Walls, windows & doors, and roof — net insulation square footage for homes and commercial buildings.
Enter each wall's length × height, or a single row with the full building perimeter as the length.
| Label | Length (ft) | Height (ft) |
|---|
Each opening's area is subtracted from the gross wall area above.
| Label | Width (ft) | Height (ft) | Qty |
|---|
Flat/low-slope commercial roofs: leave pitch at 0/12 (surface area = footprint).
Calculator only — no data is stored or sent anywhere. Figures are estimates; always confirm against an actual site measurement before ordering material. Want a specialist to double-check your plans? Request a plan review.