Convert square feet to square miles

Conversion Calculator

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Convert ft² to mi²

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

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

Conversion Definitions

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

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.

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.

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 ft² to mi² is:

mi² = ft² ÷ 27,878,400

Conversion Example

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

Square Feet to Square Mile Conversion Example

Task: Convert 50,000,000 square feet to square miles (show work)

Formula:
ft² ÷ 27,878,400 = mi²

Calculations:
50,000,000 ft² ÷ 27,878,400 = 1.79350321 mi²

Result:
50,000,000 ft² is equal to 1.79350321 mi²

Conversion Table

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

Square Feet to Square Miles Conversion Chart

square feet (ft²)	square miles (mi²)
1 ft²	0.00000004 mi²
2 ft²	0.00000007 mi²
3 ft²	0.00000011 mi²
4 ft²	0.00000014 mi²
5 ft²	0.00000018 mi²
6 ft²	0.00000022 mi²
7 ft²	0.00000025 mi²
8 ft²	0.00000029 mi²
9 ft²	0.00000032 mi²
10 ft²	0.00000036 mi²
20 ft²	0.00000072 mi²
30 ft²	0.00000108 mi²
40 ft²	0.00000143 mi²
50 ft²	0.00000179 mi²
75 ft²	0.00000269 mi²
100 ft²	0.00000359 mi²
250 ft²	0.00000897 mi²
500 ft²	0.00001794 mi²
750 ft²	0.0000269 mi²
1,000 ft²	0.00003587 mi²
2,500 ft²	0.00008968 mi²
5,000 ft²	0.00017935 mi²
7,500 ft²	0.00026903 mi²
10,000 ft²	0.0003587 mi²
25,000 ft²	0.00089675 mi²
50,000 ft²	0.0017935 mi²
75,000 ft²	0.00269025 mi²
100,000 ft²	0.00358701 mi²
250,000 ft²	0.00896752 mi²

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 feet to square miles - Area Conversions