Insulation Calculator

Estimate insulation bags for an area.

Area to insulate

Coverage per bag

Waste (%)

Bags / rolls needed (bags) 27

Formula: bags = area × (1 + waste) ÷ coverage per bag

Step-by-step with your numbers:

1. Values used:

2. Area to insulate = 1,000

3. Coverage per bag = 40

4. Waste = 5 %

6. Bags / rolls needed = 27bags

Did we solve your problem today?

Estimate how many bags or rolls of insulation you need.

The math behind it

bags = area × (1 + waste) ÷ coverage per bag (coverage depends on the R-value and product).

1,000 ft² at 40 ft²/bag → 27 bags.

Coverage source?

The product label lists ft² per bag at a given R-value.