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Number System Calculator

Convert between Binary, Hexadecimal, Octal, and Decimal number systems. Enter a value in any field and it will automatically convert to all other number systems.

Decimal (Base 10)

Enter Decimal Number

Digits 0-9 only

Binary (Base 2)

Enter Binary Number

Digits 0-1 only

Hexadecimal (Base 16)

Enter Hex Number

Digits 0-9 and letters A-F

Octal (Base 8)

Enter Octal Number

Digits 0-7 only

About Number Systems:

Decimal (Base 10): Uses digits 0-9. This is the number system we use in everyday life.
Binary (Base 2): Uses only 0 and 1. This is the language of computers.
Hexadecimal (Base 16): Uses digits 0-9 and letters A-F. Commonly used in programming and web design (colors, memory addresses).
Octal (Base 8): Uses digits 0-7. Less common but still used in some computing contexts.