🧮 Math, dates and units
Calculators and converters for everyday maths: percentages, fractions, equations, ages, dates, time zones, units and more. Most update as you type and none needs a signup.
Percentage calculatorWork out a percentage of a number, what percent one number is of
another, or the percent change between two values.Age calculatorFind an exact age in years, months and days, the total days
lived, and the days until the next birthday.Days between datesCount the days, weeks and weekdays between two dates, and see the
difference in years, months and days.Unit converterConvert between common units of length, weight, volume, area,
speed, time and temperature.Kilograms to poundsConvert kilograms to pounds instantly.Centimeters to inchesConvert centimeters to inches instantly.Celsius to FahrenheitConvert temperatures from Celsius to Fahrenheit instantly.Miles to kilometersConvert miles to kilometers instantly.Random number generatorDraw random whole numbers in any range, with or without
repeats.BMI calculatorCalculate body mass index from height and weight in metric or
imperial units.Date calculatorFind the date that is a number of days, weeks, months or years
before or after another date.Average calculatorFind the mean, median, mode, range and standard deviation of a
list of numbers.Time zone converterConvert a date and time between any two time zones, with a world
clock for major cities.Roman numeral converterConvert numbers to Roman numerals and Roman numerals back to
numbers.Scientific calculatorEvaluate expressions with brackets, powers and functions such as
sin, log and sqrt.Fraction calculatorAdd, subtract, multiply and divide fractions and mixed numbers,
with simplified results.Prime number checkerCheck whether a number is prime and see its prime factors and the
nearest primes.Equation solverSolve linear and quadratic equations and see the discriminant and
roots.GPA calculatorCalculate your grade point average from letter grades and credit
hours.Length converterConvert between meters, feet, inches, yards, miles, kilometers
and more.Weight converterConvert between kilograms, grams, pounds, ounces and
stone.Temperature converterConvert between Celsius, Fahrenheit and Kelvin.Data storage converterConvert between bytes, kilobytes, megabytes, gigabytes, terabytes
and the binary units.Percentage change calculatorCalculate the percentage increase or decrease from an old value
to a new value.