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Number Base Converter

Convert a decimal number to binary, octal, and hexadecimal.

Decimal number

How it works

Repeatedly divide the number by the target base and read the remainders in reverse. Example: 255 is 11111111 in binary, 377 in octal, and FF in hexadecimal. Only non-negative whole numbers are supported.

FAQ

Is this calculator free?

Yes. No signup is needed and nothing you enter is stored.

Is the result exact?

Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.

Do my numbers leave my device?

No. The calculation runs in your browser.