Roofing Calculator
Estimate roof area, squares, shingle bundles, ridge cap footage, and material cost from footprint, pitch, and waste assumptions.
Last updated: 2026-03-25
Roofing calculator
Enter your values
Convert footprint and pitch into a realistic shingle order instead of underestimating roof surface area.
Roofing Order
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Enter roof dimensions, pitch, and waste allowance to estimate squares and bundle count.
Calculation History(0)
Example calculations
Tap an example to prefill the calculator with sample values.
Basic gable roof
6/12 pitch on a 40 x 30 footprint
A common residential roof where pitch and waste drive the shingle order more than footprint alone.
Result: The pitch pushes the roof well above the raw footprint, and bundles round up quickly.
Low-slope ranch
Wide but simpler roof geometry
A broader roof with fewer facets where the bundle count stays driven by surface area rather than complexity.
Result: Fewer valleys reduce complexity, but wide footprints still consume a lot of shingles.
Steeper remodel
Higher pitch with extra roof planes
Steep roofs are where pitch multiplier and extra cuts start to matter materially.
Result: Complex geometry compounds waste, so the shingle order grows faster than footprint suggests.
How the roofing estimate works
The calculator starts with roof footprint and applies a pitch multiplier so the estimate reflects actual sloped roof surface rather than flat building area.
It then adds a small complexity factor for extra roof planes, applies waste allowance, converts the result into roofing squares, and rounds up to full shingle bundles.
Roofing calculator FAQs
How pitch, roof planes, and waste allowance affect bundle counts.
Why isn’t roof area the same as building footprint?
Because slope increases surface area. A steeper roof covers more actual square footage than the rectangle it projects on the ground.
What does a roofing square mean?
One roofing square equals 100 square feet of roof surface. Asphalt shingles are commonly estimated in squares and then converted to bundles.
Should I trust the ridge-cap estimate for cut-up roofs?
Treat it as a planning estimate. Very complex roofs may need a field measurement because hips, ridges, and valleys vary more than a simple plane count can capture.
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