Hex to Decimal Converter
Convert hex to decimal instantly. Free online hexadecimal to decimal calculator for programmers—expand each digit by powers of 16.
How to Convert Hex to Decimal
To convert hex to decimal, multiply each hex digit by its corresponding power of 16 and sum the results. Hex digits A-F represent decimal values 10-15. This hex to decimal conversion is essential for web development, programming, and understanding hexadecimal number systems.
Hex to decimal: multiply each hex digit by 16^position (0-9, A=10…F=15) and sum. Essential for colors (#FF0000), memory addresses, and debugging.
0x2A = 2×16 + 10 = 42.
Web color codes (#RRGGBB). The table and FAQ on this page walk through the factor if you need it.
Conversion Examples
Example: FF hex to decimal
- 15×16 + 15 = 255
FF hex = 255 decimal
Max 8-bit value.
Example: 2A hex to decimal
- 2×16 + 10 = 42
2A hex = 42 decimal
Two-digit hex.
Common Use Cases
- Web color codes (#RRGGBB).
- Embedded register values.
- CS homework and interviews.
- MAC addresses and UUID fragments.
Frequently Asked Questions
How do I convert hex to decimal?
Multiply each digit by 16^n from right, sum results.
What is A in hex?
10 in decimal (B=11 … F=15).
What is 10 hex in decimal?
16.