Metal Roof Panel Quantity Calculator
Calculate the number of full-length metal roof panels, total panel length and covered area for one roof slope.
Formula
Planning estimate. Check product specifications and local requirements before purchasing.
Worked example: Metal Roof Panel Calculator
Measurements in this example
| Slope length | 5.5 m |
|---|---|
| Eave length | 10 m |
| Effective panel width | 1 m |
| Waste allowance | 8 % |
Calculated quantities
| Whole panels | 11 |
|---|---|
| Total board length | 60.5 m |
| Area | 60.5 m² |
What to check
This calculation uses: Slope length, Eave length, Effective panel width, Waste allowance. It returns: Whole panels, Total board length, Area.
Split the roof into simple slopes and measure each one. Valleys, hips, dormers and penetrations need separate allowance.
Use full panel lengths only when transport, handling and thermal movement allow them. Confirm effective cover width, not overall width.
Flashing, underlay, ridge pieces, valleys, fasteners and drainage capacity are separate parts of the roof system.
Use the units beside each field. The values in the worked example are starting inputs; replace them with your measurements and the specifications of your material.
Compare alternatives
Open a tool, enter your measured dimensions, then save an estimate. Keep another version if you want to compare products or allowances.