Flooring Calculator

How to measure for flooring

1. Measure each room’s length and width in feet at the widest points.
2. Multiply length × width to get square feet, and add the rooms together.
3. Split L-shaped rooms into rectangles and enter each one.
4. Add 10% for cuts and waste (15% for diagonal or patterned layouts).
5. Divide by the coverage per box and round up.

Worked example

A 12 × 14 ft living room (168 sq ft) plus a 10 × 10 ft bedroom (100 sq ft) is 268 sq ft. Adding 10% gives 294.8 sq ft, which is 15 boxes at 20 sq ft per box. At $3.50 per sq ft, 300 sq ft of flooring costs $1,050.

Buy all boxes from the same production lot so the color matches, and keep a spare box for future repairs.

Frequently asked questions

How much extra flooring should I buy?

Usually 10%. Use 15% or more for diagonal patterns, herringbone or rooms with many corners.

How do I measure a room with a closet?

Measure the closet as its own rectangle and add it as a separate row.

How do I convert square meters to square feet?

Multiply by 10.764. 20 m² is about 215 sq ft.

Does this include underlayment and trim?

No. Underlayment usually covers the same area as the flooring; trim is measured by the room perimeter.