-64.81% is the change from 645 to 227
Calculation steps:
[( 227 - 645 ) ÷ 645] x 100 = -64.81%
Formula
Percentage change = [(227 - 645) / 645] x 100
Subtract the new number by the original number
227 - 645 = -418
-418 ÷ 645 = -0.648062015503876
-0.648062015503876 x 100 = -64.81%
Example