221.48% is the change from 256 to 823
Calculation steps:
[( 823 - 256 ) ÷ 256] x 100 = 221.48%
Formula
Percentage change = [(823 - 256) / 256] x 100
Subtract the new number by the original number
823 - 256 = 567
567 ÷ 256 = 2.21484375
2.21484375 x 100 = 221.48%