Convert building footprint and roof pitch into order area, then apply bundles per square and waste.
Results use your measurements and editable assumptions. Verify product coverage, density, waste and order rounding with the supplier before purchasing.
Bundles = roofing squares × bundles per square, rounded up.
BuildCalc converts measurements to a consistent internal unit, applies your project geometry and only then adds the selected waste allowance. Packaging quantities are rounded up because partial bags, blocks or boxes usually cannot be ordered.
Use this estimator after confirming the roof planes and pitch from plans or safe measurements. The calculator turns sloped area into roofing squares, then applies the package rate you enter. Product coverage for field shingles, starter and ridge materials should be checked independently.
At a 6-in-12 pitch with 12% waste, the example footprint produces about 15.03 roofing squares. If the selected shingles require three bundles per square, the field-shingle estimate rounds up to 46 bundles.
No. Packaging varies by product and design. Enter the bundles-per-square value from the manufacturer rather than assuming three.
Valleys, hips, dormers, short courses and pattern alignment create more cuts and unusable offcuts than a simple rectangular plane.
Published and maintained by EasyTool.me. Review the calculation methodology, verify product-specific values with the supplier, and report reproducible corrections. Last materially reviewed August 16, 2026.