Binary to Octal Converter
Convert binary to octal instantly — type on the left and the result appears on the right. Everything runs in your browser, nothing is uploaded.
How to convert binary to octal
Octal groups binary into threes rather than fours, because 8 is 2 to the 3rd power. It is an older shorthand for binary, still seen in Unix file permissions.
Method: 3 bits map to one octal digit, so you just group and swap.
- Group into 3 bitsSplit the binary into groups of three bits, starting from the right.
- Pad the last groupAdd leading zeros if the leftmost group is short.
- Swap each group for an octal digit000 = 0 up to 111 = 7. Read the octal digits in order.
Examples 11010 = 3211111111 = 377
Binary to Octal Table
Common binary values with their octal equivalents.
| Binary | Octal |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 10 | 2 |
| 11 | 3 |
| 100 | 4 |
| 101 | 5 |
| 110 | 6 |
| 111 | 7 |
| 1000 | 10 |
| 1001 | 11 |
| 1010 | 12 |
| 1011 | 13 |
| 1100 | 14 |
| 1101 | 15 |
| 1110 | 16 |
| 1111 | 17 |
| 10000 | 20 |
| 10100 | 24 |
| 100000 | 40 |
| 110010 | 62 |
| 1000000 | 100 |
| 1100100 | 144 |
| 10000000 | 200 |
| 11111111 | 377 |
| 100000000 | 400 |
| 1000000000 | 1000 |
| 1111101000 | 1750 |
Related conversions
Frequently asked questions
How do you convert binary to octal?
Split the binary into groups of three bits from the right, pad the last group with zeros, then replace each group with its octal digit (000 = 0 … 111 = 7). So 110101 = 65.
Why groups of three for octal?
Because 8 equals 2 to the 3rd power, so three bits map to exactly one octal digit.
What is 111 in octal?
111 in binary is 7 in octal — the largest single octal digit.