FREE TOOL · Roof Size Calculator
Roof Size and Pitch Calculator
Enter the footprint and the pitch and see the roof area, the number of roofing squares and a rough drainage count.
Four quick steps.
- 01
Enter the footprint
Length and width of the building under the roof, in feet.
- 02
Pick the pitch
The rise per 12 inches of run. A phone level app can help.
- 03
Add overhang
Eaves and rakes add area beyond the walls.
- 04
Read the result
See roof area, squares and an edge-length estimate.
About this tool.
How accurate is it?
It is good for simple gable and hip roofs. Complex rooflines need a measured survey.
Why does pitch matter?
A steeper roof has more surface for the same footprint, so it takes more material and more time to inspect.
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