This new calculator including shortcut commands converts RGB to HEX and HEX to RGB.
Shortcut examples are r:100,g:140,b:220 and #CCCCCC

I'm aware that there are quite a few converters out there, but none of them show the math, which is why I created this one. I've also added the shortcuts so you can just click and go if you need to.

RGBHEX Converter