Number Base Converter
Binary, octal, decimal and hexadecimal — all at once.
Best for: Use it in programming, digital electronics and networking, or to read colour codes and memory addresses.
Input
How it's calculated & sources
Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.
How it works
Each digit's value = digit × baseposition. Supports any base from 2 to 36 (digits 0-9 then A-Z) for both input and output.
Example
255 (base 10) = FF (base 16) = 11111111 (base 2) = 377 (base 8) = 73 (base 36).
Frequently asked questions
Which bases are supported?+
Any base from 2 to 36 for input and output — binary, octal, decimal, hex, and unusual bases like 3, 12 or 36.
Negative numbers?+
Positive integers only; two's-complement representation is not used here.
Is conversion real-time?+
Yes — values update instantly as you type in either field, with full bidirectional input.
Where does the number base reference come from?+
All factors are SI-anchored using internationally accepted conversions.
Continue your journey
Where people usually head next.