Octal to Hexadecimal

What is the Octal to Hexadecimal Converter?

This tool converts octal numbers (base-8) to hexadecimal (base-16), bridging old and new computing notations.

Why Convert Octal to Hex?

This conversion is useful when:

• Modernizing code — updating legacy octal literals to hex
• Cross-referencing — comparing Unix and Windows documentation
• Learning — understanding number system relationships
• Debugging — interpreting mixed-format output

The Conversion

Octal to hex requires converting through binary or decimal as an intermediate step.

Example: 755 → 111101101 → 1ED → 0x1ED

How to Use

1. Enter octal number — digits 0-7 only
2. View hex result — automatically converted
3. Use in modern context — prefix with 0x for code

Common Permission Values

• 644 (octal) = 1A4 (hex)
• 755 (octal) = 1ED (hex)
• 777 (octal) = 1FF (hex)
• 400 (octal) = 100 (hex)

Note

Octal 377 = hex FF = decimal 255 = one byte maximum value.