Octal Calculator
Perform arithmetic on base-8 octal numbers with decimal and hexadecimal cross-checks.
Base-8 arithmetic for permissions and legacy systems
Octal (base 8) still appears in Unix file permissions, embedded documentation, and digital logic coursework. Enter two octal integers, pick an operation, and read the octal answer plus decimal and hexadecimal equivalents.
For other radices, try the Binary Calculator, Decimal to Octal Converter, or Octal to Decimal Converter.
Frequently Asked Questions
Which digits are valid in octal?
Only 0 through 7. The digit 8 or 9 makes the input invalid for base 8.
How is division handled?
Integer division uses the floor of the decimal quotient, then converts the result back to octal.
Why convert through decimal?
Performing math in base 10 avoids manual carry mistakes, then the final value is encoded back into octal for display.
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