Flooring Calculator

How to use this calculator

Enter Length (ft), Width (ft), Waste allowance (%), Coverage per box (sq ft). The result updates in your browser as you edit an input. The prefilled values are examples only.

How the estimate works

Multiply length by width, add a waste allowance, and round the number of whole boxes up.

What can change the answer?

Irregular rooms, diagonal layouts, damaged boards, and pattern matching increase offcuts. Box coverage and return policies differ by product, so plan purchases around the exact material.

Before relying on the result

Check the exact box coverage and use an allowance appropriate to the installation plan. The displayed area already includes the waste percentage entered, and the whole-box count adds packaging rounding. Avoid adding the same allowance twice. Measure irregular rooms in separate non-overlapping sections before totaling material quantities.

Worked example with the default inputs

A 12-by-10-foot floor is 120 square feet. Adding 10% gives 132 square feet. At 20 square feet per box, 6.6 boxes becomes seven whole boxes, supplying 140 square feet.

Interpret the result in a planning record

Use the flooring calculator to turn length and width into floor area, add an adjustable waste allowance, and round up to whole boxes. The allowance should reflect the room shape and installation pattern. Before ordering, confirm the coverage printed on the exact box, the availability of matching stock and the retailer’s rules for returning unopened packs.

Save the input values, units and result together. Change one uncertain input at a time so you can see which assumption moves the answer. A displayed decimal is arithmetic precision, rather than evidence that the measurements or rates are equally precise.

More tools

Read the How to Measure a Project Before Buying Materials guide →