Flooring Square Footage: Waste Factor Guide

Buying flooring is one of the easiest places to overspend or come up short. The math itself is simple — length × width — but skipping the waste factor is what trips up most DIYers. Here's the contractor approach.

The flooring square footage formula

Order Quantity (sq ft) = Length × Width × (1 + Waste %)

Why you need a waste factor

Every flooring install loses material to cuts at walls, around vents, and at doorways. Industry-standard waste factors are:

• Laminate or vinyl plank — 10%
• Hardwood (straight lay) — 10%
• Hardwood (diagonal lay) — 15%
• Tile (straight) — 10%
• Tile (diagonal or herringbone) — 15–20%

Worked example

A 15 × 12 ft living room is 180 sq ft. Add 10% waste: 180 × 1.10 = 198 sq ft. If your flooring is $4.50/sq ft, that's $891.

Pro tips before you order

1. Measure twice. Walls are rarely perfectly square — measure both ends.
2. Buy from the same dye lot. Re-orders months later often don't match.
3. Keep one extra box. Future repairs cost a lot more than $50 of attic storage.

Use the free flooring calculator

Our flooring calculator does the math (including waste %) and estimates cost in one click.