Square Feet to Square Miles Conversion (sq ft to sq mi)

Square Feet to Square Miles Converter

Enter the area in square feet below to convert it to square miles.

Result in Square Miles:

1 sq ft = 3.587E-8 sq mi

Hint: use a scientific notation calculator to convert E notation to decimal

How to Convert Square Feet to Square Miles

To convert a measurement in square feet to a measurement in square miles, divide the area by the following conversion ratio: 27,878,400 square feet/square mile.

Since one square mile is equal to 27,878,400 square feet, you can use this simple formula to convert:

square miles = square feet ÷ 27,878,400

The area in square miles is equal to the area in square feet divided by 27,878,400.

For example, here's how to convert 50,000,000 square feet to square miles using the formula above.

square miles = (50,000,000 sq ft ÷ 27,878,400) = 1.793503 sq mi

conversion scale showing square feet and equivalent square miles area values

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

What Is a Square Foot?

One square foot is equivalent to the area of a square with sides that are each 1 foot in length.^[1] One square foot is equal to 144 square inches or 0.092903 square meters .

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.

You can use a square footage calculator to calculate the area of a space if you know its dimensions.

Learn more about square feet.

What Is a Square Mile?

One square mile is equal to the area of a square with sides that are each 1 mile long. One square mile is roughly equal to 2.59 square kilometers or 640 acres.

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.

Learn more about square miles.

Square Foot to Square Mile Conversion Table

Table showing various 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

Table showing various 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

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