Math & numbers
Percentages, fractions, ratios and other everyday number problems, worked out step by step so you can follow and check the answer.
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Utilities
- A/B test significance calculatorConversion rates, lift, p-value and the confidence interval of an A/B test, with the sample size it needs., private, runs on your deviceMoney & financeCalculatorStatistics
- Angle converterConvert between degrees, radians, gradians, arcminutes, arcseconds, turns and mils., private, runs on your deviceUnit conversionConverterGeometry
- Area converterConvert between square metres, hectares, acres, square feet, square miles and more, exactly., private, runs on your deviceUnit conversionConverterAreaMetricImperial
- Area of shapesArea and perimeter of rectangles, circles, triangles and eight more shapes, drawn to scale., private, runs on your deviceCalculatorGeometryAreaMetricImperial
- Average calculatorMean, median, mode and range of a list of numbers, with the count, sum, smallest and largest., private, runs on your deviceCalculatorStatistics
- Combinations and permutations calculatorExact counts of combinations and permutations, with or without repetition, and the chance of one particular pick., private, runs on your deviceCalculatorStatistics
- Confidence interval calculatorThe confidence interval for a mean or a proportion from a sample, with the margin of error and the method used., private, runs on your deviceCalculatorStatistics
- E-series preferred valuesFind the nearest E3 to E192 value to the one you need, with its neighbours and error., private, runs on your deviceElectronics & cablingCalculator
- Fraction calculatorAdd, subtract, multiply and divide fractions and mixed numbers, or turn a decimal into a fraction, with the answer in lowest terms., private, runs on your deviceCalculator
- GCD and LCM calculatorThe greatest common divisor and the least common multiple of two to ten whole numbers, with the Euclidean steps., private, runs on your deviceCalculatorReference
- Logic gatesSwitch the inputs and see each logic gate's output at once, with its symbol in both standard styles, its Boolean expression and truth table., private, runs on your deviceElectronics & cablingReferenceEncoding
- Number base converterConvert whole numbers between binary, octal, decimal, hexadecimal and any base up to 36., private, runs on your deviceConverterCalculator
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- Percentage calculatorPercent of a number, what percent one number is of another, percentage change and difference, and the number before a discount., private, runs on your deviceCalculatorCostsStatistics
- Prime number checkerTest any whole number up to 100 digits for primality, with its prime factors and the next and previous prime., private, runs on your deviceCalculatorChecker
- Ratio calculatorSimplify a ratio to its lowest terms, or find the missing number in an equal ratio, the rule of three., private, runs on your deviceCalculator
- Roman numeral converterTurn a number into Roman numerals, or Roman numerals into a number, in the standard form from 1 to 3999., private, runs on your deviceUnit conversionConverterCalculator
- Sample size calculatorThe number of survey responses you need for a margin of error and confidence level, for any population size., private, runs on your deviceCalculatorStatistics
- Scientific calculatorType a calculation or use the keys., private, runs on your deviceCalculator
- Scientific notation converterWrite a number in scientific and engineering notation with the significant figures you choose, or turn 6.022e23 back into digits., private, runs on your deviceCalculator
- Standard deviation calculatorSample or population standard deviation and variance of a list of numbers, with the mean and the standard error., private, runs on your deviceCalculatorStatistics
- Triangle solverGive three parts of a triangle and get the other three, its area and a drawing to scale, including the case with two answers., private, runs on your deviceCalculatorGeometryLength
- Volume converterConvert between millilitres, litres, cubic metres, US gallons and imperial gallons, exactly., private, runs on your deviceUnit conversionConverterVolume & capacityMetricImperial
- Volume of solidsVolume and surface area of boxes, cylinders, spheres, cones and seven more solids, in litres and gallons too., private, runs on your deviceCalculatorGeometryVolume & capacityMetricImperial
- z-score calculatorThe z-score and percentile of a value on a normal distribution, the value at a percentile, or the chance between two values., private, runs on your deviceCalculatorStatistics
Each tool shows the method as well as the answer, so you can check homework, prices or a recipe yourself. No accounts. No input tracking.
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