About

Converting hexadecimal to decimal is a frequent task when interpreting error codes (e.g., Windows Stop Codes), memory addresses, or large integer hash values. While standard calculators fail at 16 digits (the limit of 64-bit precision), this tool uses BigInt logic to process arbitrarily large hexadecimal strings accurately.

This utility is designed for efficiency: it ignores common prefixes like "0x" or "#", accepts mixed-case input, and maintains a local history of recent conversions. This allows developers to compare multiple memory offsets or error values without re-typing them.

Formulas

The value of a hexadecimal string is the sum of each digit multiplied by 16 raised to the power of its position (from right to left, starting at 0).

Value = n∑i=0 d_i × 16ⁱ

For example, 2F:

(2 × 16¹) + (15 × 16⁰) = 32 + 15 = 47

Reference Data

Powers of 16	Decimal Value	Hex Place Value
16⁰	1	1
16¹	16	10
16²	256	100
16³	4,096	1,000
16⁴	65,536	10,000
16⁵	1,048,576	100,000
16⁶	16,777,216	1,000,000

Frequently Asked Questions

No. In hexadecimal notation, "a" and "A" both represent the decimal value 10. This tool treats them identically.

This tool uses JavaScript's BigInt, which is limited only by available system memory. You can convert strings far exceeding standard 64-bit integers (18 quintillion).

G is not a valid hexadecimal character (0-9, A-F). The tool provides instant validation and will display an error message if invalid characters are detected.