Insulation & Sealing
Estimate material quantity for repeated gaps or cavities only after the compatible foam product and usable yield are known. Enter a measured total gap length plus average width and depth; the calculator converts that geometry to board feet and whole product units without choosing foam chemistry, expansion class or permitted use.
Change the defaults to match your project and the product you plan to buy.
Project result
Review measured gap volume, board-foot target and whole product units from the entered usable yield.
At a glance
Planning estimate only. Verify product coverage, package size, supplier specifications and project requirements before purchasing.
Budget scenario
Use a current supplier subtotal or reuse a priced calculator result, then add optional delivery, tax and contingency. Home Measure Lab does not fetch or guess live prices.
Enter a current supplier subtotal or reuse a priced calculator result.
Budget values are local planning inputs, not live quotes. Verify tax treatment, delivery, labor and supplier pricing before purchasing.
Methodology
length × average width × average depth
Models the compatible gap geometry.
gap cubic inches ÷ 144
Uses the standard board-foot volume definition.
board feet × (1 + allowance)
Keeps overspray and practical loss visible.
target ÷ entered usable yield, rounded up
Uses the selected product's usable yield.
Group only gaps that can reasonably share one average width, depth and product. Measure the developed length of the compatible joints, then record representative width and fill depth from the actual condition. Wide or deep cavities can behave very differently from narrow air-sealing joints, so split them into separate calculations instead of averaging dissimilar conditions into one number.
Published theoretical foam yield can differ from field yield because temperature, substrate, bead shape, expansion and application technique matter. Use a conservative usable yield from the selected product and project conditions. The result is material planning only: verify compatible gap range, fireblocking/firestop requirements, exposure limits and whether trimming or multiple passes are permitted.
Reference
| Layer | Quantity | External decision |
|---|---|---|
| Gap geometry | length × width × depth | Compatible product and gap range. |
| Volume | board feet | Expansion/application behavior. |
| Allowance | visible reserve | Field loss and technique. |
| Purchase | whole cans / kits | Actual usable product yield. |
Questions
No. It is a planning volume reference; real usable yield depends on product and conditions.
No. Firestop and fireblocking systems require product- and assembly-specific selection outside this calculator.
Only group similar gaps. Calculate materially different widths or depths separately.
Planning guides
Insulation & Sealing
Convert measured gap length, average width and fill depth into cubic volume and board feet before applying product-specific usable yield.
Read guide →Insulation & Sealing
Compare calculated gap volume with conservative usable spray-foam yield instead of treating theoretical package yield as guaranteed field output.
Read guide →Estimate sealant tubes from measured joint length, entered coverage per tube and a handling or touch-up allowance.
Open calculator → Insulation & SealingEstimate weatherstripping rolls from measured door and window perimeter, installation allowance and the entered stock-roll length.
Open calculator → Insulation & SealingEstimate rigid insulation board area and whole sheets for a rim-joist band from measured run, rim height, openings, sheet size and a visible cut allowance.
Open calculator →