Convert Square feet to square miles

1 square foot = 0.000000036 square miles · mi² = ft² ÷ 27,878,400

ft²
Square miles
0.000000036mi²

1 square foot = 0.000000036 square miles

When you need this conversion

This conversion goes from square feet, the standard US unit for property and flooring, to square miles, used for US counties, states, and large regions. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.

Square feet to square miles conversion table

Conversion table from square feet to square miles
Square feet (ft²)Square miles (mi²)
1 ft²0.000000036 mi²
2 ft²0.000000072 mi²
3 ft²0.000000108 mi²
5 ft²0.000000179 mi²
10 ft²0.000000359 mi²
15 ft²0.000000538 mi²
20 ft²0.000000717 mi²
25 ft²0.000000897 mi²
50 ft²0.000001794 mi²
75 ft²0.00000269 mi²
100 ft²0.000003587 mi²
250 ft²0.000008968 mi²
500 ft²0.000017935 mi²
1,000 ft²0.00003587 mi²

The formula

mi² = ft² ÷ 27,878,400

Because both units measure area, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.

Convert the other way

Square miles to square feet →

Related area conversions

All area conversions →

Frequently asked questions

How many square miles are in a square foot?
There are 0.000000036 square miles in 1 square foot. The formula is mi² = ft² ÷ 27,878,400.
How do you convert square feet to square miles?
Use the formula mi² = ft² ÷ 27,878,400. For example, 10 square feet equals 0.000000359 square miles.
Is the square feet to square miles conversion exact?
Yes. Square feet and square miles are both units of area, related by an exact defined factor. Displayed results are rounded for readability.
What is ft² short for?
ft² is the standard symbol for square foot (also written as sq ft). mi² is the symbol for square mile.