Hex to Octal Converter

A hex to octal converter turns a hexadecimal value into an octal number. Hex and octal are both shorthand systems for binary, but they group bits differently, so converting between them by hand is easy to get wrong.

The reliable route is through binary. Each hex digit becomes four binary digits, and then those binary digits are grouped in threes from the right to make octal digits. This tool follows that route for you and shows the result, with no rounding and no sign up.

This converter is useful for computing study, embedded work and reading older code that uses octal. Everything runs in your browser, so your value never leaves your device.

Worked example: hex FF to octal

Convert FF to binary first: F is 1111, and the second F is also 1111, giving 11111111.

Group the binary digits in threes from the right: 11, 111 and 111. Pad the left group with a zero to make 011.

Convert each group: 011 is 3, 111 is 7, and 111 is 7.

Put the groups together: 377. So FF in hex is 377 in octal. You can check it, since FF is 255 in decimal and 3 times 64 plus 7 times 8 plus 7 equals 255.

How to Use This Tool

1. Enter a hex value using digits 0 to 9 and letters A to F only.
2. Press Convert to see the octal result and the conversion steps.
3. Copy the result or download it as a text file.
4. Use Load Sample to try FF, which converts to 377.

Why Use This Tool

• Uses the reliable binary route, so grouping mistakes are avoided.
• Exact for long hex values, with no rounding and no sign up.
• Rejects invalid hex digits with a plain error message.
• Private by design, since nothing leaves your device.

Common Values

Related Conversions

If you need a different direction, try the Hex to Binary Converter, Hex to Decimal Converter, Octal to Hex Converter and Binary to Octal Converter. Each one works the same way, in your browser, with the steps shown so you can check the answer.

Frequently Asked Questions