Square Miles to Square Feet Converter

Use this converter to easily convert between Square Miles and Square Feet (sq mi to sq ft).

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How many Square Feet equal one Square Mile?

Exactly 27,878,400 square feet equal one square mile, since a mile is defined as 5,280 feet and a square mile is the are of a square with a side of 5,280 (5,280 · 5,280 = 27,878,400). Both units are currently defined through the meter with a foot being 0.3048 meters long. The symbol for square feet is "ft2", often written as "sq ft" while the symbol for square mile is "mi2", often written as "sq mi". Note that writing square miles as m2 or "sq m" could lead to confusion with square meters.

Difference between Square Miles and Square Feet

Both square feet and square miles are units of area, but of vastly different magnitude. Sq ft are commonly used to measure smaller areas such as the area of a building or room, while square miles are mostly used for tracts of land. Both units are part of the Imperial system of units with a long history of usage behind them.

Historically, the foot varied in length from country to country and even from city to city, usually between 250 mm and 335 mm, but is now fixed at exactly 0.3048 meters. The foot is widely used only in the United States and it is partially used in Canada and the United Kingdom, where road signs must use imperial units, but distances on them are usually given in miles or yards, not feet. Square feet are used mostly in relation to real estate area measurements.

Miles were used as far back as the Romans (Roman mile equal to 5,000 feet), and different definitions existed in different places and at different times, e.g. English mile, Scot mile, Italian mile. Miles are currently only used in a couple of countries in the world, like the United States and the United Kingdom and so are square miles.

How to convert Square Miles to Square Feet

To convert sq mi to sq ft, multiply the measurement in square miles by 27,878,400 to get the area in square feet. Using a calculator is usually helpful when accuracy is desired, or the numbers involved are large. Our free online square miles to square feet converter should be of assistance in any situation, even offline, given you've loaded the page in your browser and left it open in it.

Square Miles to Square Feet conversion example

Sample task: convert 10 mi2 to ft2. Solution:

Formula:
sq mi * 27878400 = sq ft
Calculation:
10 sq mi * 27,878,400 = 278,784,000 sq ft
End result:
10 sq mi is equal to 278,784,000 sq ft

Square Miles to Square Feet conversion table

sq mi to sq ft conversion table
sq mi sq ft
1 sq mi 27,878,400 sq ft
2 sq mi 55,756,800 sq ft
3 sq mi 83,635,200 sq ft
4 sq mi 111,513,600 sq ft
5 sq mi 139,392,000 sq ft
6 sq mi 167,270,400 sq ft
7 sq mi 195,148,800 sq ft
8 sq mi 223,027,200 sq ft
9 sq mi 250,905,600 sq ft
10 sq mi 278,784,000 sq ft
20 sq mi 557,568,000 sq ft
30 sq mi 836,352,000 sq ft
40 sq mi 1,115,136,000 sq ft
50 sq mi 1,393,920,000 sq ft
60 sq mi 1,672,704,000 sq ft
70 sq mi 1,951,488,000 sq ft
80 sq mi 2,230,272,000 sq ft
90 sq mi 2,509,056,000 sq ft
100 sq mi 2,787,840,000 sq ft
200 sq mi 5,575,680,000 sq ft
300 sq mi 8,363,520,000 sq ft
400 sq mi 11,151,360,000 sq ft
500 sq mi 13,939,200,000 sq ft
600 sq mi 16,727,040,000 sq ft
700 sq mi 19,514,880,000 sq ft
800 sq mi 22,302,720,000 sq ft
900 sq mi 25,090,560,000 sq ft
1,000 sq mi 27,878,400,000 sq ft

References:

[1] NIST Special Publication 330 (2008) - "The International System of Units (SI)", edited by Barry N.Taylor and Ambler Thompson

[2] International Organization for Standardization (1993). ISO Standards Handbook: Quantities and units (3rd edition). Geneva: ISO. ISBN 92-67-10185-4.

Cite this converter & page

If you'd like to cite this online converter resource and information as provided on the page, you can use the following citation:
Georgiev G.Z., "Square Miles to Square Feet Converter", [online] Available at: https://www.gigacalculator.com/converters/convert-square-miles-to-feet-sqmi-sqft.php URL [Accessed Date: 21 Jul, 2019].