While it's true that both Windows and Macintosh have calculators that make it possible to convert RGB to Hex and Hex to RGB, why use a calculator when you can just scan a chart. What gets really scary is when you start being able to convert RGB to hex just by looking at the numbers. That's how I can tell when I've been working on color schemes too long - when I start thinking that Christmas is on December 19 and my birthday is December 10. But most of the time, I just use the chart.

• RGB to Hexadecimal Color Codes Chart