216.41% is the change from 256 to 810
Calculation steps:
[( 810 - 256 ) ÷ 256] x 100 = 216.41%
Formula
Percentage change = [(810 - 256) / 256] x 100
Subtract the new number by the original number
810 - 256 = 554
554 ÷ 256 = 2.1640625
2.1640625 x 100 = 216.41%