Roofing Calculator
Convert roof area into shingles and bundles.
Calculate roof shingle calculator from clear inputs
Roof Shingle Calculator gives a focused worksheet for home & diy questions where a quick deterministic estimate is more useful than a spreadsheet. The roof shingle calculator fields mirror the variables in its formula, and the output separates the main result from supporting values so you can sanity-check this calculation before reusing it.
1800 square feet with 12 percent waste equals 20.16 squares and 61 bundles at 3 per square.
Keep the estimate private in your browser
For Roof Shingle Calculator, every calculation runs in your browser with no upload, account, cookie, live lookup, or server-side storage. The roof shingle calculator result is best treated as a planning number because the real-world constraints behind this estimate can change the answer. Adjust the roof shingle calculator assumptions and confirm important decisions against the relevant source of truth for that exact situation.
Frequently Asked Questions
What is a roofing square?
100 square feet of roof. 1,800 sq ft with 12% waste is 20.16 squares, which at 3 bundles per square needs 61 bundles.
How much waste should I add?
About 10% for a simple gable roof and 15% or more for hips, valleys, and dormers, since those need more cutting.
Does it include starter strips and ridge caps?
No. Starter shingles and ridge or hip caps are usually bought separately, measured by linear feet of eaves and ridges.
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