Hex to Decimal Converter Online

Memory addresses, IPv6 networks, and machine code are almost always output in Hexadecimal (Base-16). But if you actually need to do mathematical arithmetic on those values or pass them to a high-level API, you have to convert them back into standard Base-10 Decimals. This parser is built to handle that radix math instantly.

Radix Exponent Math

The script processes the hex string from right to left. It takes the numeric value of each character (e.g., F = 15), and multiplies it by 16 raised to the power of its position index. It then sums all the products together. For 2F, the math is (15 * 16^0) + (2 * 16^1) = 47.

The MAX_SAFE_INTEGER Limit

JavaScript uses 64-bit floating-point numbers. It can only safely calculate exact integers up to 9,007,199,254,740,991. If you try to paste a massive 64-character SHA-256 hash into this calculator to find its decimal equivalent, the math engine will hit the MAX_SAFE_INTEGER limit and lose precision, resulting in a slightly inaccurate rounded number.

Number vs. Text Distinctions

A common mistake developers make is trying to convert Hex text using a Hex number calculator. If you have the string 48 65 6C 6C 6F, that is ASCII encoded text (spelling "Hello"). If you put that into this math calculator, it will treat it as one giant number and output billions.