Plan exact roof-covering packages from measured same-pitch plan area, entered pitch, explicit allowance, exact package coverage, and price.
A quick decision brief for this specific tool
Measured horizontal plan area for same-pitch planes, entered rise per 12, explicit area allowance, exact selected-package coverage and price
Slope multiplier, measured/planned sloped area and roofing squares, whole packages, purchased coverage and entered package cost
Apply the geometric pitch multiplier, then only the entered allowance, and divide by exact installed package coverage
Choose your path
Convert measured same-pitch roof plan area to primary-covering packages using exact product coverage and explicit allowance without producing a roof-system or safety plan.
Audit pitch-adjusted surface area without assuming building floor area.
Enter measured same-pitch plan area, pitch and documented allowance.
Gets transparent measured/planned squares rather than a generic roof recommendation.
Avoid a universal three-bundles-per-square assumption.
Copy installed package coverage and current package price from the selected product/quote.
Gets whole packages and scoped cost tied to that exact coverage.
Keep primary covering arithmetic from hiding critical assemblies and safety.
Use the result only after plane survey, then complete code/product, flashing, ventilation and fall-protection plans.
Does not treat package count as an installable roof system.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.
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Same-pitch horizontal plan area converts to sloped surface using the geometric pitch multiplier.
Sloped area = plan area × √(1 + (rise ÷ 12)²)Only the entered roof-layout allowance expands measured sloped surface area.
Planned area = sloped area × (1 + entered allowance%)Planned area divides by exact installed package coverage and rounds upward to whole packages.
Packages = ceil(planned area ÷ exact package coverage)Updated: August 2026
A homeowner audits same-pitch plan area, slope multiplier and explicit allowance.
An estimator compares package counts only after entering installed coverage for each selected product.
A roofer records primary covering packages while keeping starter, ridge, underlayment, flashing and ventilation takeoffs separate.
Measure every included plane’s horizontal projection and run different pitches separately.
Enter a project-specific allowance and exact selected-package installed coverage.
Measure the horizontal projection of included roof planes and copy exact installed package coverage. This tool adds no universal waste factor or bundles-per-square rule.