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Hexadecimal (often shortened to hex) is a base-16 number system. It is widely used in computing as a more human-friendly way of representing binary data. This lesson explains how hexadecimal works and why it is useful.
Hexadecimal uses 16 symbols to represent values:
| Denary | Hex | Binary (4-bit) |
|---|---|---|
| 0 | 0 | 0000 |
| 1 | 1 | 0001 |
| 2 | 2 | 0010 |
| 3 | 3 | 0011 |
| 4 | 4 | 0100 |
| 5 | 5 | 0101 |
| 6 | 6 | 0110 |
| 7 | 7 | 0111 |
| 8 | 8 | 1000 |
| 9 | 9 | 1001 |
| 10 | A | 1010 |
| 11 | B | 1011 |
| 12 | C | 1100 |
| 13 | D | 1101 |
| 14 | E | 1110 |
| 15 | F | 1111 |
Because hex needs 16 symbols but we only have 10 numerical digits (0–9), the letters A to F are used to represent the values 10 to 15.
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