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Hex to Decimal Converter
Convert hexadecimal to decimal — and between binary, octal and hex.
Result
—
Converted value.
| Decimal | — |
|---|---|
| Hexadecimal | — |
| Binary | — |
| Octal | — |
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Enter your figures above to see the step-by-step working.
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How the Hex to Decimal Converter Works
Numbers can be written in different bases: binary (base 2, used by computers), octal (base 8), decimal (base 10, everyday numbers) and hexadecimal (base 16, common in programming and colours). Converting means re-expressing the same value in another base. This tool reads your value in its base, finds its plain decimal value, then rewrites it in the base you want — and shows all four at once.
Hexadecimal uses the digits 0–9 then A–F for 10–15, so FF is 255. Binary uses only 0 and 1. The underlying quantity never changes — only how it’s written.
value in base X → decimal → value in base Y
Frequently Asked Questions
What is FF in decimal?
255. Hexadecimal FF is 15×16 + 15 = 255.
How do I convert hex to decimal?
Multiply each digit by 16 raised to its position and add. The tool does it and shows binary and octal too.
Why is hexadecimal used?
It maps neatly to binary (each hex digit is 4 bits) and is compact, so it’s common in programming, memory addresses and colour codes.
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