Hexadecimal to Octal
Convert a hexadecimal number to its octal (base-8) value.
About the Hexadecimal to Octal converter
This tool converts between two compact computing bases, hexadecimal (base-16) and octal (base-8). The two do not share a clean digit grouping, so the value is read in full and re-expressed in octal, turning hex 1FF into octal 777. It is useful when a value comes to you in hex but the system or document you are working with expects octal.
How to use it
- Enter a hexadecimal number using 0-9 and A-F.
- The octal equivalent appears straight away.
- Copy the octal result for your config, script, or notes.
A typical use is normalising mixed-base values into a single format for a permissions table or report. The converter accepts upper or lower case letters, treats the input as an unsigned whole number, and handles long values exactly, so large numbers convert without rounding. A leading 0x prefix is not part of the number. Everything runs in your browser, so the values you enter are never uploaded.
Frequently asked questions
Why is there no direct digit mapping between hex and octal?
Hex groups bits in fours and octal groups them in threes, so the digits do not line up. The number is converted through its full value rather than by regrouping digits.
What digits will the octal output use?
Octal is base-8, so the result contains only the digits 0 through 7.
Is the hex input case-sensitive?
No. The letters A-F may be entered in upper or lower case and produce the same octal result.
Is the value I enter uploaded?
No. The conversion runs in your browser, so your input stays on your device.