Data / Number / Computer Science Tools
Hex to Decimal Converter
Convert a hexadecimal number to its exact decimal value, handling arbitrarily large hex numbers correctly.
Enter a hexadecimal number below (with or without a 0x prefix) - this tool converts it to decimal exactly.
For the reverse direction, see the Decimal to Hex Converter.
How Hex-to-Decimal Conversion Works
Each hex digit (0-9, A-F) represents a power of 16 based on its position - the decimal value is the sum of each digit's value multiplied by 16 raised to its position.
How to Use It
- Enter a hex number, with or without a leading
0x. - The decimal equivalent appears instantly.
Limitations
This handles arbitrarily large hex integers accurately using BigInt, avoiding the precision loss that plain JavaScript number parsing would introduce for very long hex strings.
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