Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal. All bases displayed simultaneously.
What is a Number Base Converter?
Converts numbers between different bases: binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16). Used by programmers, students, hardware engineers, anyone working with computer systems. Computers natively use binary; humans use decimal; hex is convenient shorthand for binary.
How to use
- Choose source base — Binary, octal, decimal, or hex
- Enter value — In that base's valid characters
- Click Convert — All four bases shown
- Copy any conversion — For your code or notes
Tips
- Binary: only 0,1 valid chars
- Octal: 0-7
- Decimal: 0-9
- Hex: 0-9 and A-F
- Bit count: 4 bits = 1 hex digit; 8 bits = 2 hex digits = 1 byte
- 255 in dec = FF in hex = 11111111 in binary
FAQs
Why do programmers use hex?
Compact representation of binary. 1 byte (8 bits) = 2 hex chars instead of 8 binary digits. Easier to read in colors (#FF5733), memory addresses, bytecode.
Negative numbers?
This tool handles positive integers. For negative, computers use two's complement — bit-pattern dependent on integer size (8-bit, 16-bit, 32-bit, 64-bit).
Decimal point support?
Whole numbers only here. For floating-point conversion, need specialized tool that handles IEEE 754 format.