Binary to Octal Converter

Q: What is 111 in octal?

111 is 7 in octal, and 7 in decimal too: 4 + 2 + 1. It is the largest value one octal digit can hold.

Paste binary and this binary to octal converter splits it into 3-bit groups, one octal digit each: 110101 becomes 65. The groups appear under the answer.

Updated November 1, 2026 · How we check the converters

Binary to octal

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Octal

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How to convert binary to octal

01
Group in threes from the right
Pad the leftmost group with zeros if it is short: 11010 becomes 011 010.
02
Convert each group
Each 3-bit group is one digit from 0 to 7. The places are worth 4, 2 and 1, so 011 is 3 and 010 is 2.
03
Write the digits in order
11010 is 32 in octal, and 26 in decimal.

Octal digits and their 3 bits

The eight 3-bit groups. This is the whole lookup you need.

Octal digits and their 3 bits
Octal	Binary	Decimal
0	000	0
1	001	1
2	010	2
3	011	3
4	100	4
5	101	5
6	110	6
7	111	7

Binary to octal table, 0 to 63

Search the table

Binary to octal table, 0 to 63
Decimal	Binary	Octal
0	0	0
1	1	1
2	10	2
3	11	3
4	100	4
5	101	5
6	110	6
7	111	7
8	1000	10
9	1001	11
10	1010	12
11	1011	13
12	1100	14
13	1101	15
14	1110	16
15	1111	17
16	10000	20
17	10001	21
18	10010	22
19	10011	23
20	10100	24
21	10101	25
22	10110	26
23	10111	27
24	11000	30
25	11001	31
26	11010	32
27	11011	33
28	11100	34
29	11101	35
30	11110	36
31	11111	37
32	100000	40
33	100001	41
34	100010	42
35	100011	43
36	100100	44
37	100101	45
38	100110	46
39	100111	47
40	101000	50
41	101001	51
42	101010	52
43	101011	53
44	101100	54
45	101101	55
46	101110	56
47	101111	57
48	110000	60
49	110001	61
50	110010	62
51	110011	63
52	110100	64
53	110101	65
54	110110	66
55	110111	67
56	111000	70
57	111001	71
58	111010	72
59	111011	73
60	111100	74
61	111101	75
62	111110	76
63	111111	77

Examples

A few conversions with their groups:

111 is 7, the largest single octal digit.
1000 is 10 in octal: pad it to 001 000.
11111111 (255) is 377 in octal: 011 111 111.
111101101 is 755, the file permission setting rwxr-xr-x on Linux and macOS.

Frequently asked questions

How do you convert binary to octal?

Split the binary into groups of 3 bits from the right, padding the leftmost group with zeros, then replace each group with its digit from 0 to 7. For example, 101110 is 101 110, which is 56 in octal.

What is 111 in octal?

111 is 7 in octal, and 7 in decimal too: 4 + 2 + 1. It is the largest value one octal digit can hold.

Why group binary in threes for octal?

Octal is base 8, and 8 is 2 to the power of 3, so every octal digit stands for exactly 3 bits. The conversion becomes a lookup with no arithmetic, the same way binary to hex uses groups of 4.