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Octal to Hex Converter

Convert octal numbers (base 8) to hexadecimal (base 16) instantly. The tool handles the octal → binary → hex conversion automatically. Enter any octal value and get the hex result in real time.

100% client sideInstant resultNo data sent
Octal to Hexadecimal
Octal (Base 8)
Hexadecimal (Base 16)
Result appears here...

Frequently asked questions

4 answers
Convert octal to binary first (each octal digit = 3 bits), then regroup into sets of 4 bits from the right and convert to hex. For example, octal 377 → 011 111 111 in binary → 1111 1111 → 0xFF. This two-step method always works because both bases are powers of 2.

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About Octal to Hex Conversion

Octal to hex conversion bridges two important but non-directly-mappable number systems. Because 8 = 2³ and 16 = 2⁴ do not share a common exponent, there is no single-digit lookup table between them. The conversion always passes through binary as a natural intermediate. This tool handles all three steps — octal digits to 3-bit groups, bit reassembly, then 4-bit groups to hex digits — so you get the correct hexadecimal output from any octal input without manual calculation.