Spray Foam Insulation Cost Calculator
Board feet, sets and installed cost for open or closed cell.
Enter your values
ⓘ Live results
Results
- Installed cost
- $8,769.23
- Board feet
- 7,015
- Thickness needed
- 5.85 in
- Cost per sq ft
- $7.31
- DIY kits (600 bf)
- 12
Quick answer
Spray foam is priced per board foot (1 sq ft at 1 in thick); open cell runs about $0.45–0.75 and closed cell $1.00–1.50 per board foot installed.
board feet = area × thickness (in)
How to use the Spray Foam Insulation Cost Calculator
- 1Enter the square footage of wall, roof deck or crawl space.
- 2Choose open or closed cell foam.
- 3Set your target R-value and local price per board foot.
Worked example
Using the values the calculator loads with:
Inputs
- Area to insulate1200 sq ft
- Foam typeClosed cell (R-6.5/in)
- Target R-value38 R
- Price per board foot1.25 $
Results
- Installed cost$8,769.23
- Board feet7,015
- Thickness needed5.85 in
- Cost per sq ft$7.31
- DIY kits (600 bf)12
Frequently asked questions
What is a board foot of spray foam?
One square foot sprayed one inch thick — the standard unit foam contractors quote on.
Is closed cell worth the extra cost?
In crawl spaces, rim joists and roof decks yes: it adds a vapour barrier and nearly double the R per inch.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.