Use this octal calculator to add, subtract, multiply, or divide two octal (base 8) numbers. Results display in octal with conversions to all bases.
Octal calculator
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Using the calculator
Enter two octal numbers in the Number 1 and Number 2 fields. Select your operation from the Operation dropdown: addition, subtraction, multiplication, or division.
Results calculate instantly in octal, with conversions to binary, decimal, and hexadecimal shown below. Use the Binary, Octal, Decimal, or Hex buttons to switch input bases.
What is octal?
Octal (base 8) uses digits 0-7. Each position represents a power of 8. Octal was popular in early computing because it maps cleanly to groups of 3 binary digits, making it easier to read binary data.
