Hex to Decimal Converter
Convert hexadecimal numbers to decimal, binary, and octal instantly. Essential tool for programmers and developers.
Decimal
—
Binary —
Octal —
How to Use This Calculator
- Enter your hexadecimal value in the input field (e.g. FF, 1A3F).
- The decimal, binary, and octal equivalents are shown instantly.
- Valid hex characters are 0–9 and A–F (case insensitive).
Formula
Hex to Decimal: sum of (digit × 16^position) for each digit from right (position 0).
FF = (15 × 16¹) + (15 × 16⁰) = 240 + 15 = 255
Example
Example: Convert 1A to decimal:
(1 × 16) + (10 × 1) = 16 + 10 = 26
Frequently Asked Questions
- Hexadecimal is a base-16 number system using digits 0–9 and letters A–F (where A=10, B=11, C=12, D=13, E=14, F=15). It is widely used in computing and color codes.
- Multiply each digit by 16 raised to its positional power, then sum. For example, FF = (15 × 16) + (15 × 1) = 240 + 15 = 255.
- FF in hexadecimal equals 255 in decimal. This is the maximum value of a single byte.
- Hex is convenient because one hex digit represents exactly 4 binary bits (a nibble), making it compact and easy to convert to/from binary.
- 0xFF is the common prefix notation for hex. 0xFF = FF = 255 in decimal.