545% is the change from 100 to 645
Calculation steps:
[( 645 - 100 ) ÷ 100] x 100 = 545%
Formula
Percentage change = [(645 - 100) / 100] x 100
Subtract the new number by the original number
645 - 100 = 545
545 ÷ 100 = 5.45
5.45 x 100 = 545%
Example