Free tool · runs in your browser
Area Calculator
Calculate area for rectangles, triangles, circles, and trapezoids — output in square feet, square yards, square inches, and square meters. Free, in your browser.
No signup · nothing uploaded · Free — unlimited use, runs entirely in your browser
How it works
Pick the shape
Rectangle, triangle, circle, or trapezoid.
Enter the dimensions
Feet and inches — diameter for circles, height for trapezoids.
Read the area
Square feet plus yd², in², and m² equivalents.
Pick a shape and enter its dimensions in feet and inches: rectangle or square, triangle, circle, or trapezoid. The result comes back in square feet — the unit most construction quantities are priced in — plus square yards, square inches, and square meters.
Rooms and slabs are rarely a single clean rectangle; break an L-shaped space into two rectangles and add the results. For measuring the area directly off a drawing, the takeoff tools in PDFDepth do it on the sheet itself.
Questions, answered
Split it into two rectangles, calculate each area separately, and add them — the standard approach for any irregular floor plan.
More free tools
Need more than the free limit?
In PDFDepth you trace the area on the drawing itself — calibrated square footage with the measurement list kept per sheet.
Start for Free