Roofing Calculator
Estimate roof area, roofing squares, and bundles.
This page is an editable estimator with realistic defaults so you can model your own situation in minutes.
Roof area = footprint area x pitch factor.
Roofing squares = roof area / 100.
| Footprint | 1,120 sq ft | |
|---|---|---|
| Waste | 10% |
Assumptions
- Measure actual site dimensions before ordering.
- Waste factors, cuts, overlaps, compaction, and product coverage vary by material and installer.
- Confirm quantities with plans, local code, supplier guidance, and manufacturer instructions.
How this calculator works
Formula used
Roof area = footprint area x pitch factor. Roofing squares = roof area / 100.
Example calculation
Plug in your own numbers and the result updates instantly. Roof area = footprint area x pitch factor. Roofing squares = roof area / 100.
Roofing Calculator FAQ
Is this roofing calculator exact?
No. It is an estimating tool only. Actual quantities can change with field measurements, waste, layout, product dimensions, building codes, soil conditions, and installer methods.
Should I add extra material?
Usually yes. Many projects use a waste factor for cuts, breakage, overlap, spillage, grading, or mistakes. The best waste factor depends on the material and layout.
Should I verify before ordering?
Yes. Confirm quantities with your contractor, supplier, plans, local code requirements, and product installation instructions before purchasing materials.