Shingle Calculator
Use this free Shingle Calculator to estimate roofing squares, shingle bundles, and waste for your roofing project.
How Many Shingles Do I Need?
The number of shingles needed depends on your roof area and waste factor. Most asphalt shingles require approximately 3 bundles per roofing square.
Shingle Calculator Formula
Adjusted Area = Roof Area × (1 + Waste %)
Roofing Squares = Adjusted Area ÷ 100
Bundles Needed = Roofing Squares × 3
Example Calculation
- Roof Area: 2,000 sq ft
- Waste: 10%
- Adjusted Area: 2,200 sq ft
- Roofing Squares: 22
- Bundles Needed: 66
Common Roofing Waste Factors
| Roof Type | Recommended Waste |
|---|---|
| Simple Gable Roof | 10% |
| Hip Roof | 15% |
| Complex Roof | 15% - 20% |
FAQ
How many bundles are in one roofing square?
Most asphalt shingles require 3 bundles per roofing square.
What is a roofing square?
A roofing square equals 100 square feet of roof area.
How much waste should I add?
Most roofing contractors recommend 10% waste for standard roofs and 15% to 20% for complex roofs.