Which bases are supported?

Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Input in any one and see all four simultaneously.

Why is hex shown with letters?

Hexadecimal uses digits 0-9 plus A-F to represent values 10-15. So decimal 255 = hex FF, decimal 16 = hex 10.

This tool supports unsigned positive integers. For signed binary (two’s complement), use a specialized calculator.

Binary is the native language of computers. Every number, character, and instruction is ultimately a sequence of 0s and 1s.

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Which bases are supported?: Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Input in any one and see all four simultaneously.
Why is hex shown with letters?: Hexadecimal uses digits 0-9 plus A-F to represent values 10-15. So decimal 255 = hex FF, decimal 16 = hex 10.
Can I enter negative numbers?: This tool supports unsigned positive integers. For signed binary (two’s complement), use a specialized calculator.
What is binary used for?: Binary is the native language of computers. Every number, character, and instruction is ultimately a sequence of 0s and 1s.