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constructionClassic tool

Square Footage Calculator

Calculate square footage for rectangular rooms, floors, walls and lots in a fast, practical way.

Use this square footage calculator when you need a quick area estimate for a room, floor, wall or rectangular lot without doing the math manually. It is useful for flooring quotes, paint planning, carpet orders, woodworking layouts and simple measurement checks.

Enter length and width in the same unit, choose feet, inches, yards, meters or centimeters, and the tool returns square feet plus square meters and square yards. If you want extra material for cuts or fitting mistakes, add a waste percentage before you compare totals.

Use the same unit for both dimensions. For L-shaped or cut-out spaces, calculate each section separately and add them together.

Summary Enter length and width to calculate the area.
Square feet —
Square meters —
Square yards —
Area with waste No waste allowance applied.

The waste allowance is optional and meant for planning, not for code or legal measurement.

Use clear inputs to get a more useful result.

How square footage is calculated

For rectangular spaces, the base formula is length × width. If your measurements are in meters, centimeters, yards or inches, the tool converts them first and then shows the final area in square feet.

When a waste margin helps

An extra percentage is useful for flooring, carpet, laminate, paint coverage and other jobs where cuts or layout adjustments create loss. If the space is irregular, break it into smaller rectangles, calculate each section and add the results.