Hex Converter
Convert a number between hexadecimal and decimal, in either direction.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter a number and choose a direction to convert between hexadecimal and decimal.
Enter a decimal number, or a hexadecimal number (0-9, A-F), depending on the direction chosen below.
Your result
ff
Result
AI explanation
Formula
Repeated division/multiplication by 16 to convert between decimal and hexadecimal place valuesWorked example
Decimal 255 to hex
| Field | Value |
|---|---|
| Value | 255 |
| Convert | from-decimal |
| Result | ff |
Assumptions
- Only non-negative whole numbers are supported.
- Hexadecimal input must use only the digits 0-9 and letters A-F (case-insensitive).
Frequently asked questions
Why is hexadecimal used in programming?
Hex is a compact way to represent binary data — each hex digit represents exactly 4 binary bits, so hex is commonly used for memory addresses, color codes (e.g. #FF5733), and byte values.
How do I convert hex to decimal?
Each hex digit represents a power of 16, from right to left — multiply each digit by its place value (1, 16, 256, ...) and sum the results.
Can this handle very large hex numbers?
Yes — it uses arbitrary-precision arithmetic, so very long hex strings or large decimal numbers convert exactly without losing precision.