Octal Converter

Convert octal (base 8) to decimal or decimal to octal. Digits 0–7 only.

Octal Converter

ModeOctal → DecimalDecimal → Octal

Input

Output

CopyClear

How it works

Octal uses digits 0–7. Same idea as hex: each digit is a power of 8.

When to use it

Use for file permissions (chmod) or legacy systems.

Frequently asked questions

Where is octal used?

Unix file permissions (e.g. 755) are often written in octal.