Square footage and material calculator

Area is the easy part. The part that costs money is forgetting the waste allowance and being one box short on a Friday afternoon.

ft
ft
%

Cuts, offcuts, breakage

sq ft

Per box, roll, bundle or gallon

$

Order this many

15 units

Area384 sq ft
With waste422.4 sq ft
Material cost$720.00
Squares (100 sq ft)4.22

For a room with an irregular shape, split it into rectangles and add the results together. Squares are shown for roofing, which is usually ordered that way.

Questions people ask

What waste allowance should I use?

It depends on the material and the layout. Diagonal and herringbone layouts waste more than a straight lay; a room with a lot of cuts wastes more than a square one.

How do I handle an odd-shaped room?

Split it into rectangles, run each one, and add the results.

What is a square?

100 square feet. Roofing is usually ordered in squares, so it is shown alongside the square-foot figure.

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