Convert Hex to Decimal
Convert hexadecimal numbers to decimal.
Hex to Decimal Converter
Developer tool running locally in browser
What does Hex to Decimal Converter do?
Convert hexadecimal to decimal with the place-value working shown, accepting the 0x prefix and any capitalisation. Handles values far beyond 64 bits exactly.
How to Use Hex to Decimal Converter
- 1Enter a hex valueWith or without the 0x prefix.
- 2Read the decimalPlus binary and octal.
- 3Copy the resultOne tap.
Key Features
- Accepts 0x, # and bare hex in any capitalisation
- Place-value working shown
- Binary and octal shown alongside
- Exact for arbitrarily large values
- Clear error for invalid hex digits
Frequently Asked Questions
How do I convert hex to decimal by hand?
Multiply each digit by 16 raised to its position from the right, then add. 0x1F is (1 × 16) + 15 = 31, remembering that A–F are 10–15.
What does the 0x prefix mean?
It marks the number as hexadecimal in C-derived languages, so 0x10 is 16 rather than ten. Other conventions include a trailing h in assembly and a leading # for colours.
Why is hex used for colours and addresses?
Because one hex digit maps to exactly four bits, so a byte is always two digits. That makes #FF8800 immediately readable as three byte-sized channels, and memory addresses align to recognisable boundaries.
Does capitalisation matter?
No. 0xFF, 0xff and 0xFf are the same value. Uppercase is the more common convention for constants and colours.
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