218.43% is the change from 255 to 812
Calculation steps:
[( 812 - 255 ) ÷ 255] x 100 = 218.43%
Formula
Percentage change = [(812 - 255) / 255] x 100
Subtract the new number by the original number
812 - 255 = 557
557 ÷ 255 = 2.184313725490196
2.184313725490196 x 100 = 218.43%