62.43% is the change from 511 to 830
Calculation steps:
[( 830 - 511 ) ÷ 511] x 100 = 62.43%
Formula
Percentage change = [(830 - 511) / 511] x 100
Subtract the new number by the original number
830 - 511 = 319
319 ÷ 511 = 0.62426614481409
0.62426614481409 x 100 = 62.43%
Example