Math & percentages

Percentages, proportions, averages, random numbers, number bases and other everyday calculations.

10 tools

• Percentage calculator

  What is X% of a number? Enter the percentage and the number to get the answer instantly.

• Percent of total calculator

  Find what percentage one number is of another — for example, 30 is 20% of 150.

• Percentage change calculator

  Find the percentage increase or decrease between an old and a new value — prices, salaries, rates or any other numbers.

• Percent increase and decrease calculator

  Add a percentage to a number or subtract it — for example, 1,000 + 20% = 1,200 and 1,000 − 20% = 800.

• Proportion calculator

  Solve for X in a proportion: if A corresponds to B, what does C correspond to? Works for direct and inverse proportions.

• Average calculator

  Calculate the mean, median, mode, sum, minimum and maximum of any list of numbers.

• Random number generator

  Generate one or more random numbers in a range, with or without repeats — for draws, giveaways and games.

• Number base converter

  Convert whole numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36.

• Fraction calculator

  Add, subtract, multiply and divide fractions with the result simplified — as a fraction, a mixed number and a decimal.

• Roman numeral converter

  Convert numbers to Roman numerals and Roman numerals to numbers, from 1 to 3,999.