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Flooring is almost always sold with some cutting waste in mind. This calculator adds a waste allowance on top of your raw room area so you order enough material the first time.
How to Use This Calculator
Enter your room’s length and width in feet, and a waste percentage (10% is a common default). Click Calculate to see both the raw area and the amount to actually purchase.
Formula
Flooring Needed = (Length × Width) × (1 + Waste% ÷ 100).
Frequently Asked Questions
How much waste allowance should I use for flooring?
10% is standard for straight-laid floors; diagonal patterns or rooms with lots of cuts may need 15% or more.
Does this work for tile, laminate, and hardwood?
Yes — the area and waste-allowance formula applies to any flooring type sold by square footage.
Should I round up to full boxes?
Yes, always round up to the nearest full box or carton, since most flooring is sold in fixed package sizes.