Roof Shingle Calculator
Convert roof area into approximate shingle bundle counts with optional waste.
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 and apply waste percentage to estimate bundle quantity.
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.