Number Base Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) — all in real time.
Frequently Asked Questions
How do I convert between binary, decimal and hexadecimal?
Type a number into any field — binary, octal, decimal or hexadecimal — and the other bases update instantly. This makes it easy to convert values while programming or studying.
What are binary, octal, decimal and hex?
They are number systems with different bases: binary is base 2 (0–1), octal is base 8 (0–7), decimal is base 10 (0–9), and hexadecimal is base 16 (0–9 and A–F). Computers use binary internally, and hex is a compact way to write it.
Why is hexadecimal common in programming?
Each hex digit maps neatly to four binary bits, so hex is a concise, human-readable way to represent binary data such as memory addresses, color codes and byte values.
Does it convert large numbers accurately?
Yes, within the precision limits of standard numbers. For everyday programming values the conversions are exact across all four bases.