Pitch adjustment
footprint × pitch_multiplierExpands the horizontal footprint into an approximate sloped surface.
Inputs
Adjust the project details to update the estimate.
Planning estimates use standard formulas. Verify quantities with your supplier before ordering.
Estimate
Translate roof geometry into materials.
Adjusted roof area
Surface area after pitch and a waste allowance are applied.
2,398 sq ft
Roofing squares
The 100-square-foot unit used for many roofing orders.
24.0
Shingle bundles
A bundle estimate based on common architectural-shingle coverage.
73
Material-only range
A planning window before labor, tear-off, flashing, or disposal.
$2,878–$6,235
Pitch adjustment: footprint × pitch_multiplier
Estimates use standard planning formulas. Verify quantities with your supplier or contractor before ordering.
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Roofing Calculator
Start with the roof footprint, choose a pitch, and estimate the surface area behind a roofing material order. The result separates coverage from the many extras found in a replacement quote.
Free to use Instant results Planning estimate
How to calculate roof materials
Measure the horizontal footprint, then select the closest pitch. A sloped roof has more surface than the rectangle visible on a plan, which is why pitch must be included.
Simple gable roofs can be approximated with length, width, and pitch. Hips, valleys, dormers, skylights, and multiple roof planes create extra seams and cuts that deserve a professional takeoff.
Roofing material is only one part of replacement cost. Underlayment, flashing, ventilation, decking repairs, permits, tear-off, delivery, and labor should be itemized in the final quote.
Formulas used
Squares
roof_area × 1.10 ÷ 100Adds ten percent for waste and converts square feet to roofing squares.
Bundles
roof_area ÷ bundle_coverageDivides coverage by the product's stated bundle area and rounds up.
Frequently asked questions
What to know before you order.
How many bundles make one roofing square?
Three bundles often cover a square for standard architectural shingles, but always use the product label because coverage is not universal.
Why does pitch affect roof quantity?
A steeper plane contains more actual surface than its horizontal footprint. The pitch multiplier accounts for that difference.
Does this include a roof tear-off?
No. This is a material planning estimate. Tear-off, disposal, labor, flashing, and structural repairs need a local quote.
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