Decimal to Octal
Type a decimal number below to get the octal value — other bases are shown too. The manual method is explained further down.
Try it
Custom base
Two’s complement
How to convert by hand
Divide by 8 repeatedly, note each remainder, then read the remainders from bottom to top:
493 ÷ 8 = 61 … 5
61 ÷ 8 = 7 … 5
7 ÷ 8 = 0 … 7
→ 755
Reference table
Decimal → Octal
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 10
9 11
10 12
11 13
12 14
13 15
14 16
15 17
16 20
32 40
64 100
100 144
127 177
128 200
255 377
256 400
1000 1750
1024 2000
4096 10000
65535 177777
In code
JavaScript
(493).toString(8) // '755'Python
format(493, 'o') # '755' (oct(493) → '0o755')