Octal addition

Client

Add base-8 numbers for Unix permission math and legacy computing exercises.

How to use

Enter two octal numbers.

About Octal addition

Add two octal integers—shows octal and decimal sum, browser-only. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

10 + 7 = 0o17 (15 decimal)

Nearby workflows on Toolcore

  • Octal subtraction — Subtract two octal integers—octal and decimal difference in browser. when the payload needs a different encoding or escape format.
  • Octal ↔ decimal — Convert octal literals to decimal or decimal to octal—radix helper. when the payload needs a different encoding or escape format.
  • Binary addition — Add two binary strings and return sum as binary. when the payload needs a different encoding or escape format.
  • Hexadecimal addition — Add two hexadecimal integers of any length—BigInt math in your browser. when the payload needs a different encoding or escape format.

Common use cases

  • Verify chmod-style octal sums.
  • Practice non-decimal arithmetic.

Common mistakes to avoid

  • Digits 8-9

    Octal uses digits 0 through 7 only.

FAQ

0o prefix?

Optional; leading 0o is stripped before parse.

More tools

Related utilities you can open in another tab—mostly client-side.