Roof Calculator
Estimate roof surface area, shingle bundle counts, and pitch multipliers. Input building footprint and roof pitch for accurate contractor layouts.
Interactive Calculator
1. Provide Details
ft
ft
ft
2. Output Results
Calculations Performed Automatically
How to Calculate: Formula & Steps
Multiplies flat footprint area (including overhangs) by the slope hypotenuse factor.
Formula Used:
Roof Area = Ground Footprint Area × Pitch FactorStep-by-Step Calculation Example
Footprint of 1,000 sq ft under 6/12 pitch (factor 1.118) yields a roof area of 1,118 sq ft.
Common Mistakes to Avoid
- Forgetting to account for eave overhangs.
Practical Use Cases
- Estimating roofing material ordering
- Checking contractor bids
Expert Tips
- Add 10% shingles waste for gable roofs, and 15% for hip roofs.
Frequently Asked Questions About Roof Calculator
How many shingle bundles cover a square?
There are 3 shingle bundles in 1 roofing square (100 sq ft).
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