Flooring hub: square footage, waste and boxes

Quick checklist

1. Divide an irregular floor plan into rectangles; total floor area (sq ft) = sum of length (ft) × width (ft) for every section being covered.
2. Required area (sq ft) = total floor area × (1 + the product/layout waste percentage ÷ 100). Check the flooring maker's guidance; the cited SMARTCORE planner uses 10% for its product.
3. Cartons to buy = round up (required area ÷ sq ft covered per carton on your product label). Do not round each room separately if cartons can be shared.

Sources: SMARTCORE at Lowe's — Flooring project planner and carton calculation

Calculators for flooring projects

• Flooring CalculatorWork out square footage and how many boxes of flooring to order, including waste.
• Home Renovation Cost CalculatorBuild a transparent renovation budget from your own material, labor and contingency inputs.
• Paint CalculatorEstimate paintable wall area and how many gallons of paint your project needs.

In-depth guides

• How Much Flooring Do I Need?

  Measure the room's area, add a waste percentage based on layout (5-20%), then divide by the box's coverage and round up. A 150 sq ft room with 10% waste needing 165 sq ft, at 22 sq ft per box, requires 8 boxes.

Articles from the blog

• How to Measure Square Footage for FlooringFlooring is sold by the box, not the square foot you measured. Here is how to turn room dimensions into a defensible order quantity.

Common questions

How much extra flooring should I buy?

Around 5–10% for straight layouts and 10–15% for diagonal, herringbone or rooms with many angles.

How do I measure an L-shaped room?

Split it into rectangles, measure each, and add the areas together.

Do I include closets?

Yes, if the same flooring continues into them.