Hex to Decimal Converter — Free Online Hexadecimal to Decimal
Convert hexadecimal (base 16) numbers to decimal (base 10) instantly — supports batch conversion and swap direction.
Tip: Enter multiple values (one per line) for batch conversion.
Frequently Asked Questions
Hexadecimal to Decimal Conversion Explained
Hexadecimal (base 16) and decimal (base 10) are two of the most common number systems in computing. Decimal is what humans use for everyday arithmetic, while hexadecimal is preferred by developers and systems programmers because it maps cleanly to binary — each hex digit represents exactly 4 bits.
To convert hex to decimal manually, you expand the hex number in powers of 16. For example, FF = (15 × 16) + 15 = 255 in decimal. 100 in hex = 256 in decimal. This tool performs that calculation instantly using JavaScript's built-in parseInt(value, 16).
Common hex values you'll encounter: 0xFF (255 — max byte value), 0x7FFFFFFF(2147483647 — max 32-bit signed integer), 0xDEADBEEF (a classic debug sentinel value), and 0x0A (10 — the newline character in ASCII/Unix).