Explained with a place-value breakdown — reference tables, charts, and a live converter.
Enter a hexadecimal number to convert it instantly into decimal.
| Decimal | Binary | Octal | Hexadecimal |
|---|---|---|---|
| 0 | 0 | 0 | 0 |
| 1 | 1 | 1 | 1 |
| 2 | 10 | 2 | 2 |
| 3 | 11 | 3 | 3 |
| 4 | 100 | 4 | 4 |
| 5 | 101 | 5 | 5 |
| 6 | 110 | 6 | 6 |
| 7 | 111 | 7 | 7 |
| 8 | 1000 | 10 | 8 |
| 9 | 1001 | 11 | 9 |
| 10 | 1010 | 12 | A |
| 11 | 1011 | 13 | B |
| 12 | 1100 | 14 | C |
| 13 | 1101 | 15 | D |
| 14 | 1110 | 16 | E |
| 15 | 1111 | 17 | F |
| 16 | 10000 | 20 | 10 |
| 32 | 100000 | 40 | 20 |
| 64 | 1000000 | 100 | 40 |
| 128 | 10000000 | 200 | 80 |
| 255 | 11111111 | 377 | FF |
| 256 | 100000000 | 400 | 100 |
| 1024 | 10000000000 | 2000 | 400 |
| Power | In decimal | Decimal value |
|---|---|---|
| 100 | 1 | 1 |
| 101 | 10 | 10 |
| 102 | 100 | 100 |
| 103 | 1000 | 1000 |
| 104 | 10000 | 10000 |
| 105 | 100000 | 100000 |
| 106 | 1000000 | 1000000 |
| 107 | 10000000 | 10000000 |
| 108 | 100000000 | 100000000 |
| 109 | 1000000000 | 1000000000 |
| 1010 | 10000000000 | 10000000000 |
| 1011 | 100000000000 | 100000000000 |
| 1012 | 1000000000000 | 1000000000000 |
A number base (radix) defines how many digits are used and what each position is worth. Decimal uses ten digits and powers of ten, binary uses just two digits and powers of two, and hexadecimal uses sixteen digits and powers of sixteen.
The value itself never changes — only how it is written. These conversions are pure integer math and exact: 255 is always 0xFF.
Hex appears everywhere in computing: CSS color codes, memory addresses, MAC addresses, and byte values. One byte (8 bits) fits exactly into two hex digits (00–FF), i.e. 0 to 255.
Enter a hexadecimal number to convert it instantly into decimal.
Each digit is multiplied by its place value (a power of 16); the sum is the value, which is then written in decimal. The converter above does this instantly.
Hexadecimal (base 16) is compact: each hex digit maps to exactly four bits (one nibble). That is why color codes, memory addresses, and byte values are almost always written in hex — 255 is FF, far shorter than 11111111.
Yes. Converting between number bases is pure integer math and perfectly exact — the same value, just written a different way. 255 is always 0xFF.
Convert more
The number base converter covers binary, octal, decimal, and hexadecimal with an exact place-value breakdown.