Enter your Roof Length, Roof Width, and Roof Pitch, along with your Panel Length, Panel Width (Exposed), and Waste Percentage to calculate the Panels Needed for your metal roof — plus your Roof Area, Roofing Squares, and an optional Estimated Material Cost if you add a Price Per Panel.
Panels Needed
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Roof Area
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Roofing Squares
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Estimated Material Cost
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Measure the length and width of your roof at the longest and widest points. For sloped roofs, measure along the slope, not the horizontal distance. Include any overhangs in your measurements for accurate panel calculations.
Common metal roofing panel widths range from 24 to 36 inches (exposed coverage), with lengths typically available from 8 to 40 feet. The most common panel width is 36 inches with varying lengths to match your roof dimensions.
Generally, add 10-15% waste for most roofing projects. Complex roofs with many cuts, angles, or obstacles may require up to 20-25% waste. Simple rectangular roofs may only need 5-10% waste factor.
Steeper roof pitches increase the actual roof area compared to the ground footprint. The calculator uses pitch multipliers to determine the true roof area, ensuring you order the correct amount of material.
Besides panels, you'll need ridge caps, eave trim, gable trim, screws or fasteners, underlayment, and flashing. These accessories typically add 15-25% to your total material costs.
In many cases, yes. Metal roofing can often be installed over one layer of existing asphalt shingles, which can save on removal costs. However, check local building codes and manufacturer requirements first.
One roofing square equals 100 square feet of roof area. Divide your total roof area by 100 to get the number of squares. This is a standard unit used in the roofing industry for estimating materials and costs.
Metal roofing material costs typically range from $3-12 per square foot, depending on the metal type, panel style, and quality. Steel panels are usually the most economical, while copper and specialty metals cost more.