Spray Foam Insulation Cost Calculator
Estimate installed spray foam insulation cost from the area and your material and labor rates per square foot. Splits material, labor, and total.
How this calculator works
Installed spray-foam cost is material plus labor per square foot of the surface being sprayed. The calculator applies your rates to the area and splits the totals.
Formula: Total = area × material rate + area × labor rate.
Worked example
A 25 ft × 20 ft area (500 sq ft), $1.50/sq ft material, $1/sq ft labor:
- Area: 25 × 20 = 500 sq ft
- Material: 500 × $1.50 = $750
- Labor: 500 × $1 = $500
- Total installed: $1,250
Cost reference (at $2.50/sq ft installed)
| Area | Installed cost |
|---|---|
| 500 sq ft | ~$1,250 |
| 1,000 sq ft | ~$2,500 |
| 2,000 sq ft | ~$5,000 |
How to use
Measure the wall, attic, or crawl-space area and enter your quoted rates. Closed-cell and thicker/high-R applications cost more, so match the rate to the system you’re getting. For batt or blown alternatives, see the Insulation and Blown-In Insulation calculators.
Frequently asked questions
How much does spray foam insulation cost?
Spray foam typically runs $1.50–4 per square foot of area at a standard thickness, with closed-cell costing more than open-cell. The calculator defaults to $1.50 material and $1 labor per square foot; thicker applications and higher R-values cost more.
Open-cell or closed-cell?
Open-cell is cheaper and good for interior walls and sound; closed-cell costs more but has a higher R-value per inch, adds structural rigidity, and blocks moisture — the choice for rim joists, basements, and exterior applications.
Is spray foam priced by the square foot or board foot?
Contractors quote both. Board foot (one square foot at one inch thick) is precise for varying thickness, but square-foot pricing at a standard depth is common for quotes. This calculator uses square-foot pricing; ask your installer which they use.
Why is spray foam more expensive than batts?
It requires specialized equipment and trained applicators, and the material itself costs more. But it air-seals as it insulates, which fiberglass batts don't, often lowering energy bills enough to offset the premium.
Estimates only. Verify quantities with your supplier before purchasing.