Decimal to Octal

Your data never leaves your browser

Convert decimal numbers (base-10) to octal (base-8).

Brie — Bug Reporting Tool

Found a bug while testing?

Brie captures screenshots, console logs, network data, and session replays in one click — so developers get the full context without the back-and-forth.

Install Brie — It's FreeLearn more →

About Decimal to Octal

Enter one or more decimal integers and convert them to their octal (base-8) representation. Octal is commonly used in Unix/Linux file permissions and system programming.

How to use

  1. Enter one decimal number per line in the input panel.
  2. The octal equivalent appears instantly in the output panel.
  3. Click Copy to copy the results to your clipboard.

More Number / Base Conversion

Octal to Decimal

Convert octal numbers (base-8) to decimal (base-10).

Decimal to Binary

Convert decimal numbers (base-10) to binary (base-2).

Decimal to Hex

Convert decimal numbers (base-10) to hexadecimal (base-16).

Frequently Asked Questions

FAQs about Decimal to Octal

How do I convert decimal to octal?

Divide the number by 8 repeatedly, recording the remainder each time. Read the remainders from bottom to top to get the octal representation.

What is 493 in octal?

493 in decimal is 755 in octal — the classic Unix rwxr-xr-x permission value.

Can I convert multiple numbers at once?

Yes. Enter one decimal number per line and the tool will convert each one individually.

What is the largest number I can convert?

This tool uses JavaScript's Number type, which safely handles integers up to 2^53 - 1 (about 9 quadrillion).

How is octal different from hexadecimal?

Octal uses base 8 (digits 0–7) while hexadecimal uses base 16 (digits 0–9 and A–F). Hexadecimal is more compact: two hex digits encode one byte.