An acer is a tree so there is no conversion.
If you meant an acre, there is still no conversion. A mile is a measure of distance while an acre is a measure of area. The two measure different things and it makes no sense to try to convert from one to the other without additional information.
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1 square mile = 640 acres
1 mile = 5,280 ft (5,280 ft x 5,280 ft) = 27,878,400 sq ft = 1 square mile = 640 acres (1 'section') 1 acre = (27,878,400 / 640) = 43,560 sq ft
1 square mile = 640 acres 6 square miles = 3,840 acres
1 mile equals to 1.609344 km
To calculate square feet you need both a length and a width.1 mile is equal to 5,280 linear feet. One square mile (1 mile x 1 mile) is equal to 27,878,400 square feet.