Numbers Tools

Convert binary numbers to decimal instantly, with the place-value breakdown shown.

Convert decimal numbers to binary instantly, with the division steps shown.

Convert hexadecimal numbers to decimal instantly, with the digit breakdown shown.

Convert decimal numbers to hexadecimal instantly and copy the result.

Convert numbers between any bases from 2 to 36: binary, octal, decimal, hex and beyond.

Convert numbers to Roman numerals and Roman numerals back to numbers (1 to 3,999,999).

Spell out any number in English words - great for checks and legal documents.

Round numbers to any decimal place, significant figures, or the nearest ten, hundred or thousand.

Convert numbers to and from scientific notation and E notation.

Sort a list of numbers in ascending or descending order, with duplicates removed if you want.

Calculate the sum of digits of a number, including the repeated (iterated) digit sum.

Convert numbers to ordinals (1 → 1st, 2 → 2nd) and spell them out in words.

Convert any fraction to a decimal, with repeating decimals detected and shown.

Convert decimals to simplified fractions, including repeating decimals.