Use our free roofing calculator to determine how many shingles you need for your roof replacement or new construction project. Enter the roof area or building footprint and pitch to calculate squares, bundles, and underlayment needed. Includes a 10% waste factor for cuts and hip/ridge shingles.
Enter Your Measurements
Results
Roofing Squares
14.8
squares
Shingle Bundles
45
bundles
Actual Roof Area
1,342
sq ft
With Waste Factor
1,476
sq ft
Underlayment Rolls
4
rolls
Formula
How to Use This Calculator
How to Use
- 1
Enter the length of the roof in feet (the eave-to-eave measurement).
- 2
Enter the width of the roof in feet (the rake-to-rake measurement).
- 3
Enter the roof pitch as rise per 12 inches of run (e.g., 6/12).
- 4
Adjust the waste factor percentage if needed. 10% is standard for simple roofs, use 15% for complex roofs with hips and valleys.
Frequently Asked Questions
Frequently Asked Questions
How many bundles of shingles do I need per square?
What is a roofing square?
How much extra roofing material should I order?
In-Depth Guides
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About This Calculator
This calculator uses the formula: Roof Area = Footprint Area × √(1 + (Pitch/12)²) | Squares = Area with Waste ÷ 100 | Bundles = Squares × 3. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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