All Calculators
24 free online calculators, each with step-by-step working. Every figure is verified against our engine before each build.
Math13 calculatorsAlgebra, arithmetic, fractions, and core maths tools.Science1 calculatorScientific notation, unit conversions, and lab helpers.Finance1 calculatorCompound interest and investment growth calculations.Health2 calculatorsBMI, calorie, and fitness calculators.Time & Date3 calculatorsAge, duration, and hours/pay calculators.Converters4 calculatorsLength, weight, temperature, and number-base converters.
All calculators
- PercentageFind a percentage of a number, work out what percentage one number is of another, or calculate percentage change.
- FractionAdd, subtract, multiply and divide fractions with exact results, automatically reduced to lowest terms.
- ExponentRaise any number to any power, take nth roots, and solve for an unknown exponent.
- LogarithmBase-10, base-2 and any-base logarithms, plus antilogs, with the log laws and a reference table.
- Natural logCalculate ln(x) and its inverse eˣ, and see why the number e turns up wherever things grow continuously.
- FactorialCompute n!, permutations (nPr) and combinations (nCr), with a factorial table and the counting logic behind each.
- Scientific notationConvert between ordinary decimals and scientific notation in both directions, with the rules for significant figures.
- StatisticsMean, median, mode, range, variance and standard deviation from a list of numbers, with both sample and population forms.
- AverageA fast everyday mean/median/mode/range check for a short list of numbers - quiz scores, weekly readings, a handful of measurements.
- RatioSimplify ratios, find equivalent ratios, and convert between ratios and fractions.
- Square rootCalculate square roots, cube roots, and nth roots of any number.
- DerivativeFind the derivative of polynomials and basic functions with step-by-step power rule solutions.
- IntegralFind the indefinite and definite integral of polynomials using the reverse power rule.
- LimitEvaluate limits of functions as x approaches a value, including one-sided limits.
- BMICalculate your Body Mass Index from weight and height, with category interpretation.
- CalorieEstimate daily calorie needs based on age, weight, height, and activity level.
- Compound interestCalculate compound interest, future value, and the effect of regular contributions.
- AgeCalculate your exact age in years, months, and days from your date of birth.
- TimeAdd, subtract, and convert between hours, minutes, and seconds.
- HoursCalculate total hours and pay from hourly rate and hours worked.
- LengthConvert between metres, kilometres, miles, feet, inches, centimetres, and more.
- WeightConvert between kilograms, pounds, ounces, grams, and stones.
- TemperatureConvert between Celsius, Fahrenheit, and Kelvin.
- Number baseConvert between decimal, binary, octal, and hexadecimal number systems.