340% is the change from 145 to 638
Calculation steps:
[( 638 - 145 ) ÷ 145] x 100 = 340%
Formula
Percentage change = [(638 - 145) / 145] x 100
Subtract the new number by the original number
638 - 145 = 493
493 ÷ 145 = 3.4
3.4 x 100 = 340%
Example