Roof materials
Metal roofing panel quantity calculator
Estimate metal roofing panels. Metal panel replacement or installation.
Try the calculation
Use exposed panel width after overlap.
Adjustable example. Change these illustrative inputs to match your task, then recalculate. Reset restores the example and its result.
Understand the result
How this calculation works
Panel quantity uses exposed coverage after any overlap between adjacent panels.
Steps
- Enter area, panel length and exposed panel width from the product plan.
- Confirm the width is the effective width, not the raw sheet width.
The form starts with the worked example below. Change its values and selections to match your task; Reset restores the example.
Formula
panels = ceiling(area ÷ (panel length × exposed width)).
Variables and units
- Roof area (sq ft)
- Required. Use a positive value. Starting example: 2000. Replace it for your task.
- Panel length (ft)
- Required. Use a positive value. Starting example: 16. Replace it for your task.
- Exposed panel width (ft)
- Required. Use a positive value. Starting example: 2. Replace it for your task.
What the result means
This is a coverage estimate. It does not lay out end cuts, valleys, hips or panel-length optimization.
Worked example
Inputs: Roof area = 2000; Panel length = 16; Exposed panel width = 2.
Calculation: 2,000 sq ft ÷ (16 ft × 2 ft) = 62.5; round up to 63 panels.
Result: 63 panels.
Frequently asked questions
Why use exposed width?
Overlap reduces the area each panel covers.
Does it include a waste allowance?
No, add one in the quantity input if your takeoff requires it.
Can I use different panel lengths together?
Enter one effective coverage assumption at a time.