What R-value do I need?

Attics often need R-38 to R-60; walls typically R-13 to R-21 depending on climate.

How much insulation waste should I add?

Add 5–10% for trimming around studs, wiring, and outlets.

Enter the area to insulate and the coverage per bag or roll to estimate how many packages you need.

Estimates only. Round up and buy a little extra to account for waste, spills, and breakage.

Packages = (area × (1 + waste%)) ÷ coverage per package.

What R-value do I need?: Attics often need R-38 to R-60; walls typically R-13 to R-21 depending on climate.
How much insulation waste should I add?: Add 5–10% for trimming around studs, wiring, and outlets.

Estimate drywall sheets for walls and ceilings.

Calculate the area of a room or surface in square feet, yards, and meters.

Estimate siding squares for your home's exterior walls.

Estimate boxes of flooring with a waste factor for any room.