📐 Number Base Converter
Convert numbers between different bases: binary (2), octal (8), decimal (10) and hexadecimal (16). Select the input base and see all conversions simultaneously.
Input base
Conversion
The number base converter changes a value between binary, octal, decimal and hexadecimal and shows every representation at a glance. It is handy for programmers, students and anyone working across different number bases.
How the calculator works and what it’s for▾
What number bases mean
The everyday decimal system uses ten digits (0–9). Binary uses just two (0 and 1), octal uses eight and hexadecimal uses sixteen, where the letters A–F stand for the values 10 to 15.
Computers process data as binary at the lowest level, but hexadecimal is a more compact way for people to read the same bits.
How the conversion works
The converter first reads the input from its own base into decimal and then displays it in the other bases. Each digit is weighted by powers of its base.
Binary output is often grouped into blocks of four bits, which is easier to read and maps directly to a single hexadecimal digit.
Who it is for
It is an everyday helper in programming, electronics and networking, where addresses and colors are frequently written in hexadecimal.
For students it illustrates how the same number looks different in different bases without being a different value.
Good to know
Hexadecimal numbers are often marked with the prefix 0x and binary with 0b to avoid confusing the base.
The same string of bits can always be read as both binary and hexadecimal — it is only the notation that changes, not the value.
🔄 Reviewed June 2026
Frequently asked questions
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