218.36% is the change from 256 to 815
Calculation steps:
[( 815 - 256 ) ÷ 256] x 100 = 218.36%
Formula
Percentage change = [(815 - 256) / 256] x 100
Subtract the new number by the original number
815 - 256 = 559
559 ÷ 256 = 2.18359375
2.18359375 x 100 = 218.36%