-93% is the change from 257 to 18
Calculation steps:
[( 18 - 257 ) ÷ 257] x 100 = -93%
Formula
Percentage change = [(18 - 257) / 257] x 100
Subtract the new number by the original number
18 - 257 = -239
-239 ÷ 257 = -0.9299610894941635
-0.9299610894941635 x 100 = -93%
Example