Metal shingles estimator
Turn sloped ft² into shingle piece counts using the datasheet pieces per square—the way modular metal is actually ordered.
Metal shingle piece count
Stamped or modular profiles ship as individual pieces or small bundles. Pull pieces per square and exposure from the datasheet—do not reuse asphalt bundle coverage here.
Modular piece counts
Discrete stamped/modular pieces—not corrugated sheets or asphalt bundles.
How to Calculate Metal Shingles Estimator Manually
Step 1: Measure Your Sloped Roof Area
For standing seam and exposed-fastener panels that run eave-to-ridge, you need sloped surface length, not plan length. Use: rafter length = run ÷ cos(pitch angle), where run = half the building width for a standard gable.
Step 2: Use the Manufacturer's Effective Coverage Width
A 26" wide corrugated panel typically has only 24" effective coverage after seam or rib overlap. A 16" standing seam panel often has exactly 16" effective coverage. Always order from effective width, not sheet width.
Step 3: Count Panels Across the Eave
Panels across eave = ceil(Eave length ÷ Effective coverage width). For a 40 ft eave with 16" effective coverage: 40×12÷16 = 30 panels across per face.
Step 4: Apply Waste for Cuts, Hips, and Valleys
Simple gable with no cuts: 5–8% waste. Hip roofs, dormers, or L-shaped plans: 10–15%. Corrugated and R-panel cut waste at hips is significant because panel ribs don't always align at diagonal cuts.
Step 5: Add Fastener Count from Manufacturer Schedule
Exposed-fastener systems typically call for 80–100 screws per square (100 ft²) for interior zones, and 120+ per square in edge and corner zones per AISI/FM wind-load schedules. Order screws in full boxes to avoid shortfall.
Metal Shingles Estimator Formulas
- Panel count per face = ceil(Eave length ÷ Effective coverage width) [both in same units]
- Total panels = Panel count per face × Number of identical roof faces × (1 + Waste %)
- Screw count = (Sloped ft² ÷ 100) × Screws per square (from manufacturer schedule) × (1 + contingency %)
Use effective coverage width from the manufacturer's submittal, not the raw coil or sheet width. Wind uplift zones (field, edge, corner) require different fastener densities per ASCE 7 load tables.
Metal Shingles: Piece-Based Estimating With Exposure Tables and Accessory Separation
Manufacturer tables drive the count
Exposure, headlap, and effective module coverage are defined in each manufacturer installation table. This page multiplies measured roofing squares by those published rates and then applies waste for cut-up geometry, which is how real purchase planning is usually done.
Different from corrugated sheet counting
Corrugated workflows use sheet width x length coverage, while metal shingles behave as modular pieces with profile-specific rates. Keeping the method matched to the product avoids conversion errors.
Lineal accessories stay separate
Use the linear foot calculator after field piece count is set to estimate ridge, valley, and eave accessory runs separately from field modules.
Stone-coated vs stamped modular
If your supplier sells cartons by fractional squares with separate hip kits, pivot to the stone-coated steel pricing calculator for better kit-style ordering logic.
Frequently Asked Questions — Metal Shingles Estimator
Pieces per square, waste, accessories, and how this differs from asphalt bundles.
How many metal shingles do I need per square?+
Use the manufacturer’s published pieces per roofing square for that profile’s exposure—multiply by your squares after waste. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.
Are metal shingles counted like asphalt bundles?+
No—asphalt uses ft² per bundle; modular metal uses discrete pieces or small packs tied to exposure tables. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.
Why is waste higher on metal shingles than panels?+
Hips, valleys, and staggered courses burn more cut pieces—teens-percent waste is common on cut-up plans. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.
Do I order starter and ridge with the same count?+
Starters, hip, ridge, and valley are separate SKUs—this tool only totals field shingle pieces. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.
Can I use this for stone-coated steel tiles?+
Stone-coated kits mix field bundles and hip accessories—use the stone-coated calculator when the brand sells by carton + hip LF. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.
Where do I get pieces per square?+
From the install guide or distributor submittal for the exact color and profile you are pricing. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.
Does pitch change piece count if ft² is fixed?+
Sloped ft² already includes pitch in your takeoff; do not apply slope factor twice. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.
How do I measure sloped ft² first?+
Use the main roofing calculator or roof area tools to produce honest deck area before you count pieces. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.
Are screws included in piece counts?+
No—fastener schedules are separate; follow the manufacturer nailing or screw pattern. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions. Recheck dimensions, product coverage, and install requirements before purchase.
Does this estimator approve warranty coverage?+
No—it is quantity math only; underlayment and clip rules still follow the warranty booklet. For better estimating accuracy, cross-check panel coverage, sidelap, and waste factor with your project notes, then confirm fastener layout before final ordering. This keeps your supplier takeoff aligned with real site conditions and reduces costly quantity revisions.