Insulation for 1000 sq ft
5 percent waste. Check package coverage.
Area with waste
1050sq ft
Packages (40 sq ft)
27
packages = 1000 × 1.05 ÷ coverage per package
About 92.9 m². Use your product coverage.
Open the Insulation CalculatorAbout this estimate
Insulation is sold by area coverage, which depends on the product. Read the coverage on the bag or roll, then divide your area by it. This page assumes 40 square feet per package as an example.
Cutting batts? A sharp utility knife with spare blades cuts fibreglass and mineral wool cleanly.
View on AmazonAs an Amazon Associate we earn from qualifying purchases.
Common questions
How much insulation for 1000 square feet?
With 5 percent waste, about 1050 square feet. At 40 square feet per package, that is 27 packages.
Does R value change how much I buy?
Not the package count for a given area. R value sets the thickness and price, while coverage per package sets how many you buy.
More Calculators
Concrete New
Enter slab dimensions. Result rounds up with a 7 percent waste allowance.
Gravel New
Enter the area dimensions and depth. Result rounds up with a 5 percent waste allowance.
Mulch New
Enter the bed area and depth. Result rounds up with a 5 percent allowance.
Topsoil New
Enter the area and depth. Result rounds up with a 5 percent allowance.
Paint New
Enter total wall area and coats. Result rounds up to whole units.
Flooring New
Enter room area and the coverage printed on the box. 10 percent waste added.
Tile New
Enter the area and one tile size. 10 percent waste added.
Drywall New
Enter total area to cover. 10 percent waste added.
Paver New
Enter the patio size and one paver size. 5 percent waste added.
Sand New
Enter the area and depth. 5 percent allowance added.
Roofing New
Enter the roof surface area. 10 percent waste added. Three bundles per square.
Insulation New
Enter area to cover and the coverage printed on the package. 5 percent added.
Fence New
Enter total fence length and post spacing.
Sod New
Enter the area to cover. 5 percent allowance added.
Grass Seed New
Enter area and seeding rate. Default rates suit a new lawn.
Fertilizer New
Enter area, target nitrogen rate and the first number on the bag.
Cubic Yards New
Enter length, width and depth. No waste added.
Square Footage New
Enter length and width.
Board Foot New
Enter board dimensions and quantity.
Material Cost New
Enter quantity, unit price, tax and delivery. Figures are in your own currency.