What is the Roofing Calculator?
Estimate roof area, roofing squares and shingle bundles from footprint and pitch. Order the right amount the first time. These construction and DIY calculators estimate materials for common home projects and include sensible waste allowances.
How to use the Roofing Calculator
- Enter your house length, your house width, your overhang, your roof pitch.
- Results update automatically as you type; you can also press Calculate.
- Read the output: roof area, roofing squares, shingle bundles (3/square + 10%).
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With house length = 40 ft, house width = 30 ft, overhang = 1 ft, roof pitch = 6, the Roofing Calculator returns roof area: 1,503 ft²; roofing squares: 15.03; shingle bundles (3/square + 10%): 50.
Tips for better results
- Add 5–15% for waste, cuts and breakage depending on the material.
- Measure twice and round up when buying — returns are easier than second trips.
- Coverage figures vary by product, so check the label or spec sheet.
⚠️ Material estimates are approximate. Follow local building codes and manufacturer instructions.
Frequently asked questions
What does the Roofing Calculator do?
Estimate roof area, roofing squares and shingle bundles from footprint and pitch.
How is it calculated?
The Roofing Calculator uses this method: Area = footprint × √(1 + (pitch/12)²); 1 square = 100 ft².
Can you show an example?
With house length = 40 ft, house width = 30 ft, overhang = 1 ft, roof pitch = 6, the Roofing Calculator returns roof area: 1,503 ft²; roofing squares: 15.03; shingle bundles (3/square + 10%): 50.
Is the Roofing Calculator accurate?
It uses standard published formulas and is tested against known values, but results are estimates for guidance. Material estimates are approximate. Follow local building codes and manufacturer instructions.
Is this tool free and private?
Yes — the Roofing Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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