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OCT to HEX Converter Online

Converting octal numbers to hexadecimal (HEX) is often needed when working with Unix file permissions and low-level data representations.

number-base
OCT → HEX
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10

Decimal (DEC)

Convert from/to decimal number system

01

Binary (BIN)

Convert from/to binary number system

0x

Hexadecimal (HEX)

Convert from/to hexadecimal number system

0o

Octal (OCT)

Convert from/to octal number system

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DEC to HEX Converter Online DEC to BIN Converter Online HEX to DEC Converter Online BIN to DEC Converter Online OCT to DEC Converter Online

Frequently Asked Questions

The easiest way is to first convert octal to binary (each digit = 3 bits), then group the bits into sets of 4 and convert to HEX. For example, 377₈ = 011 111 111₂ = 0FF₁₆.
Octal is widely used in Unix/Linux for file permissions (chmod 755), and appears in some programming languages for numeric literals.
Yes, you can use a lookup table where each pair of octal digits maps to one and a half HEX digits. In practice, the binary method is simpler and more intuitive — just remember three bits per octal digit.