Convert square feet to square miles
Enter a square feet value below and convert to square miles
ft²
1 square foot ≈
0.0000000359 square miles
* rounded result
Select how many decimal places the result will be rounded to:
How to convert square feet to square miles
To convert square feet to square miles, divide a square feet value by 27878400.
Formula mi² = ft² / 27878400
Example: Convert 100000 square feet to square miles Calculations: 100000 ft² / 27878400 ≈ 0.00359 mi²
Square foot (ft²)
The square foot is the imperial system's unit of area, defined as the area of a square with sides of 1 foot. It is equal to about 0.0929 square meters.
Square mile (mi²)
The square mile is the imperial system's unit of area, defined as the area of a square with sides of 1 mile. It is equal to about 2.59 square kilometers.