Siding Calculator
Multiply total wall length by average height, subtract the door and window area you enter, add waste, and convert the net area into siding squares of 100 sq ft plus a panel count at 8 sq ft of exposed coverage per panel.
Siding Calculator
Multiply total wall length by average height, subtract the door and window area you enter, add waste, and convert the net area into siding squares of 100 sq ft plus a panel count at 8 sq ft of exposed coverage per panel.
Method and assumptions
Figur turns your measurements into purchase quantities with standard geometry: it computes the area, length, or volume, applies the waste or spacing you enter, and rounds up to whole purchase units. Everything is calculated locally in your browser.
- Purchase quantities round up to whole units (sheets, bundles, boards, bars, or packages) because suppliers do not sell fractions.
- Assumed coverages and package sizes (for example, 3 bundles per square or 4×8 sheets) are common conventions; verify your product label and supplier.
- The waste percentage is applied exactly as entered; complex cuts, patterns, and damage can require more.
- The result does not replace your field measurements, plans, or local code requirements.
This tool provides a planning takeoff, not a binding bid, structural design, or engineering advice. Confirm quantities with field measurements, your supplier, and the applicable professionals before buying.
Sources and references
No external data source is required: this calculator applies standard geometry to the measurements, coverages, and waste you enter.
Frequently asked questions
Why subtract window and door area?
Siding is bid on net wall area. Subtracting openings keeps the order honest, while the waste percentage you add covers cuts, laps, and damaged panels around those openings.
What panel coverage does this assume?
It assumes a common 12-ft vinyl panel with 8 inches of exposure — about 8 square feet of coverage. Check your product's actual exposure and adjust the panel count if it differs.