151.17% is the change from 256 to 643
Calculation steps:
[( 643 - 256 ) ÷ 256] x 100 = 151.17%
Formula
Percentage change = [(643 - 256) / 256] x 100
Subtract the new number by the original number
643 - 256 = 387
387 ÷ 256 = 1.51171875
1.51171875 x 100 = 151.17%