Binary, Hex & Decimal Converter
Convert between number bases
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About this calculator
Type a number, choose its base and see it in decimal, binary, hexadecimal and octal. Handy for programming, networking and electronics.
The formula
Value = Σ digit × base^position
Worked exampleDecimal 255 = binary 11111111 = hex FF = octal 377.
Frequently asked questions
Why does hex use letters?
Base 16 needs 16 symbols, so A–F represent 10–15.
Can it handle negatives?
Yes, with a leading minus sign.
How big a number can I use?
Very large integers are supported using BigInt.
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