This Square Footage Calculator helps you calculate the area of rooms, walls, floors, borders, circles, annulus shapes, triangles, trapezoids and other common project layouts. Choose the area or shape, enter the required dimensions, and the tool instantly shows the total square footage in sq ft.
How To Calculate Square Footage
For a rectangle or room, square footage is length in feet x width in feet. For other shapes, the calculator applies the correct area formula, such as pi x radius x radius for a circle, 1/2 x base x height for a triangle, and 1/2 x (base A + base B) x height for a trapezoid. If you have multiple same-size areas, multiply the result by the number of areas.
When This Sq Ft Calculator Is Useful
- Measuring room area before buying flooring, carpet or tiles.
- Estimating wall, deck, patio or office space dimensions.
- Subtracting window space from a wall measurement.
- Calculating circular borders, annulus areas and rectangular borders.
- Checking property, renovation and interior design measurements.
- Converting square feet into square meters or square yards.
Square Feet Formula
If your room is 12 feet long and 10 feet wide, the square footage is 12 x 10 = 120 sq ft. For two same rooms, the total is 120 x 2 = 240 sq ft. For an irregular space, select the closest shape or split the area into smaller parts and add the results. This calculator handles feet, inches, yards, meters, square feet, square meters and square yards depending on the selected shape.
Frequently Asked Questions
What is square footage?
Square footage is the area of a space measured in square feet. It tells you how much surface area a floor, room or rectangle covers.
How do I measure a room for square footage?
Measure the length and width of the room, then multiply them together. For an irregular layout, split the space into smaller rectangles and add the square footage of each part.
Can I use this calculator for flooring?
Yes. It is useful for flooring estimates, but many projects need extra material for cuts and waste, so check the product recommendation before buying.