Calculators

Calculate date differences or add days, weeks, months and years.

Convert length, mass, temperature and nine other unit categories.

Add, subtract, multiply and divide fractions exactly.

Convert currencies using the latest available reference exchange rate.

Generate cryptographically random integers with exact large bounds, optional uniqueness and sorting.

Calculate arithmetic expressions, powers, factorials and scientific functions locally.

Convert exact Arabic numbers, Chinese numerals and RMB amount text without rounding.