What characters are valid for each base?

Binary allows only 0-1, octal 0-7, decimal 0-9, and hexadecimal 0-9 plus A-F (case-insensitive). Entering a digit outside the valid range for the selected base — like an '8' in an octal number — will produce an error.

Is there a limit to how large a number I can convert?

Numbers are converted using standard JavaScript integer math, which is exact up to 2^53 − 1 (about 9 quadrillion in decimal, or 15 hex digits). Larger values may lose precision.

Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal.

How this is calculated

Parses the input in its source base to a decimal integer, then re-encodes it in each target base

Assumptions used in this calculation

Integer precision: Conversions use JavaScript's native number type, accurate up to 2^53 − 1; larger values may lose precision.

About this calculator

The number base converter converts a number from binary, octal, decimal or hexadecimal into all four bases at once.

Worked example

255 (decimal)

Result: Binary 11111111, Hex FF

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Frequently asked questions

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Convert numbers to Roman numerals and back.

Number Base Converter

About this calculator

Frequently asked questions

What characters are valid for each base?

Is there a limit to how large a number I can convert?

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