Roofing Calculator
Calculate roof area, pitch factor, squares and shingle bundles.
Enter your values to see the result.
Estimates only. Measure carefully and check quantities with your supplier before ordering.
Continue your work
- Plywood Calculator — Estimate roof sheathing.
- Siding Calculator — Estimate the walls.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Roofing Calculator
Calculate roof area, pitch factor, squares and shingle bundles.
- 1 Enter the house length, width and eave overhang.
- 2 Choose the roof pitch and waste.
- 3 Read the roof area, squares and materials.
Example and practical tips
A 40 × 30 ft house with a 6/12 pitch and 12 in overhang has about 15.4 squares including waste, about 47 bundles of shingles.
Frequently asked questions
What is roof pitch?
The rise in inches for every 12 in of run; 6/12 rises 6 in per foot.
How many bundles per square?
Three bundles of standard architectural shingles cover one square.
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