How do I convert hex to decimal?

Each hex digit represents 4 bits and has a value from 0-15 (0-9, A=10, B=11, C=12, D=13, E=14, F=15). Multiply each digit by 16 raised to its positional power and sum the results. For example, 0xFF = 15×16 + 15×1 = 255.

Does this converter accept the 0x prefix?

Yes. You can enter hex values with or without the 0x or # prefix. The converter strips those characters automatically before parsing.

What is the largest hex value I can convert?

JavaScript's Number.MAX_SAFE_INTEGER is 9007199254740991 (0x1FFFFFFFFFFFFF). Values beyond this may lose precision. For arbitrarily large numbers, BigInt would be needed.

Hex to Decimal

Convert hexadecimal numbers to decimal, binary, and octal.

Hexadecimal Number

Accepts input with or without 0x or # prefix.

Decimal (base 10)

255

Binary (base 2)

11111111

Octal (base 8)

377

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FAQ

How do I convert hex to decimal?: Each hex digit represents 4 bits and has a value from 0-15 (0-9, A=10, B=11, C=12, D=13, E=14, F=15). Multiply each digit by 16 raised to its positional power and sum the results. For example, 0xFF = 15×16 + 15×1 = 255.
Does this converter accept the 0x prefix?: Yes. You can enter hex values with or without the 0x or # prefix. The converter strips those characters automatically before parsing.
What is the largest hex value I can convert?: JavaScript's Number.MAX_SAFE_INTEGER is 9007199254740991 (0x1FFFFFFFFFFFFF). Values beyond this may lose precision. For arbitrarily large numbers, BigInt would be needed.

The Hex to Decimal converter parses a hexadecimal (base-16) value and outputs the equivalent decimal (base-10), binary (base-2), and octal (base-8) numbers. Accepts input with or without the 0x prefix. Results are shown in a card grid with copy buttons.