Fiber Cement Calculator

Panel or lap siding quantities from wall area.

Gross wall area (sq ft)

Product type (0=lap, 1=panel, 2=shake)

Lap exposure (in)

Plank length (ft)

Window/door openings (sq ft)

Waste allowance (%)

Tab to move between fields

Pieces/panels to order

205

Paint/primer (gal)

Squares (100 sq ft)13

Net siding area (sq ft)1,300

Nail boxes (1 lb)10

Trim (LF)130

Caulk tubes6

How to Use This Calculator

Enter Gross Wall Area in sq ft before openings, then set Product Type (lap, panel, or shake).
For lap siding, set Lap Exposure and Plank Length to match your product; for panels, defaults apply.
Enter Window/Door Openings to subtract, and Waste Allowance (10% typical).
Read Pieces/Panels to Order, Squares Needed, Nail Boxes, Trim (LF), Paint/Primer (gal), and Caulk Tubes.
Use the paint/primer quantity alongside your finish schedule — fiber cement requires field painting at all cut edges.

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