Spray Foam Calculator

Enter your area and desired thickness to compare open-cell and closed-cell spray foam insulation by board feet, R-value achieved, and total cost.

Desired Thickness

Area to Insulate (sq ft)

Waste Factor (%)

Pricing (edit to match local rates)

Open-Cell / Board Ft ($)

Closed-Cell / Board Ft ($)

Adjusted Area

1100 sq ft

1000 sq ft + 10% waste

Board Feet

2,200

1100 sq ft x 2" thick

R-Value (Open-Cell)

R-7.4

3.7 per inch x 2"

R-Value (Closed-Cell)

R-13.0

6.5 per inch x 2"

Cheapest Option

Open-Cell Spray Foam

$1,210.00

Purchase Option	Quantity	Est. Cost
Open-Cell Spray Foam (R-7.4)Best value	2,200 board ft	$1,210.00
Closed-Cell Spray Foam (R-13.0)	2,200 board ft	$2,750.00

Cheapest option: Open-Cell Spray Foam at $1,210.00Open-cell spray foam is more affordable and provides good soundproofing. It is best suited for interior walls and attics where moisture barriers are not critical. It expands significantly, making it great for filling irregular cavities.

Consider Closed-Cell for Higher PerformanceAt 2" thick, closed-cell delivers R-13.0 vs open-cell's R-7.4. If you need a vapor barrier or maximum R-value in limited space, closed-cell may be worth the extra $1,540.00.

This is a cost estimate only. Spray foam insulation should be installed by licensed professionals. Actual costs vary by region, accessibility, and project complexity. Board foot calculations assume uniform thickness across the entire area.