-66.26% is the change from 821 to 277
Calculation steps:
[( 277 - 821 ) ÷ 821] x 100 = -66.26%
Formula
Percentage change = [(277 - 821) / 821] x 100
Subtract the new number by the original number
277 - 821 = -544
-544 ÷ 821 = -0.6626065773447016
-0.6626065773447016 x 100 = -66.26%