Metal Roofing Panel Coverage Chart
To figure out how many metal panels you need: divide your roof or wall width by the panel's net coverage width, then round up. Net coverage is the width a panel actually covers after overlap - it's always less than the physical panel width on lapped profiles.
Metal Panel Coverage Chart by Profile
| Panel Profile | Net Coverage | Panels Needed | Typical Use |
|---|---|---|---|
| Standing Seam (Snap-Loc / Seam-Loc) | 12", 16", or 18" | Roof width ÷ panel coverage | Architectural roofs, snow country |
| Classic Rib / Pro-Panel II | 36" net | Roof width ÷ 3 ft | Residential and ag roofing |
| PBR / R-Panel | 36" net | Roof width ÷ 3 ft | Commercial roofing and siding |
| 7/8" Corrugated | 32" net (37" wide) | Roof width ÷ 2.67 ft | Rustic siding, wainscot, roofs |
| U-Panel | 36" net | Roof width ÷ 3 ft | Liner panels, interior walls |
How to Calculate Panels for a Roof
Example: a gable roof section 40 feet wide using Classic Rib (36" net coverage). 40 ft ÷ 3 ft = 13.3, round up to 14 panels per side, 28 total for both sides. Panel length equals the eave-to-ridge measurement plus overhang - panels are cut to length, so there's no end-lap waste on runs under about 45 feet.
For standing seam at 16" coverage on that same 40 ft width: 40 ft ÷ 1.333 ft = 30 panels per side.
Don't Forget Trim and Accessories
Every roof also needs ridge cap, eave/drip edge, rake trim, and fasteners or clips - and valleys, penetrations, and sidewalls need flashing. Pro Form Metals fabricates all trim in-house in Reno and can take off a complete panel-and-trim package from your measurements or plans. Send us your dimensions for an exact count and quote.
Common Panel Coverage Questions
How many square feet does one metal roofing panel cover?
A 3-foot-coverage panel (Classic Rib, PBR) covers 3 sq ft per foot of length - a 16-foot panel covers 48 sq ft. A 16" standing seam panel covers 1.33 sq ft per foot of length, so the same 16-foot length covers about 21 sq ft.
Should I order extra panels for waste?
Metal panels are cut to length, so waste is far lower than shingles. On simple gable roofs, order the exact count plus one or two spares. Hips, valleys, and dormers create angled cuts - add 5-10% on complex roofs.
What's the difference between panel width and coverage width?
A 7/8" corrugated panel is 37" wide but covers only 32" after side overlap. Ordering by physical width instead of coverage width leaves you short - always use net coverage.