Metal Roofing Calculator
Metal roofing lasts 40–70 years and reflects solar heat to reduce cooling costs. This calculator covers corrugated panels (36" wide) and standing seam (24" wide). Enter roof dimensions to get panel count, length per panel, screws, ridge cap pieces, and closure foam strips.
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How to Use This Calculator
- 1Enter your measurements in the fields above. Use the units shown next to each field (ft, in, etc.).
- 2Click Calculate to get your material estimate instantly.
- 3Review the highlighted result — it shows the key quantity you need to order.
- 4Use Copy Results to save your estimate, or bookmark the URL — your inputs are encoded in the link.
Pro tip: Always add 10% to your material order to account for waste, cuts, and defects.
Frequently Asked Questions
How many metal roofing panels do I need for a 1,200 sq ft roof?
A 1,200 sq ft roof with standard 36-inch-wide panels that are 20 feet long each (60 sq ft per panel) requires about 20 panels per side. For a two-sided gable roof, that's approximately 40 panels plus 10% extra for trim = 44 panels total.
Can I put metal roofing over existing shingles?
In most jurisdictions, you can install one layer of metal roofing over one existing layer of shingles without tearing off. Check local code — some areas require a tear-off. Install 1×4 furring strips over the shingles to create an air gap and protect the metal panels from shingle granules.