Roofing Job Cost & Bid Calculator

How do roof pitch and waste affect a roofing bid?

Multiply footprint area by the pitch factor. Apply waste before dividing by bundle coverage and round up. Add the other project costs, then divide total cost by one minus target margin.

Worked example

A 2,000-square-foot footprint at a 1.12 factor is 2,240 square feet. At 10% waste and 33.3 square feet per bundle, order 74 bundles. At $35 each, shingles cost $2,590.

How this calculator works

1. Choose the scope and enter your unit costs, crew or schedule assumptions.
2. Read the estimated costs and the result based on the inputs above.
3. Compare scenarios before copying or printing your estimate.

Use actual manufacturer coverage. Measure hips, valleys, dormers, and separate roof planes. Include starter, ridge, fasteners, and local installation requirements in the material allowance where applicable.

Last reviewed: November 12, 2026 · Deepak Softech

Frequently asked questions