Square Footage Calculator

About This Tool

Square footage is the standard measurement for area in the United States, used for everything from real estate listings and rent pricing to home improvement projects and landscaping. Knowing the exact square footage of a space is essential for accurately ordering materials, comparing costs, and planning layouts. This calculator handles the four most common shapes you will encounter in residential and commercial spaces.

How to Measure for Accuracy

For the most accurate results, measure each dimension at least twice using a tape measure. Measure at floor level, as walls may not be perfectly vertical. For rooms with irregular shapes, break them into simpler shapes (rectangles, triangles) and add the areas together. Use the L-shape mode for common room configurations with an alcove or closet extension.

Common Uses for Square Footage

Flooring: Hardwood, tile, carpet, and laminate are all sold by the square foot. Add 10% to your calculated area for waste and cuts. Painting: One gallon of paint typically covers 350-400 sq ft. Measure wall area (length x height) rather than floor area. Real Estate: Price per square foot is the standard comparison metric. Landscaping: Sod, mulch, gravel, and pavers are priced per square foot or square yard.

Conversion Reference

1 square foot = 0.0929 square meters. 1 square yard = 9 square feet. 1 acre = 43,560 square feet. For quick mental math, multiply square feet by 0.111 to get square yards, or by 0.093 to get square meters.