Insulation Cost Calculator
Use the insulation cost calculator below to get an instant material and installed price range for your project. To estimate insulation, multiply the length × width of the surface for the square footage, then multiply by the installed cost per square foot for your insulation type. Fiberglass batts run about $1–$2.40/ft², blown-in $1–$2.50, and spray foam $3–$7. A 600 ft² area in batts costs roughly $600–$1,440.
Your measurements
Enter your measurements
Fill in the fields to see your estimate.
Insulation cost by type
Installed cost per square foot, including materials and labor.
| Type | Cost per ft² (installed) | R-value per inch | Best for |
|---|---|---|---|
| Fiberglass batt | $1.00 – $2.40 | R-3.1 | Walls, budget jobs |
| Blown-in cellulose | $1.00 – $2.50 | R-3.5 | Attics, retrofits |
| Closed-cell spray foam | $3.00 – $7.00 | R-6.5 | Air-sealing, rim joists |
What affects insulation cost
- Project size — larger insulation jobs lower the cost per unit but raise the total.
- Material grade — premium products cost more but often last longer.
- Labor rates — local wages and demand swing installed prices significantly.
- Region — prices vary by state and metro (see local cost pages below).
- Site access & prep — removal of old material and difficult access add cost.
- Season — booking in the off-season can cut labor pricing.