The result of your conversion between acre and square mile appears here
To convert between Acre and Square Mile you have to do the following:
First divide 0.09290304*43560 / 0.09290304*27878400 = 0.0015625
Then multiply the amount of Acre you want to convert to Square Mile, use the chart below to guide you.
Symbol: ac
No description
Symbol: mi²
No description