Square Miles To Square Feet Conversion (sq Mi To Sq Ft)

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• Square Miles to Square Feet Converter
• How to Convert Square Miles to Square Feet
• How Many Square Feet Are in a Square Mile?
• What Is a Square Mile?
• What Is a Square Foot?
• Square Mile to Square Foot Conversion Table
• References

Person Icon By Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

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Sexton, J. (n.d.). Square Miles to Square Feet Converter. Inch Calculator. Retrieved December 9, 2025, from https://www.inchcalculator.com/convert/square-mile-to-square-foot/

How to Convert Square Miles to Square Feet

To convert a measurement in square miles to a measurement in square feet, multiply 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 feet = square miles × 27,878,400

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

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

square feet = (5 sq mi × 27,878,400) = 139,392,000 sq ft

How Many Square Feet Are in a Square Mile?

There are 27,878,400 square feet in a square mile, which is why we use this value in the formula above.

1 sq mi = 27,878,400 sq ft

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

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.

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.

Square Mile to Square Foot Conversion Table

Table showing various square mile measurements converted to square feet.

Square Miles	Square Feet
0.0000001 sq mi	2.7878 sq ft
0.0000002 sq mi	5.5757 sq ft
0.0000003 sq mi	8.3635 sq ft
0.0000004 sq mi	11.15 sq ft
0.0000005 sq mi	13.94 sq ft
0.0000006 sq mi	16.73 sq ft
0.0000007 sq mi	19.51 sq ft
0.0000008 sq mi	22.3 sq ft
0.0000009 sq mi	25.09 sq ft
0.00000001 sq mi	0.278784 sq ft
0.0000001 sq mi	2.7878 sq ft
0.000001 sq mi	27.88 sq ft
0.00001 sq mi	278.78 sq ft
0.0001 sq mi	2,788 sq ft
0.001 sq mi	27,878 sq ft
0.01 sq mi	278,784 sq ft
0.1 sq mi	2,787,840 sq ft
1 sq mi	27,878,400 sq ft

References

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

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