Convert between binary, decimal, hexadecimal and octal — type in any field and all others update instantly.
Number base conversion is fundamental in computer science, electronics and programming. Binary (base 2) is how computers process data, hexadecimal (base 16) is used for memory addresses, colour codes and bytecode, and octal (base 8) appears in Unix file permissions. Type in any field and all other bases update instantly. The bit breakdown visualises the binary structure of your number.
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| Decimal | Binary | Hex | Octal |
|---|---|---|---|
| 0 | 0000 | 0 | 0 |
| 8 | 1000 | 8 | 10 |
| 10 | 1010 | A | 12 |
| 15 | 1111 | F | 17 |
| 16 | 10000 | 10 | 20 |
| 32 | 100000 | 20 | 40 |
| 64 | 1000000 | 40 | 100 |
| 128 | 10000000 | 80 | 200 |
| 255 | 11111111 | FF | 377 |
Decimal (base 10) is what we use daily — digits 0-9. Binary (base 2) uses only 0 and 1, the language computers operate in. Hexadecimal (base 16) uses 0-9 and A-F — widely used in programming, memory addresses and web colour codes (#FF5733). Octal (base 8) uses digits 0-7, still used in Unix file permissions.
Understanding number bases is essential in computer science, low-level programming, digital electronics and cryptography. A single byte (8 bits) can hold values from 0 (00000000) to 255 (11111111) in binary, or 0x00 to 0xFF in hex.