Square Feet to Square Miles Conversion

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

SWAP UNITS
Results in Square Miles:
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1 sq ft = 3.587E-8 sq mi

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 50,000,000 square feet to square miles using the formula above.
50,000,000 sq ft = (50,000,000 × 3.587E-8) = 1.793503 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.[1] 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 to Square Mile Conversion Table

Square foot measurements converted to square miles
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
100 sq ft 0.000003587 sq mi
1,000 sq ft 0.00003587 sq mi
10,000 sq ft 0.000359 sq mi
100,000 sq ft 0.003587 sq mi
1,000,000 sq ft 0.03587 sq mi
10,000,000 sq ft 0.358701 sq mi
100,000,000 sq ft 3.587 sq mi

References

  1. Merriam-Webster, square foot, https://www.merriam-webster.com/dictionary/square%20foot