from its radius and height.Pythagorean Theorem CalculatorSolve for the hypotenuse from the two legs using the Pythagorean theorem.Rectangle Area CalculatorFind the area and perimeter of a rectangle from its length and width.Rectangular Prism Volume CalculatorFind the volume and surface area of a box from its length, width and height.Right Triangle CalculatorFind the hypotenuse and area of a right triangle from its two legs.Sphere Volume CalculatorCalculate the volume and surface area of a sphere from its radius.Trapezoid Area CalculatorCalculate the area of a trapezoid from its two parallel sides and height.Triangle Area CalculatorCalculate the area of a triangle from its base and height.