63.87% is the change from 393 to 644
Calculation steps:
[( 644 - 393 ) ÷ 393] x 100 = 63.87%
Formula
Percentage change = [(644 - 393) / 393] x 100
Subtract the new number by the original number
644 - 393 = 251
251 ÷ 393 = 0.638676844783715
0.638676844783715 x 100 = 63.87%