Square Footage Calculator
Calculate the area of a rectangular room, floor, wall, yard or property in square feet.
How to Use the Square Footage Calculator
Enter length and width to calculate area in square feet.
Practical Example
A room that is 12 ft by 15 ft has an area of 180 ft².
Factors That Affect the Result
Irregular shapes, alcoves, openings and measurement accuracy can affect total usable area.
Frequently Asked Questions
How do I calculate square feet?
Multiply length in feet by width in feet.
Can I total several rooms?
Yes. Calculate each area and add the results.
Should I round measurements?
Use accurate measurements for better estimates.
Related Tools
Measuring Square Footage
Square footage measures two-dimensional area. For a rectangle, multiply length by width after expressing both dimensions in feet. Irregular spaces can be divided into smaller rectangles, triangles or other simple shapes and then added together.
Use actual finished dimensions when the result will guide flooring, paint or construction purchases. Openings, fixed cabinets and unusable sections may need to be excluded depending on the project. Material orders often require extra coverage for cuts, pattern alignment or waste beyond the ideal measured area.
Understanding Square Footage
For a rectangular space, square footage is length × width. Irregular rooms, lots or project areas can be split into smaller rectangles and other simple shapes, calculated separately and then added together.
Measure all dimensions in feet before multiplying, or convert them first. If the result is being used to buy flooring, paintable panels or other materials, add an appropriate waste or cutting allowance separately rather than changing the geometric area itself.