Calculator directory
Every calculator on the site, with the formula, a worked example and an explanation of what the result actually means. 40 tools and counting.
Popular calculators
- Health & FitnessBMI CalculatorBody Mass Index from height and weight, with the WHO category.
- Health & FitnessCalorie CalculatorDaily calorie needs (TDEE) for maintaining, losing or gaining weight.
- Finance & MoneyCompound Interest CalculatorGrowth of savings or debt when interest earns interest, with optional deposits.
- Finance & MoneyDiscount CalculatorSale price and savings from one or two stacked discounts.
- Finance & MoneyGST / Sales Tax CalculatorAdd or remove GST, VAT or sales tax at any rate.
- Finance & MoneyLoan CalculatorMonthly repayment, total interest and total cost for any amortising loan.
- Finance & MoneyMortgage CalculatorMonthly mortgage payment including tax and insurance, with total interest.
- Finance & MoneyPayment CalculatorSolve for the payment, or for the term a fixed payment implies.
- MathematicsPercentage CalculatorEvery common percentage question in one tool.
Recently added
- MathematicsRandom Number GeneratorRandom integers in any range, with optional uniqueness.
- Health & FitnessRunning Pace CalculatorPace, time or distance for runs — solve for whichever you're missing.
- MathematicsExponent & Logarithm CalculatorPowers, plus logarithms to any base.
- MathematicsGCD & LCM CalculatorGreatest common divisor and lowest common multiple of any set of integers.
- MathematicsPrime Number CalculatorTest whether a number is prime and see its full factorisation.
- MathematicsQuadratic Equation CalculatorRoots, discriminant and vertex for ax² + bx + c = 0.
- MathematicsSquare Root & Root CalculatorSquare roots, cube roots and any nth root, plus squares.
- Health & FitnessMacro CalculatorSplit daily calories into protein, carbohydrate and fat targets.
Browse alphabetically
A
B
C
E
G
H
I
M
P
- Finance & MoneyPayment CalculatorSolve for the payment, or for the term a fixed payment implies.
- MathematicsPercentage CalculatorEvery common percentage question in one tool.
- MathematicsPrime Number CalculatorTest whether a number is prime and see its full factorisation.
- Finance & MoneyProfit Margin CalculatorGross margin, profit and the markup it corresponds to.
- Health & FitnessProtein CalculatorDaily protein target based on body weight and training goal.
R
- MathematicsRandom Number GeneratorRandom integers in any range, with optional uniqueness.
- MathematicsRatio CalculatorSimplify ratios, scale them, and solve for a missing term.
- Finance & MoneyRent Affordability CalculatorHow much rent your income comfortably supports, on three common rules.
- Finance & MoneyRetirement CalculatorProjected retirement pot and the income it could support.
- Finance & MoneyROI CalculatorReturn on investment as a percentage, plus annualised return.
- Health & FitnessRunning Pace CalculatorPace, time or distance for runs — solve for whichever you're missing.
S
- Finance & MoneySalary CalculatorConvert between hourly, weekly, monthly and annual pay.
- Finance & MoneySavings Goal CalculatorHow much to save each month to reach a target by a chosen date.
- Finance & MoneySimple Interest CalculatorInterest earned or owed on a fixed principal, with no compounding.
- Finance & MoneySplit Bill CalculatorSplit a bill evenly or by individual spend, with tip and service charge.
- MathematicsSquare Root & Root CalculatorSquare roots, cube roots and any nth root, plus squares.
- MathematicsStandard Deviation CalculatorPopulation and sample standard deviation, variance and mean.