Square Footage
Area for rectangle, triangle, trapezoid, circle.
Example
You enter
- Shape rectangle
- Length (ft) 10
- Width (ft) 12
You get
- Area (ft²) 120
Checked against published worked examples from: Bob Vila (bobvila.com); OpenStax (Rice University).
Details, formula, and sources
Formula or tableArea = length × width (rectangle) and triangle / circle / sector for non-rectangular plans.
Source and editionClassical geometry; the IRC / IBC floor-area definitions by name (no code value enters the area).
Free accessFree read-only access at codes.iccsafe.org.
What governsEstimate. AHJ and licensed professional govern.
API field namesshape, length_ft, width_ft, area_ft2