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Number Base Converter Online

Free tool for converting numbers between DEC, BIN, HEX and OCT

number-base
DEC → 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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Frequently Asked Questions

A number base (or radix) is a system for writing numbers using a specific set of symbols. Decimal uses digits 0-9, binary uses 0 and 1, octal uses 0-7, and hexadecimal uses 0-9 plus letters A-F.
Each hexadecimal digit maps to exactly four bits, making HEX a compact way to represent binary data. This is convenient for memory addresses, CSS colors, and bitwise operations.
To convert to decimal, multiply each digit by the base raised to its positional power and sum the results. To convert from decimal, repeatedly divide by the target base and record the remainders.
Binary is used in network masks and file permissions. Octal appears in Unix chmod commands. Hexadecimal is used in CSS colors, MAC addresses, and software debugging.