Number Base Converter
Convert between binary, octal, decimal and hexadecimal.
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Step by step
The formula
parse in source base → re-express in each target base
A number's value comes from digit weights that are powers of the base. Computers use binary because transistors are on or off; hexadecimal is shorthand for it, since one hex digit packs exactly four bits, making addresses and colour codes far easier to read.
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Example calculations
Common questions this calculator answers — select one to load its values.
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Frequently asked questions
What is hexadecimal used for?+
Hex (base 16) compactly represents binary data — each hex digit maps to exactly four bits, so it is common for colours, memory addresses and hashes.
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