Metal roofing material calculator

Count metal panels using effective cover width and any end overlap along the slope.

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Roof plane width across panels

Slope length along panels

More inputs and assumptions

Effective panel cover width

Panel stock length

End lap when rows join

Answer

…

Count metal panels using effective cover width and any end overlap along the slope.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

Across count = ceiling(width/cover width); rows = ceiling((slope length − lap)/(stock length − lap)). No offcut reuse, penetrations, flashing, trim, fastening or structural specification. Use actual manufacturer coverage and permitted laps.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Metal roofing material calculator

Count metal panels using effective cover width and any end overlap along the slope.

Next: Roofing calculator

A worked example

Example inputs: roof plane width across panels = 10, slope length along panels = 5, effective panel cover width = 1, panel stock length = 3, end lap when rows join = 0.2. Panels for one rectangular roof plane = 20.

Before you use the result

Example results for roof plane width across panels

These examples use Slope length along panels: 5; Effective panel cover width: 1; Panel stock length: 3; End lap when rows join: 0.2. They are reference calculations, not recommended settings.

Roof plane width across panels	Panels for one rectangular roof plane
5	10
10	20
20	40

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