Convert Square miles to square feet

1 square mile = 27,878,400 square feet · ft² = mi² × 27,878,400

mi²
Square feet
27,878,400ft²

1 square mile = 27,878,400 square feet

When you need this conversion

This conversion goes from square miles, used for US counties, states, and large regions, to square feet, the standard US unit for property and flooring. 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 miles to square feet conversion table

Conversion table from square miles to square feet
Square miles (mi²)Square feet (ft²)
1 mi²27,878,400 ft²
2 mi²55,756,800 ft²
3 mi²83,635,200 ft²
5 mi²139,392,000 ft²
10 mi²278,784,000 ft²
15 mi²418,176,000 ft²
20 mi²557,568,000 ft²
25 mi²696,960,000 ft²
50 mi²1,393,920,000 ft²
75 mi²2,090,880,000 ft²
100 mi²2,787,840,000 ft²
250 mi²6,969,600,000 ft²
500 mi²13,939,200,000 ft²
1,000 mi²27,878,400,000 ft²

The formula

ft² = mi² × 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 feet to square miles →

Related area conversions

All area conversions →

Frequently asked questions

How many square feet are in a square mile?
There are 27,878,400 square feet in 1 square mile. The formula is ft² = mi² × 27,878,400.
How do you convert square miles to square feet?
Use the formula ft² = mi² × 27,878,400. For example, 10 square miles equals 278,784,000 square feet.
Is the square miles to square feet conversion exact?
Yes. Square miles and square feet are both units of area, related by an exact defined factor. Displayed results are rounded for readability.
What is mi² short for?
mi² is the standard symbol for square mile. ft² is the symbol for square foot.