Roofing Calculator
Shingle bundles required for a roof.
Amortization schedule
| # | Payment | Principal | Interest | Balance |
|---|---|---|---|---|
Showing first 12 of months.
Growth over time
| Year | Invested | Value |
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Introduction
Roofing Calculator — Shingle bundles required for a roof. Enter Roof area (m²), Waste (%) to get an instant, accurate result.
Formula
Bundles needed = (roof area in ft² / 33.3 ft² per bundle) × (1 + waste%), rounded up — roughly 3 bundles per 100 ft² (one "square").
Step-by-step
- Enter the Roof area (m²).
- Enter the Waste (%).
- Click Calculate to see your result instantly.
Real-world example
Example: With Roof area (m²) = 100, Waste (%) = 10, the Roofing Calculator gives Bundles Needed: 36.
Frequently Asked Questions
What is a roofing "square"?
100 square feet of roof area — a standard unit in roofing, typically covered by about 3 bundles of shingles.
Should I account for roof pitch?
Enter the actual sloped surface area, not the flat footprint, for an accurate estimate.
What inputs does the Roofing Calculator need?
You'll need to provide: Roof area (m²), Waste (%). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Roofing Calculator?
The Roofing Calculator applies the formula exactly as calculated — Bundles needed = (roof area in ft² / 33.3 ft² per bundle) × (1 + waste%), rounded up — roughly 3 bundles per 100 ft² (one "square"). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Roofing Calculator free to use?
Yes, the Roofing Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Roofing Calculator
The Roofing Calculator uses a real, verifiable formula — Bundles needed = (roof area in ft² / 33.3 ft² per bundle) × (1 + waste%), rounded up — roughly 3 bundles per 100 ft² (one "square"). — so results are accurate every time, not an approximation.