How to convert square feet to square inches
To convert a measurement in square feet to square inches, multiply the value by 144. The conversion factor comes from the relationship between both units and the square meter.
For example, to convert 5 ft² to square inches: 5 × 144 = 720 in².
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 inch?
A square inch is an imperial and US customary unit of area equal to the area of a square one inch on each side, exactly 6.4516 square centimeters. The square inch is used for small areas in the US and UK, notably in engineering where pressure is measured in pounds per square inch (psi), one of the most common pressure units in the world.
Common uses of square inches include: Pressure measurement (pounds per square inch); Print and display area; Small material and gasket areas; Product surface and packaging specs.
Square Feet to square inches worked examples
Here are some common values converted:
1 ft² = 144 in² 5 ft² = 720 in² 10 ft² = 1,440 in² 50 ft² = 7,200 in² 100 ft² = 14,400 in²
Frequently asked questions
How many square inches are in one square foot?
One square foot (ft²) equals 144 square inches (in²). Multiply any value in square feet by 144 to convert to square inches.
How do I convert square feet to square inches?
Multiply the value in square feet by 144. For example, 5 ft² × 144 = 720 in².
How do I convert square inches to square feet?
Multiply the value in square inches by 0.006944444444, or divide by 144. Use the swap button on the converter above to reverse the direction.
Is the square foot to square inch 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 inches?
The formula is: in² = ft² × 144. This comes from the definition of both units relative to the square meter.