Square Foot Calculator
A square foot calculator finds the area of a surface by multiplying length by width in feet. It is the same calculation as square footage, giving you the square feet of any room, wall or floor. Enter your dimensions below for the area, then use it to size paint, flooring or tile.
- Square feet
- 0 sq ft
- Square yards
- 0 sq yd
Enter your dimensions to see the area.
Estimate only. Densities, yields and prices vary by supplier, moisture and region; confirm before ordering.
How Do You Calculate Square Feet?
To calculate square feet, multiply the length by the width of the area in feet. A surface 15 feet by 8 feet is 120 square feet. If your measurements are in inches, divide each by 12 first to convert to feet. The calculator handles the math and also shows square yards, which some materials like carpet use instead.
How Do You Convert Inches to Square Feet?
To convert measurements in inches to square feet, divide each dimension by 12 to get feet, then multiply. A surface 48 inches by 60 inches is 4 feet by 5 feet, which is 20 square feet. Working in feet keeps the result in square feet directly. The calculator accepts your dimensions and gives the area without manual conversion.
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How Do You Calculate Square Feet?
Formula
Square Feet = Length (ft) x Width (ft)
- Measure length and width in feet.
- Convert any inch measurements to feet by dividing by 12.
- Multiply length by width for the area in square feet.
Worked example
A surface 15 feet by 8 feet is 15 x 8 = 120 square feet. If the width were 8 feet 6 inches, that is 8.5 feet, so 15 x 8.5 = 127.5 square feet.
- Square feet and square footage mean the same thing: area in feet.
- For materials sold by the square yard (like carpet), divide your square feet by 9.
Frequently asked questions
- How do I calculate square feet?
- Multiply length by width in feet. A 15 by 8 foot area is 120 square feet. Convert inches to feet first by dividing by 12.
- Is square foot the same as square footage?
- Yes. Square feet and square footage refer to the same area measurement, length times width in feet.
- How do you convert inches to square feet?
- Divide each inch measurement by 12 to get feet, then multiply length by width. For example, 48 inches by 60 inches is 4 feet by 5 feet, which is 20 square feet.