163.14% is the change from 312 to 821
Calculation steps:
[( 821 - 312 ) ÷ 312] x 100 = 163.14%
Formula
Percentage change = [(821 - 312) / 312] x 100
Subtract the new number by the original number
821 - 312 = 509
509 ÷ 312 = 1.6314102564102564
1.6314102564102564 x 100 = 163.14%