Roofing calculator: squares from roof pitch

Put in the footprint and the pitch. Get the roof area along the slope and the squares.

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How it works out

A sloped roof covers more than the ground under it. The tool multiplies the footprint by the pitch factor to get the roof area along the slope. A square is 100 sq ft, so the squares are the roof area divided by 100. If you add waste, it goes on top of the squares.

A 2,000 sq ft footprint at 6/12 is about 2,240 sq ft of roof.

Pitch	Pitch factor
1/12	1.003
2/12	1.014
3/12	1.031
4/12	1.054
5/12	1.083
6/12	1.118
7/12	1.158
8/12	1.202
9/12	1.250
10/12	1.302
11/12	1.357
12/12	1.414

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Questions

How do I get squares from the footprint?

Multiply the footprint by the pitch factor, then divide by 100. Put the footprint and the pitch in above and the tool does both.

What's a pitch factor?

It's how much bigger a sloped roof is than the flat ground under it. The steeper the pitch, the bigger the factor. A flat roof's factor is 1.

Does this add waste?

Only if you put it in. Type your waste percent and you get squares with waste beside the plain squares.