256.1% is the change from 123 to 438
Calculation steps:
[( 438 - 123 ) ÷ 123] x 100 = 256.1%
Formula
Percentage change = [(438 - 123) / 123] x 100
Subtract the new number by the original number
438 - 123 = 315
315 ÷ 123 = 2.5609756097560976
2.5609756097560976 x 100 = 256.1%