Square Footage Calculator

Whether you're tiling a floor, seeding a lawn, or estimating wallpaper, it's important to figure square footage of the area.
For a Square or Rectangle
 
Length of the room
ft.
Width of the room
ft.

 

Square footage in a square or rectangle
sq. ft.
..................................................

For a Triangle
 
Length of the base, in feet
inches
Length of the height, in feet
ft.

 

Square footage
for a triangle
sq. ft.
..................................................
For a Circle
 
Length of the radius
ft.

 

Square footage
for a circle
sq. ft.

Please note: For your convenience, this calculation has been rounded up slightly.

Important reminder: Every effort has been made to ensure the accuracy of this calculation. But before purchasing materials for any project, please check amounts with your suppliers or contractors.

Helpful Information

A few tips: If an area is rectangular, the method is simple: Round each measurement up to the nearest foot or half foot. Then, multiply length times width. For triangular and circular areas, the calculation is typically more complicated.

To figure the area of a circle, multiply 3.14 (pi) times the square of the radius (the distance from the center of the circle to the circle's outside edge or circumference). To figure the area of a right triangle (that is, a triangle with one 90-degree angle), multiply 0.5 times the base (the short line attached to the right angle) times the height (the long line attached to the right angle). Or, just fill in the blanks above. If an area is irregularly shaped, divide it up into rectangles and right triangles as precisely as possible. Figure the area of each rectangle or triangle, and add up all the figures.