How to convert square feet to square miles
To convert a measurement in square feet to square miles, multiply the value by 0.00000003587. The conversion factor comes from the relationship between both units and the square meter.
For example, to convert 5 ft² to square miles: 5 × 0.00000003587 = 0.00000017935 mi².
What is a square foot?
A square foot is an imperial and US customary unit of area equal to the area of a square one foot on each side, about 0.0929 square meters. The square foot is the dominant unit for floor area in US and UK real estate, where home and office sizes are quoted in square feet. It remains the everyday area unit throughout the imperial world.
Common uses of square feet include: Home and office floor area in the US and UK; Real estate listings and rent per square foot; Flooring, tiling, and paint coverage; Retail and commercial space sizing.
What is a square mile?
A square mile is an imperial and US customary unit of area equal to the area of a square one mile on each side, or 640 acres, about 2.59 square kilometers. The square mile is the traditional unit for large land areas in the US and UK. In the US Public Land Survey System, a 'section' is exactly one square mile, the building block of the township grid.
Common uses of square miles include: Areas of US and UK cities and counties; Land survey sections (640 acres); Geographic and census area reporting; Property and ranch land in imperial countries.
Square Feet to square miles worked examples
Here are some common values converted:
1 ft² = 0.00000003587 mi² 5 ft² = 0.00000017935 mi² 10 ft² = 0.000000358701 mi² 50 ft² = 0.000001793503 mi² 100 ft² = 0.000003587006 mi²
Frequently asked questions
How many square miles are in one square foot?
One square foot (ft²) equals 0.00000003587 square miles (mi²). Multiply any value in square feet by 0.00000003587 to convert to square miles.
How do I convert square feet to square miles?
Multiply the value in square feet by 0.00000003587. For example, 5 ft² × 0.00000003587 = 0.00000017935 mi².
How do I convert square miles to square feet?
Multiply the value in square miles by 27,878,400, or divide by 0.00000003587. Use the swap button on the converter above to reverse the direction.
Is the square foot to square mile conversion exact?
Yes. Area conversions derive from the exact 1959 international definitions of the meter, yard, and foot, so the factors are exact.
What is the formula for square feet to square miles?
The formula is: mi² = ft² × 0.00000003587. This comes from the definition of both units relative to the square meter.