Octal Calculator
Convert a decimal number to octal.
Worth Knowing
Octal, base 8, uses digits 0 through 7 and maps to exactly three binary bits per digit. It's less common today than hexadecimal but persists in one very visible place: Unix file permissions, where 755 or 644 are octal encodings of read/write/execute bits. Like all base conversions, going decimal-to-octal doesn't alter the number's value — it only re-expresses the same quantity using powers of eight instead of powers of ten.
How to Use
- Enter Decimal number into the Octal Calculator above.
- Your result appears instantly as you type — there's no submit button or page reload.