Metal Roofing Material Calculator

Count panels for each rectangular roof plane, with a separate list for trim and fastening.

Your measurements

Editable example

Use the unit on each label. You can also type feet and inches with ft and in, or the marks on your tape measure.

Roof plane 1

Slope length (ft)Eave length (ft)

Length unitsChanges the dimensions labeled ft or m without a fixed unit. Thickness, openings and package sizes keep the inches, square feet, cubic feet and gallons shown on their labels.Panel width before side lap (in)Side lap (in)If your supplier gives installed coverage width, use that width and leave the side lap at zero.

Package sizes, prices and materials

Extra for cuts (%)Eave trim length (ft)Usable eave trim per piece (ft)Rake trim length (ft)Usable rake trim per piece (ft)Ridge caps length (ft)Usable ridge caps per piece (ft)Hip caps length (ft)Usable hip caps per piece (ft)Valley trim length (ft)Usable valley trim per piece (ft)Pipe boots from your planVent flashings from your planChimney flashing kits from your planFasteners per panelYour price per panel ($)

Example: replace these measurements

Your material list

16 full-length panels

640 sq ft measured

Shopping list & save options

Panels before extra: 14
Usable panel width: 36 in
Roof plane area: 640 sq ft
Panel lengths: 16 ft
Eave trim pieces: Enter measured length and usable coverage
Rake trim pieces: Enter measured length and usable coverage
Ridge-cap pieces: Enter measured length and usable coverage
Hip-cap pieces: Enter measured length and usable coverage
Valley trim pieces: Enter measured length and usable coverage
Pipe boots: Enter count from your plan
Vent flashings: Enter count from your plan
Chimney flashing kits: Enter count from your plan
Fasteners before spares: Enter fastening schedule
Panel subtotal: Add your price

Shown area and direction, schematic. The lines are not a cutting, fastening or installation plan.

The calculation

36 − 0 = 36 in usable panel width
Plane 1: ceil(40 × 12 ÷ 36) = 14 panels, each 16 ft long.

Before ordering, use the roof measurement, waste & material handoff guide to check the inputs and take the right questions to the supplier. Choose another calculator.

How to plan the quantity

Measure each roof plane from ridge to eave along the slope. Measure the eave across the bottom. This is different from the horizontal footprint used for shingles.

Panel width minus side lap gives the width that covers the roof. If you already have installed coverage width, enter it with no additional lap deduction. This tool uses full-length panels; end-lapped panels need a supplier schedule.

Enter measured eaves, rakes, ridges, hips and valleys separately, with the usable coverage of each trim piece after overlaps. Keep pipe boots, vent flashings and chimney kits separate using the counts on your roof plan.

Before you order

Panel profile, slope suitability, laps, clips, screw pattern and penetrations are product-specific. Enter their requirements from the selected system.
This counts rectangular planes without nesting offcuts. Hip and valley cuts need a panel schedule from the roof plan.