Metal Roof Calculator

A metal roof typically costs $9 to $16 per square foot installed for steel or aluminum, or $900–$1,600 per roofing square. On a 2,000 sq ft footprint at a typical pitch, that works out to roughly $20,000–$36,000. Standing seam runs at the higher end; zinc and copper can reach $22–$40 per square foot.

Divide your roof's width by the panel's effective coverage width (commonly 12"–19" for standing seam) to get panels needed per course, then run each panel the full length of the roof slope. Add 5–10% for waste and cutting mistakes.

Multiply your building footprint by the pitch's area multiplier (a 6/12 roof adds about 11.8%), then divide by 100. A 2,000 sq ft footprint at 6/12 pitch is about 2,236 sq ft of roof, or roughly 22.4 squares.

Into wood purlins or rafters, use 1.5"–2" self-tapping screws penetrating at least 1" into solid wood. Into light-gauge steel purlins, use 1"–1.25" self-drilling screws rated for your steel thickness. Add roughly 0.75"–1" if installing over one existing layer of shingles.

A common planning figure is roughly 1.5–2 screws per linear foot of panel at each purlin or rafter, though exact spacing depends on your panel manufacturer and local wind-load code. Concealed-fastener systems like standing seam use far fewer exposed screws than through-fastened panels.

Metal roofing weighs roughly 1.0–2.0 lbs per square foot depending on material and gauge — lighter than asphalt shingles at 2.5–4.0 lbs per square foot. Multiply your roof area by the material's weight-per-sq-ft for a total roof weight figure.

Most metal panel systems are rated for a 3:12 minimum slope, though some sealed standing seam systems can go as low as 0.5:12 to 1:12 with additional seam sealant. Always check your specific product's manufacturer rating.

Yes. Simple gable roofs waste only 5–10% of material; hip roofs raise that to 10–15% due to angled cuts at each hip; complex roofs with multiple valleys or dormers can push waste to 15% or more, and standing seam gets disproportionately more expensive on cut-up roofs since it needs long, uninterrupted runs.

It depends on how long you'll stay in the home and how simple your roofline is. Standing seam costs more upfront ($12–$19/sq ft vs. $6–$13 for steel shingles or corrugated) but its concealed-fastener design removes the most common long-term failure point, making it the better choice for long, simple slopes and owners planning to stay 10+ years.

Frequently yes, where local code allows one existing layer and the deck is sound and flat. Metal's lighter weight (roughly 1–1.5 lbs/sq ft vs. 2.5–4 lbs/sq ft for shingles) rarely creates a structural issue, and skipping tear-off saves $0.40–$2.00 per sq ft — but the installer won't be able to inspect the decking underneath for rot.

Yes — labor rates and code requirements (like Florida's hurricane fastening codes, which metal roofing often satisfies well and may qualify for wind-mitigation insurance credits) shift pricing 10–25% from the national average in either direction. See the regional table above.

Corrugated steel runs $6.00–$8.15/sq ft; steel shingles and standing seam run $9–$19/sq ft; aluminum runs $11–$16/sq ft; zinc and copper run $18–$40/sq ft. All figures include installation.