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Hex Calculator
Convert between hexadecimal, decimal, binary, and octal. Perform hex arithmetic and calculations for programming and web design.
Enter a value in any field — all others update instantly.
Binary (Base 2)
Decimal (Base 10)
Hexadecimal (Base 16)
Octal (Base 8)
8-bit Representation
1
1
1
1
1
1
1
1
128
64
32
16
8
4
2
1
How to Use the Hex Calculator
Enter your values above for an instant result. This tool uses verified formulas and is optimised for users in USA, Canada, UK, Australia. All calculations happen in your browser — your data is never sent to our servers.
Frequently Asked Questions
How do you convert hex to decimal?
Hex FF = 15×16 + 15×1 = 255. Each hex digit represents 4 binary bits, so FF in binary is 11111111.