How Much Flooring Do I Need?

The number of flooring boxes you need depends on your room area, the box coverage printed on your product label, and how much waste to add for your lay pattern.

The quick formula

Boxes = ceil(Room area × (1 + waste%) ÷ box coverage)

Waste factor by lay pattern

Pattern	Waste to add	When to use
Straight lay (rows parallel to wall)	+10%	Most rooms
Diagonal lay (45° angle)	+15%	Feature floors, small rooms
Complex rooms (L-shape, many cuts)	+15%	Multiple doorways, unusual shapes

Boxes needed by room size (20 sq ft box, straight lay)

Room size	Area	With 10% waste	Boxes needed
8 × 10 ft	80 sq ft	88 sq ft	5 boxes
10 × 12 ft	120 sq ft	132 sq ft	7 boxes
12 × 12 ft	144 sq ft	158 sq ft	8 boxes
12 × 16 ft	192 sq ft	211 sq ft	11 boxes
16 × 20 ft	320 sq ft	352 sq ft	18 boxes

Common box coverages

Flooring type	Typical box coverage	Notes
Vinyl plank (LVP)	20–23 sq ft	LifeProof, COREtec, Pergo
Laminate	20–25 sq ft	Shaw, Pergo, Quick-Step
Engineered hardwood	15–25 sq ft	Varies by board width

Always use the number printed on your specific box. It varies by product.

How to measure your room

Measure length × width in feet for rectangular rooms
For L-shaped rooms: break into two rectangles, measure each, add together
Subtract permanent fixtures (built-in cabinets, closets you won’t floor)
Add your waste percentage

Use the Flooring Calculator with the Irregular shape option for complex rooms.

Frequently Asked Questions

How many boxes of flooring do I need for a 12×12 room?

A 12×12 room is 144 sq ft. With 10% waste for straight lay, you need 158.4 sq ft of flooring. If your box covers 20 sq ft, that is 8 boxes. If your box covers 25 sq ft, that is 7 boxes. Always confirm the box coverage on your product label.

How much extra flooring should I buy?

Buy 10% extra for straight-lay rooms and 15% extra for diagonal patterns or rooms with many cuts (L-shaped, lots of doorways). An extra 10–15% covers cutting waste, future repairs, and measurement errors.

Can I return extra flooring boxes?

Most home improvement stores accept returns of unopened boxes within 90 days. Keep your receipt. Even so, buying 1 extra box for future repairs is smart — dye lots change between manufacturing runs.

How do I calculate flooring for an L-shaped room?

Break the L-shape into two rectangles, calculate each one separately, then add them. Use the Irregular shape option in the Flooring Calculator to add multiple sections automatically.

Does flooring direction affect how much I need?

Yes. Running flooring diagonally at 45° requires 15% waste instead of 10% because the cuts at walls and corners are larger. Straight lay (parallel to walls) uses less material.