Convert Square Feet to Square Miles

Enter the area in square feet below to get the value converted to square miles.

Results in Square Miles:

1 sq ft = 3.587E-8 sq mi

Do you want to convert square miles to square feet?

How to Convert Square Feet to Square Miles

conversion scale showing square feet and equivalent square miles area values

To convert a square foot measurement to a square mile measurement, multiply the area by the conversion ratio. One square foot is equal to 3.587E-8 square miles, so use this simple formula to convert:

square miles = square feet × 3.587E-8

The area in square miles is equal to the square feet multiplied by 3.587E-8.

For example, here's how to convert 5 square feet to square miles using the formula above.

5 sq ft = (5 × 3.587E-8) = 1.7935E-7 sq mi

Square feet and square miles are both units used to measure area. Keep reading to learn more about each unit of measure.

Square Feet

One square foot is equal to the area of a square with sides that are 1 foot in length. One square foot is roughly equal to 144 square inches.

The square foot is a US customary and imperial unit of area. A square foot is sometimes also referred to as a square ft. Square feet can be abbreviated as sq ft, and are also sometimes abbreviated as ft². For example, 1 square foot can be written as 1 sq ft or 1 ft².

Try our square footage calculator to calculate the area of a space.

Square Miles

One square mile is equal to the area of a square with sides that are 1 mile long. One square mile is roughly equal to 2.59 square kilometers.

The square mile is a US customary and imperial unit of area. Square miles can be abbreviated as sq mi, and are also sometimes abbreviated as mi². For example, 1 square mile can be written as 1 sq mi or 1 mi².

Square Foot Measurements and Equivalent Square Mile Conversions

Common square foot values converted to the equivalent square mile value
Square Feet	Square Miles
1 sq ft	0.00000003587 sq mi
2 sq ft	0.00000007174 sq mi
3 sq ft	0.00000010761 sq mi
4 sq ft	0.00000014348 sq mi
5 sq ft	0.00000017935 sq mi
6 sq ft	0.00000021522 sq mi
7 sq ft	0.00000025109 sq mi
8 sq ft	0.00000028696 sq mi
9 sq ft	0.00000032283 sq mi
10 sq ft	0.0000003587 sq mi
11 sq ft	0.00000039457 sq mi
12 sq ft	0.00000043044 sq mi
13 sq ft	0.00000046631 sq mi
14 sq ft	0.00000050218 sq mi
15 sq ft	0.00000053805 sq mi
16 sq ft	0.00000057392 sq mi
17 sq ft	0.00000060979 sq mi
18 sq ft	0.00000064566 sq mi
19 sq ft	0.00000068153 sq mi
20 sq ft	0.0000007174 sq mi
21 sq ft	0.00000075327 sq mi
22 sq ft	0.00000078914 sq mi
23 sq ft	0.00000082501 sq mi
24 sq ft	0.00000086088 sq mi
25 sq ft	0.00000089675 sq mi
26 sq ft	0.00000093262 sq mi
27 sq ft	0.00000096849 sq mi
28 sq ft	0.0000010044 sq mi
29 sq ft	0.0000010402 sq mi
30 sq ft	0.0000010761 sq mi
31 sq ft	0.000001112 sq mi
32 sq ft	0.0000011478 sq mi
33 sq ft	0.0000011837 sq mi
34 sq ft	0.0000012196 sq mi
35 sq ft	0.0000012555 sq mi
36 sq ft	0.0000012913 sq mi
37 sq ft	0.0000013272 sq mi
38 sq ft	0.0000013631 sq mi
39 sq ft	0.0000013989 sq mi
40 sq ft	0.0000014348 sq mi

More Square Foot Area Conversions

US Customary

Convert to Acres: 1 sq ft is equal to 2.2957E-5 acres
Convert to Square Yards: 1 sq ft is equal to 0.111111 square yards
Convert to Square Inches: 1 sq ft is equal to 144 square inches

SI Units

Convert to Square Kilometers: 1 sq ft is equal to 9.2903E-8 square kilometers
Convert to Square Meters: 1 sq ft is equal to 0.092903 square meters
Convert to Square Centimeters: 1 sq ft is equal to 929.0304 square centimeters
Convert to Square Millimeters: 1 sq ft is equal to 92,903 square millimeters