Decimal to Octal Converter

Convert a decimal number to octal and binary.

Octal 100

Binary 1000000

Hex 40

Formula: repeatedly divide by 8

Step-by-step with your numbers:

1. Values used:

2. Decimal = 64

4. Octal = 100

5. Binary = 1000000

6. Hex = 40

Did we solve your problem today?

Convert a decimal number to base 8.

The math behind it

Repeatedly divide by 8; the remainders (0–7) form the octal number.

64 → 100.

Octal use?

Unix file permissions (chmod) use octal.