Roof Shingle Calculator
Calculate how many shingles you need for your roof. Enter your house footprint and roof pitch to get roof area, roofing squares, shingle bundles, and underlayment rolls — including waste for cuts, ridges, and starter strips.
よくある質問
How many bundles of shingles do I need per square?
Three bundles of standard 3-tab or architectural shingles cover one roofing square (100 sq ft). Some heavyweight designer shingles come 4-5 bundles per square, so check the wrapper before ordering.
How do I figure out my roof pitch?
From inside the attic, hold a level horizontally against a rafter, measure 12 inches out, then measure straight down to the rafter. That vertical measurement is your pitch — 6 inches down means a 6/12 pitch. You can also estimate it visually: most homes are 4/12 to 8/12.
How many squares is an average roof?
A typical 2,000 sq ft single-story home has a roof of roughly 22-26 squares once pitch and overhangs are factored in. Two-story homes of the same size have smaller footprints, so their roofs are usually 13-17 squares.
How much waste should I add for shingles?
Add 10% for a simple gable roof and 15% for roofs with hips, valleys, dormers, or skylights. Complex roofs generate more cut waste, and you want leftover shingles from the same lot for future repairs.
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