Calculate the square footage and square meters of any room, lot, or area. Supports rectangles, triangles, circles, L-shapes, and trapezoids in feet, inches, meters, centimeters, and yards.
Square footage of a home is the sum of all floor areas at grade level. Basements, garages, and unconditioned spaces often excluded from "living area." Always verify with the listing agent.
Add 5-10% for waste and cuts. A 200 sq ft room needs 210-220 sq ft of material. Diagonal layouts or herringbone patterns need 15% extra.
Square footage of a lawn determines how much seed, sod, or fertilizer to buy. Standard rate: 1 lb of grass seed per 1000 sq ft for new lawns, 0.5 lb for overseeding.
Walls are measured in linear feet \u00d7 height, then multiplied. One gallon covers ~350 sq ft of wall. Subtract windows and doors (each ~15-20 sq ft).
Select rectangle, triangle, circle, trapezoid, or sector. Each shape uses the right area formula: length x width for rectangles, pi x r^2 for circles, etc.
Type dimensions in feet, inches, meters, centimeters, or yards. The calculator converts and computes area in your chosen units.
Get the result in square feet, square meters, square yards, and acres. Useful for flooring, paint, real estate, and landscaping projects.
For related calculations, try our concrete calculator.
FAQ
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A square footage calculator is a free tool that finds the area in square feet and square meters for any room, lot, or shape. Our square footage calculator supports rectangles, triangles, circles, L-shapes, and trapezoids in feet, inches, meters, centimeters, or yards. The square footage calculator is used for flooring, paint, landscaping, and real estate.
How it works
Our square footage calculator lets you find the area in square feet and square meters for rectangles, triangles, circles, L-shapes, and trapezoids, in three steps.
Choose Rectangle, Triangle, Circle, L-Shape, or Trapezoid from the Shape dropdown. Pick the unit you measured in: feet, inches, meters, centimeters, or yards. The result converts to square feet and square meters automatically.
Type the dimensions of the area. For rectangles, enter length and width. For triangles, enter base and height. For circles, enter radius. For L-shapes, enter both outer rectangles. For trapezoids, enter both bases and the height.
The result shows square feet, square meters, and the perimeter. Use the area for flooring, paint, landscaping, or real estate listings. Use the perimeter for trim, fencing, or border materials. The share button creates a link with your inputs filled in.