How to Calculate Square Footage for Flooring Projects
Before you buy a single plank or tile, get the math right. Here's how to measure any room shape and avoid running short mid-project.
For a rectangular room, square footage equals length times width (both in feet). A 15×12 ft room is 180 square feet. For irregular shapes, divide the space into rectangles, calculate each separately, then add the totals together. Always add 10% extra for waste from cuts and pattern matching.
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Basic Rectangle Formula
Area = Length × Width
A 15ft × 12ft room = 180 square feet.
Irregular Rooms — Divide and Conquer
For L-shaped rooms or spaces with alcoves, split the area into rectangles. Calculate each section's square footage separately, then add them together for the total.
Circular Areas
Area = π × radius²
Measure the diameter, divide by 2 for radius. A 10-foot diameter circle: radius = 5 ft, area = π × 5² ≈ 78.5 square feet.
Always Add Waste Allowance
Standard recommendation is 10% extra for cuts, mistakes, and pattern matching. For diagonal tile or plank installations, or rooms with many angles, increase to 15%.
Converting to Square Yards
Carpet is often priced per square yard. Divide square feet by 9 (since 1 square yard = 9 square feet). A 180 sq ft room = 20 square yards.
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