In Graphic designing, Photoshop or be it in UX designing, colour is an important aspect. So this tool helps the user to convert the HEX value into an RGB value. Steps used by this tool to convert the HEX to RGB is as below:
The hex value is of six digits, first two digits of the Hex will be converted to obtain the red colour level. Two digits in the middle will be converted to obtain green colour level. And the last two digits will be converted to obtain a blue colour level.
Hex Value : FF0000
RGB calculation: 
R = FF16 = 25510
G = 0016 = 010
B = 0016 = 010
Result : RGB = (255, 0, 0).