Math & Conversion
Calculators, statistics, number bases and unit converters.
Ready to use
- Scientific Calculator A full scientific calculator with trigonometry, logs, powers, factorials, history and keyboard input.
- Percentage Calculator Percent of a number, percentage change and difference, increases, discounts and reverse percentages.
- Fraction Calculator Add, subtract, multiply and divide fractions and mixed numbers, simplify them and convert decimals to fractions.
- Ratio & Proportion Calculator Simplify ratios, solve proportions such as a:b = c:x, and divide an amount in a given ratio.
- Statistics Calculator Mean, median, mode, standard deviation, variance, quartiles and more for a list of numbers.
- Prime Number Checker Check whether a number is prime, see its prime factors, and list the primes in a range.
- GCD & LCM Calculator Find the greatest common divisor (HCF) and least common multiple of two or more numbers, with steps.
- Factorial Calculator Exact factorials up to 10,000! with digit counts, trailing zeros and scientific notation.
- Random Number Generator Fair random whole numbers or decimals in any range, with no-repeat and sort options.
- Number Base Converter Convert between binary, octal, decimal, hexadecimal and any base from 2 to 36.
- Roman Numeral Converter Convert numbers to Roman numerals and back, with checks for correctly written numerals.
- Unit Converter Convert length, weight, temperature, area, volume, speed, time, data, pressure and energy units.