Number Base Converter — Decimal, Binary, Hex, Octal
Convert numbers between decimal, binary, octal, and hexadecimal instantly. Free online number base converter.
Binary
0b101010
Octal
0o52
Decimal
42
Hexadecimal
0x2A
Value: 42Bits: 6Bytes: 1
Number Base Systems
Computers use different number systems: binary (base 2) for machine code, octal (base 8) for Unix file permissions, decimal (base 10) for everyday math, and hexadecimal (base 16) for memory addresses and colors.
Common Conversions
Decimal 255 = Binary 11111111 = Hex FF = Octal 377. Hexadecimal is especially common in web development for CSS colors (e.g., #FF5733).