Siding Panels (Vinyl) Count Calculator

Plan siding projects precisely with panel exposure, course counts, and gables per wall segments. Model rectangular walls and triangular peaks, subtracting window and door openings across all faces. Compute per-course panels using length and effective coverage rules accurately. Save presets for projects and reuse later easily. Export clean summaries to CSV and PDF instantly.

Typical vinyl panels are 10–12 ft long.
Face reveal per course; e.g., 7" or 8".
Optional trim allowance at panel ends.
Covers cutting, staggering, handling, and patterning.
Triangles generate extra offcuts; adjustable.
Rectangular Walls
# Width (ft) Height (ft) Quantity Courses Panels/course Panels
Gable Ends (Triangular)
# Base width (ft) Peak height (ft) Quantity Courses Panels (summed)
Gable panels are summed per diminishing course width across the peak.
Openings (Deducted area)
# Width (ft) Height (ft) Quantity Area (ft²)
Openings convert to equivalent panels by area using panel coverage.
Example Data Table
Item Width Height Qty Type Comment
Wall A24 ft9 ft1RectangularMain front elevation
Wall B32 ft9 ft1RectangularRear elevation
Gable 124 ft6 ft1GableOver front elevation
Window4 ft3 ft8OpeningStandard windows
Door3 ft7 ft2OpeningEntry doors
Formula Used
  • Exposure height (ft) = exposure in ÷ 12.
  • Effective panel length (ft) = panel length ft − cut loss in ÷ 12.
  • Panel area coverage (ft²) = exposure ft × effective panel length ft.
  • Rectangular wall courses = ceil( wall height ft ÷ exposure ft ) [+1 if extra course].
  • Panels per rectangular course = ceil( wall width ft ÷ effective panel length ft ).
  • Panels for rectangular wall = courses × panels/course × quantity.
  • Gable courses = ceil( gable height ft ÷ exposure ft ).
  • Panels for gable = Σi=1..courses ceil( ( base ft × (1 − (i−0.5)/courses) ) ÷ effective panel length ft ) × quantity.
  • Openings equivalent panels = ceil( (Σ openings area ft²) ÷ panel area coverage ft² ).
  • Gable adjusted panels = ceil( gable panels × (1 + gable waste% ÷ 100) ).
  • Grand total panels = ceil( ( rectangular panels − openings equivalent ) + gable adjusted ) × (1 + waste% ÷ 100 ).
How to Use This Calculator
  1. Enter panel length, exposure height, and optional cut loss.
  2. Add rectangular walls with width, height, and quantity.
  3. Add gable ends with base width, peak height, and quantity.
  4. List windows and doors under Openings.
  5. Set waste allowances, then press Calculate.
  6. Export results to CSV or PDF; save a preset for later reuse.
FAQs

Common reveals are 7" or 8". Check the product’s exposed face height, not overall panel height.

Window and door areas convert to an equivalent panel count using panel coverage (exposure × length) and are subtracted from rectangular walls.

Triangular cuts create offcuts that aren’t always reusable. The gable waste percentage accounts for this additional loss.

Some projects include a starter or finishing course; toggle the extra-course option to include this.

Yes. Use the preset tools to store configurations locally in your browser and reload them later.

This tool focuses on panel counts. Include trims, corners, fasteners, and accessories per your project specifications.
Always verify results with manufacturer instructions and local codes.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.