Roof Shingle Calculator
Uses three bundles per roofing square (100 sq ft). Enter sloped roof area, not footprint, or chain from the roofing calculator mentally.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Enter roof area already adjusted for pitch. Add waste for hips and valleys.
What the math is doing
Bundles = ceil((sq ft × (1+waste)) ÷ 100 × 3).
Frequently asked questions
Architectural vs 3-tab?
Bundle coverage still centers on squares; verify SKU.
Starter strip?
Add linear feet of eaves and rakes separately.
Cap shingles?
Ridge length ÷ bundle coverage per ridge cap pack.
Synthetic underlayment rolls?
Divide roof area by roll coverage.