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Octal Calculator

Do arithmetic and bitwise operations on octal (base-8) numbers.

How it works Report a problem

Octal Studio

Advanced base-8 arithmetic & bitwise suite

About the Octal Calculator

Do arithmetic and bitwise operations on octal (base-8) numbers.

How to use the Octal Calculator

  1. Enter Octal A, choose the operation and enter Octal B.
  2. Press Calculate.

Formula and method

Octal uses digits 0 to 7. Each position is a power of 8.

Worked example

77 + 10 = 107 in octal (63 + 8 = 71 in decimal).

Tips

  • Octal is used in Unix file permissions such as 755.
  • Digits 8 and 9 are not valid in octal.

Frequently asked questions

What does chmod 755 mean?
The owner has read, write and execute rights; everyone else has read and execute rights.