Watt and Wall

Renovation calculator

Flooring and Tile Calculator

Estimate the floor area, waste-adjusted material area, and whole cartons, packs, sheets, or tiles needed for a simple rectangular space.

Your floor and product

Estimate flooring or tile quantity

All fields are required. Measurements use feet and square feet; values stay in this browser.

Floor dimensions

Measure the longest side of the rectangle.

Measure the other side of the rectangle.

Product coverage and waste

From the carton or product listing.

Common starting point: 5%–10%.

Live estimate

Estimated flooring quantity

Updated estimate: 6 units suggested for 132 square feet after waste.

Suggested units to buy

6 units

Rounded up after 10% waste

Required floor area
120 sq ft
Waste allowance
12 sq ft
Adjusted area
132 sq ft
Coverage per unit
23.21 sq ft

Plan for about 132 sq ft of material after waste, which is 6 whole units at your entered product coverage.

Planning estimate only. Layout, cuts, pattern, defects, cartons, and product instructions can change the final quantity.

Transparent calculation

Flooring quantity formula

Measure a rectangular floor, add the waste allowance for cuts and replacements, then divide by the coverage printed on one product unit.

Required area = length × width

Waste area = required area × waste % ÷ 100

Adjusted area = required area + waste area

Units to buy = round adjusted area ÷ coverage per unit up

Worked example

For a 10 ft × 12 ft floor, a product covering 23.21 sq ft per unit, and 10% waste:

Required area
120 sq ft
Adjusted area
132 sq ft
Whole units
6 units

Flooring quantity questions

Enter the square feet covered by one carton, pack, sheet, or individual tile as shown on the product listing or carton. Do not enter the total coverage of several cartons.