Hex to Decimal Converter

Type a hexadecimal number and get its decimal value, plus binary and octal.

Number In Word size bits Signed (two's complement)

Decimal
Hex
Binary
Octal

Click a bit to flip it.

How to convert hex to decimal

Hexadecimal (base 16) uses the digits 0-9 and the letters A-F, where A is 10 and F is 15. Each place is worth a power of 16, so the rightmost digit is worth 1, the next 16, then 256, and so on.

Worked example

Convert 1A3F: 1 × 4096 + 10 × 256 + 3 × 16 + 15 = 4096 + 2560 + 48 + 15 = 6719.

Quick facts

FF is 255, the largest value of one byte.
FFFF is 65535, the largest 16-bit unsigned value.
A leading 0x is only a marker; the converter accepts it and ignores it.
Tick Signed to read a hex value as two's complement: FF at 8 bits is -1.

Other conversions

Hex to decimal · Decimal to hex
Binary to decimal · Decimal to binary
Hex to binary · Binary to hex
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