Rectangle
Length × width.
Free contractor tool
Square Footage Calculator
Build a project area from multiple simple shapes instead of doing the math one room at a time.
Multiple areasAdd + subtractWaste allowance
Build the area
Add rectangles, triangles and circles. Use a subtraction row for openings, islands or areas that are not part of the job.
Break odd-shaped spaces into simple rectangles, triangles and circles. The total is saved on this device while you work.
Triangle
Base × height ÷ 2.
Circle
π × radius². Enter the full diameter and the calculator handles the radius.