Construction

Insulation Calculator

Estimate insulation bags for an area.

Area to insulate

Coverage per bag

Waste (%)

Calculated Output

Bags / rolls needed (bags) 27

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

Step-by-Step Breakdown

1. Values used:

2. Area to insulate = 1,000

3. Coverage per bag = 40

4. Waste = 5 %

6. Bags / rolls needed = 27bags

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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.