212.5% is the change from 256 to 800
Calculation steps:
[( 800 - 256 ) ÷ 256] x 100 = 212.5%
Formula
Percentage change = [(800 - 256) / 256] x 100
Subtract the new number by the original number
800 - 256 = 544
544 ÷ 256 = 2.125
2.125 x 100 = 212.5%
Example