Convert between octal, decimal, binary, and hexadecimal instantly. Enter a whole number in any base, see matching values, and copy results.
Use this octal converter to switch between octal, decimal, binary, and hexadecimal instantly. Enter a whole number in any base and the other number systems update at the same time.
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Octal lookup table
| Decimal number (positive) | Octal number |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 10 |
| 9 | 11 |
| 10 | 12 |
| Decimal number (positive) | Octal number |
|---|---|
| 11 | 13 |
| 12 | 14 |
| 13 | 15 |
| 14 | 16 |
| 15 | 17 |
| 16 | 20 |
| 32 | 40 |
| 64 | 100 |
| 128 | 200 |
| 256 | 400 |
| 512 | 1000 |
Octal Converter FAQ
What does this octal converter do?
This tool converts between octal, decimal, binary, and hexadecimal in one place. Enter a whole number in any field and the matching values update instantly.
When would I use octal conversion?
Octal conversion is useful in programming, file permissions, digital systems, and study tasks where base-8 notation appears beside binary, decimal, or hexadecimal values.
Can I convert octal to binary or hexadecimal?
Yes. The octal field works as both input and output, so you can convert octal to binary, binary to octal, octal to hex, or compare all four number systems side by side.
