Spray Foam Insulation Cost Calculator
Board feet, sets and installed cost for open or closed cell.
Enter your values
Results update instantly as you type — no submit needed.
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 $1.00–1.50 per board foot installed.
board feet = area × thickness (in)
At a glance
| What it does | Board feet, sets and installed cost for open or closed cell. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Area to insulate, Foam type, Target R-value, Price per board foot |
| Main output | Installed cost |
| Formula | board feet = area × thickness (in) |
| Cost | Free — no sign-up, no download |
How to use the Spray Foam Insulation Cost Calculator
- 1Enter the square footage of wall, roof deck or crawl space.
- 2Choose open or closed cell foam.
- 3Set your target R-value and local price per board foot.
Inputs explained
- Area to insulate(sq ft)
- Enter the area to insulate you are working with.
- Foam type
- Choose one of: Open cell (R-3.7/in), Closed cell (R-6.5/in).
- Target R-value(R)
- Enter the target r-value you are working with.
- Price per board foot($)
- Enter the price per board foot you are working with.
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.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.