Metal Roofing Calculator
Metal panels and screws for a roof.
Enter your values
ⓘ Live results
Results
- Panels needed
- 15
- Roof area
- 1200 sq ft
- Screws needed (~1.3/sq ft)
- 1,560
- Panel length to order
- 30 ft each
Quick answer
Panel count is roof area divided by the effective coverage width of each panel, plus waste for overlaps and cuts.
panels = ceil(roof width / effective panel coverage width)
How to use the Metal Roofing Calculator
- 1Measure the sloped roof length (eave to ridge) and the width to be covered.
- 2Check the effective coverage width of your metal panel after overlap.
- 3Add 5-10% waste for hips, valleys and end cuts.
Worked example
Using the values the calculator loads with:
Inputs
- Roof slope length30 ft
- Roof width40 ft
- Panel coverage width3 ft
- Waste allowance10 %
Results
- Panels needed15
- Roof area1200 sq ft
- Screws needed (~1.3/sq ft)1,560
- Panel length to order30 ft each
Frequently asked questions
Do I need underlayment under metal roofing?
Yes, a synthetic or felt underlayment is standard beneath metal panels.
How many screws per panel?
Roughly 1.3-1.5 screws per square foot including ribs and end laps, more at eaves and ridges.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.