Square Footage from Room Dimensions

Enter length L and width W in the same selected unit, feet or meters. Area A = L × W in ft² or m². For feet, the calculator multiplies ft² by 0.092903 to display m²; for meters, it multiplies m² by 10.7639 to display ft².

With feet selected, 12 ft × 10 ft = 120 ft². The calculator displays 11.15 m² after rounding 120 × 0.092903 to two decimals.

This is the area of one rectangle. It does not subtract doorways, alcoves, fixtures, or openings, and it does not include a cutting or waste allowance. Divide irregular floors into rectangles and add their areas. Check the actual dimensions before buying material.

Measure the longest and widest boundaries that the material must cover, then subtract openings only when the product is sold by net covered area. Flooring often needs cuts around walls and fixtures; choose any extra material from the installation plan rather than treating the geometric area as a purchase quantity. If the room has a recess, measure it as a second rectangle.

Related calculators: Cubic Yards from Length, Width, and Depth, Gravel Volume, Weight, and Cost Estimator, Sand Volume and Weight from Metric Dimensions, Concrete Volume and Bag Calculator for Rectangular Pours.

• NIST — area and volume geometry
• NIST Guide to the SI — unit conversion factors

Last reviewed: 2026-09-28.