Convert square miles to square feet

Conversion Calculator

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Convert mi² to ft²

TIP: If the result of your conversion is 0, try increasing the "Decimals".

How to convert mi² to ft²: Enter a value in the mi² field and click on the "Calculate square feet" button. Your answer will appear in the ft² field.

Conversion Definitions

The following is a list of definitions relating to conversions between square miles and square feet.

What is a square mile (mi²)?

A square mile is a unit of area in both US Customary Units as well as the Imperial System. The symbol for square mile is mi² or sq mi. There are 0.00000004 square miles in a square foot. A square mile is calculated as the area of a square that has 1 mile on each side.

What is a square foot (ft²)?

A square foot is a unit of area in both US Customary Units as well as the Imperial System. The symbol for square foot is ft² or sq ft. There are 27,878,400 square feet in a square mile. A square foot is calculated as the area of a square that has 1 foot on each side.

Conversion Formula

Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.

The formula to convert from mi² to ft² is:

ft² = mi² x 27,878,400

Conversion Example

Next, let's look at an example showing the work and calculations that are involved in converting from square miles to square feet (mi² to ft²).

Square Mile to Square Feet Conversion Example

Task: Convert 100 square miles to square feet (show work)

Formula:
mi² x 27,878,400 = ft²

Calculations:
100 mi² x 27,878,400 = 2,787,840,000 ft²

Result:
100 mi² is equal to 2,787,840,000 ft²

Conversion Table

For quick reference purposes, below is a conversion table that you can use to convert from mi² to ft².

Square Miles to Square Feet Conversion Chart

square miles (mi²)	square feet (ft²)
1 mi²	27,878,400 ft²
2 mi²	55,756,800 ft²
3 mi²	83,635,200 ft²
4 mi²	111,513,600 ft²
5 mi²	139,392,000 ft²
6 mi²	167,270,400 ft²
7 mi²	195,148,800 ft²
8 mi²	223,027,200 ft²
9 mi²	250,905,600 ft²
10 mi²	278,784,000 ft²
20 mi²	557,568,000 ft²
30 mi²	836,352,000 ft²
40 mi²	1,115,136,000 ft²
50 mi²	1,393,920,000 ft²
75 mi²	2,090,880,000 ft²
100 mi²	2,787,840,000 ft²
250 mi²	6,969,600,000 ft²
500 mi²	13,939,200,000 ft²
750 mi²	20,908,800,000 ft²
1,000 mi²	27,878,400,000 ft²
2,500 mi²	69,696,000,000 ft²
5,000 mi²	139,392,000,000 ft²
7,500 mi²	209,088,000,000 ft²
10,000 mi²	278,784,000,000 ft²
25,000 mi²	696,960,000,000 ft²
50,000 mi²	1,393,920,000,000 ft²
75,000 mi²	2,090,880,000,000 ft²
100,000 mi²	2,787,840,000,000 ft²
250,000 mi²	6,969,600,000,000 ft²

Related Units

This table provides a summary of the Area units within their respective measurement systems.

Unit	Symbol	Measurement System	Description
square inches	in² or sq in	US Customary Units/Imperial System	1,296 in² = 1 yd²
square feet	ft² or sq ft	US Customary Units/Imperial System	1 ft² = 144 in²
square yards	yd² or sq yd	US Customary Units/Imperial System	1 yd² = 9 ft²
acres	ac	US Customary Units/Imperial System	1 ac = 4,840 yd²
square miles	mi² or sq mi	US Customary Units/Imperial System	1 mi² = 640 ac
square millimeters	mm²	Metric System	1 m² = 1,000,000 mm²
square centimeters	cm²	Metric System	1 m² = 10,000 cm²
square decimeters	dm²	Metric System	1 m² = 100 dm²
square meters	m²	Metric System	base unit
square decameters	dam²	Metric System	1 dam² = 100 m²
square hectometers	hm²	Metric System	1 hm² = 10,000 m²
hectares	ha	Metric System	1 ha = 10,000 m²
square kilometers	km²	Metric System	1 km² = 1,000,000 m²

Note: For area conversions, US Customary Units and the Imperial System are equivalent.

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Convert square miles to square feet - Area Conversions