1 acre = 43,560 s.f.
1 sq mile= 5280 x 5280 sf = 27, 883, 680 sf
Therefore, there are 640 acres per square mile
Therefore, the Hinckley fire burnt approx 256,000 acres.
To have that much burn in 4 hours is pretty scary.
It was the largest forest fire in American history. It burned the entire north shore of Green Bay from just north of the city of Green Bay up over the Michigan border. Estimated 1300-1500 dead. At least 800 dead in the town of Peshtigo ALONE.