Hexadecimal to Decimal Converter
Convert hexadecimal (base-16) numbers to decimal (base-10).
Try an example:
- Binary (2)
11111111- Octal (8)
377- Decimal (10)
255- Hexadecimal (16)
ff
Converting Hexadecimal to Decimal
Converting hex to decimal turns compact base-16 values — like color codes or byte values — back into ordinary numbers.
How to convert Hexadecimal to Decimal by hand
- Write the place value (1, 16, 256, …) under each hex digit, from the right.
- Convert the letters A–F to 10–15.
- Multiply each digit by its place value and add the results.
Worked example
FF (hex) → 255 (decimal) — 15×16 + 15 = 255.
More converters
- Decimal to Binary
- Binary to Decimal
- Decimal to Hexadecimal
- Binary to Hexadecimal
- Hexadecimal to Binary
- Decimal to Octal
Frequently asked questions
How do I convert Hexadecimal to Decimal?
Write the place value (1, 16, 256, …) under each hex digit, from the right. Convert the letters A–F to 10–15. Multiply each digit by its place value and add the results. Or just use the converter on this page — it does it instantly. Example: FF (hex) becomes 255 (decimal).
What is FF (hex) in decimal?
FF (hex) converts to 255 (decimal). 15×16 + 15 = 255.
Is this converter free and private?
Yes — it is free and unlimited, and the conversion runs entirely in your browser, so nothing is uploaded to a server.