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Flooring / Material planning

Flooring Calculator

Calculate flooring area, extra material and the number of boxes for a rectangular room.

Your project measurements

ft
ft
ft²
%
$

Results update as you type. U.S. units. Defaults are editable planning examples. Use product labels and supplier specifications.

Your material plan

Enter your measurements to see your plan.

A quantity estimate, not a supplier quote. Confirm order increments, delivery and project specifications.

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How this calculation works

Enter measurements above to see the worked calculation.

Round to boxes after adding waste

For a 20 by 12-foot room, net area is 240 square feet. A 10% allowance gives 264 square feet. At 20 square feet per box, you need 13.2 boxes, rounded up to 14. Buying 14 boxes provides 280 square feet; do not add another 10% after rounding.

Layout affects the allowance

The 10% example is editable. A diagonal pattern, irregular perimeter, damaged pieces or a need for future repair stock can change the amount. Check installation instructions and your layout. Calculate separate rooms, then combine area before package rounding if they use the same product.

Make the estimate your own

Measure the actual area, choose your product and update the allowance. Costs use the price you enter. Delivery, tax, labor and preparation are excluded unless this tool has a separate field for them. The result rounds whole packages up; displayed decimal quantities are not supplier order increments.

Before you order

  • Check dimensions and units, including depth and openings.
  • Confirm the selected product’s coverage, yield or density.
  • Ask your supplier about package sizes, minimum orders and delivery access.
  • Keep a copy of your measurements with your material plan.

Method v1.0 · Updated October 12, 2026. Read our methodology.