216.02% is the change from 256 to 809
Calculation steps:
[( 809 - 256 ) ÷ 256] x 100 = 216.02%
Formula
Percentage change = [(809 - 256) / 256] x 100
Subtract the new number by the original number
809 - 256 = 553
553 ÷ 256 = 2.16015625
2.16015625 x 100 = 216.02%