Calculate the number of shingle bundles needed for your roofing project. Accounts for roof pitch, shingle type coverage rates, waste factor, and multiple roof sections for accurate material estimates.
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Planning a roofing project? Our shingle calculator helps you determine exactly how many shingle bundles you need. Account for roof pitch slope correction, shingle type coverage rates, waste factors, and multiple roof sections. Get accurate material estimates for 3-tab, architectural, and premium shingles to avoid over-ordering or costly shortages.
A shingle calculator determines the number of roofing shingle bundles needed based on your roof's dimensions, pitch, and shingle type. It applies a slope correction factor to account for the actual surface area of pitched roofs (which is larger than the flat footprint), adds waste for cuts and errors, and converts to bundles based on shingle coverage rates. Most asphalt shingles cover 32-33 square feet per bundle, with 3 bundles per square (100 sq ft).
Shingle Bundle Formula
Bundles = (Roof Area × Slope Factor × (1 + Waste%)) ÷ Coverage per BundleAutomatically accounts for roof pitch to calculate true surface area, not just flat footprint.
Accurate coverage rates for 3-tab (33.3 sq ft), architectural (32.5 sq ft), and premium shingles (31.5 sq ft).
Includes customizable waste percentage for cuts, damaged shingles, and installation errors.
Calculate for complex roofs with multiple planes, valleys, and dormers.
See results in industry-standard roof squares (100 sq ft) plus total bundles needed.
Quick calculations for common residential roof sizes from small ranch to two-story homes.
Calculate shingle quantities for complete roof tear-off and replacement projects.
Estimate roofing materials during the planning and bidding phase of new home builds.
Determine materials needed for insurance claims and repair work after wind or hail damage.
Verify contractor material estimates and ensure accurate quantities in bids.
Plan material purchases for DIY roof installations on sheds, garages, or small structures.
Estimate project costs by calculating material quantities before requesting contractor quotes.
Calculate shingles for new roof sections added to existing homes.
Estimate materials for small commercial buildings with asphalt shingle roofs.
Multiply your roof area in square feet by the slope correction factor for your pitch, add 10-15% waste, then divide by your shingle bundle coverage (typically 32-33 sq ft). For a 1,500 sq ft flat area with 6:12 pitch (1.118 slope factor): 1,500 × 1.118 × 1.10 ÷ 33 = 56 bundles.