How to use this insulation calculator
Estimate insulation bags or bundles, coverage, waste, material cost, labor, and project totals.
Formula
Order area = measured area × (1 + waste %). Packages = order area ÷ labeled coverage at the target R-value, rounded up.Worked example
Example: For 1,000 sq ft with 8% waste and 40 sq ft per package, order area is 1,080 sq ft and the estimate is 27 packages.
Accuracy and limitations
Coverage can change by R-value, cavity size, installed thickness, settling, and framing. Always use the exact product chart and local code requirements.