# Convert square feet to square miles

Enter the number of square feet you want to convert to square miles in the text box below. The conversion to area in square miles will update as you type.

square feet (sq ft)
1 square feet = 3.587×10-8 square miles

## Precise decimal and fraction answers

The conversion in square miles rounded to six significant decimal places is 1 sq ft = 3.58701E-08 sq mi. The precise fraction answer is 1/27878400 sq mi.

### Decimal Precision

Conversion from one to ten decimal places

• 1 sq ft = 4E-08 sq mi
• 1 sq ft = 3.6E-08 sq mi
• 1 sq ft = 3.59E-08 sq mi
• 1 sq ft = 3.587E-08 sq mi
• 1 sq ft = 3.5870E-08 sq mi
• 1 sq ft = 3.58701E-08 sq mi
• 1 sq ft = 3.587006E-08 sq mi
• 1 sq ft = 3.5870064E-08 sq mi
• 1 sq ft = 3.58700643E-08 sq mi
• 1 sq ft = 3.587006428E-08 sq mi

## Square feet to square miles conversion factor and formulas

Formula

The conversion factor between square feet and square miles is 27,878,400. This represents the ratio of square feet per one square mile. To calculate the value in square miles, we can either divide by the conversion factor or multiply by its inverse.

### Division

To convert from square feet to square miles, divide square feet by 27,878,400.
The formula is expressed as:
sq ft ÷ 27,878,400 = sq mi

### Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 27,878,400 is 1/27,878,400 or 0. To convert from square feet to square miles, multiply square feet by 0.
The formula is expressed as:
sq ft × 0 = sq mi

When converting from from square feet to square miles, both units are within the US Customary / UK Imperial system and conversion factors are governed by standards set by the controlling body.

## Reverse this conversion

Convert from square miles to square feet instead.

## 1 square feet to other area units

### Metric

• 1 sq ft = 9.29×10-6 ha
• 1 sq ft = 9.29×10-8 km2
• 1 sq ft = 0.093 m2
• 1 sq ft = 9.29 dm2
• 1 sq ft = 929.03 cm2
• 1 sq ft = 92,903.04 mm2
• 1 sq ft = 9.29×1010 µ2
• 1 sq ft = 9.29×1016 nm2

### Imperial/U.S.

• 1 sq ft = 2.296×10-5 acre
• 1 sq ft = 3.587×10-8 sq mi
• 1 sq ft = 0.111 sq yd
• 1 sq ft = 1 sq ft
• 1 sq ft = 144 sq in

## References and Citations

1. National Institute of Standards and Technology (NIST) General Tables of Units of Measurement

## Square feet to square miles conversion table

sq ft sq mi
1 sq ft 3.587×10-8 sq mi
2 sq ft 7.174×10-8 sq mi
3 sq ft 1.076×10-7 sq mi
4 sq ft 1.435×10-7 sq mi
5 sq ft 1.794×10-7 sq mi
6 sq ft 2.152×10-7 sq mi
7 sq ft 2.511×10-7 sq mi
8 sq ft 2.87×10-7 sq mi
9 sq ft 3.228×10-7 sq mi
10 sq ft 3.587×10-7 sq mi
sq ft sq mi
20 sq ft 7.174×10-7 sq mi
30 sq ft 1.076×10-6 sq mi
40 sq ft 1.435×10-6 sq mi
50 sq ft 1.794×10-6 sq mi
60 sq ft 2.152×10-6 sq mi
70 sq ft 2.511×10-6 sq mi
80 sq ft 2.87×10-6 sq mi
90 sq ft 3.228×10-6 sq mi
100 sq ft 3.587×10-6 sq mi
1,000 sq ft 3.587×10-5 sq mi