Util Monster
Free
A calculator for converting between hexadecimal and decimal numbers and performing hexadecimal arithmetic operations.
Hexadecimal is a number system that uses 16 symbols: 0-9 and A-F, where A=10, B=11, C=12, D=13, E=14, F=15. It is widely used in web color codes (#FF0000), memory addresses, MAC addresses, etc. Four binary digits can be simply expressed as one hexadecimal digit, making it very efficient.
To convert hexadecimal to decimal, multiply each digit by powers of 16 and sum them. For example, hex 2F is (2×16¹)+(15×16⁰) = 32+15 = 47 (decimal). Hex FF is (15×16¹)+(15×16⁰) = 240+15 = 255. This calculator performs conversions automatically.
To convert decimal to hexadecimal, repeatedly divide the decimal number by 16 and read the remainders in reverse order. For example, converting decimal 255: 255÷16=15 remainder 15(F), 15÷16=0 remainder 15(F), reading in reverse gives FF. Decimal 100 is 64 in hex.
In HTML and CSS, colors are expressed in hexadecimal. In the #RRGGBB format, RR is red (00-FF), GG is green (00-FF), BB is blue (00-FF). Examples: #FF0000 is red, #00FF00 is green, #0000FF is blue, #FFFFFF is white, #000000 is black. Each color channel has a range of 0-255 (decimal).
Hexadecimal operations are used in programming for bit masking, memory address calculations, and network packet analysis. For example, bit AND operations can extract specific bits, and OR operations can set bits. Hexadecimal is also essential when analyzing memory dumps during debugging.
Hexadecimal is widely used in web design (color codes), MAC addresses (00:1A:2B:3C:4D:5E), IPv6 addresses, file signatures (magic numbers), QR codes, encryption keys, Unicode character codes (U+0041), etc. You can also check hex color codes when using color pickers in developer tools.