Calculator

Flooring Calculator

Enter room dimensions to get square footage, boxes to buy and an installed cost range.

Model reviewed August 2026

Room length(ft)

Room width(ft)

Waste factor(%)

Coverage per box(sq ft)

Flooring type

Flooring to buy

330 sq ft

300 sq ft room + 10% waste

Boxes needed: 14 boxes
Installed cost estimate: $1,785 – $2,730
Underlayment: 300 sq ft

Estimates only. Local pricing, site conditions and code requirements change the real number.

The formula

Boxes = (area x (1 + waste)) / coverage per box

Order 10% extra for straight-lay installations and 15% for diagonal or herringbone patterns, plus extra for future repairs.

Worked example

A 15 x 20 room is 300 sq ft. With 10% waste and 24 sq ft boxes, that is 14 boxes.

Frequently asked questions

How much extra flooring should I order?

Ten percent for straight-lay in a simple rectangular room, 15% for diagonal or herringbone patterns and rooms with many cuts.

How much does flooring installation cost?

Installed pricing typically runs $4-$7 per square foot for LVP and laminate, $10-$16 for tile, and $10-$18 for hardwood.

Sources

Sources & verification

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.