Insulation Calculator
Calculate batts, rolls, or blown-in insulation needed for walls, attics, and crawl spaces.
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How to Calculate Insulation
Measure total area to insulate. For batts, divide area by coverage per roll/pack. For blown-in, calculate volume (area x depth) and convert to bags based on desired R-value.
Frequently Asked Questions
What R-value do I need?
Depends on your climate. Mild climates: R-2.5 to R-4.0 (walls), R-4.0 to R-6.0 (ceilings). Cold climates: R-4.0 to R-6.0 (walls), R-6.0 to R-8.0 (ceilings). In US zones: R-13 to R-21 walls, R-30 to R-60 attics. Check your local energy code.
How many rolls of insulation do I need?
Measure total area between studs or joists. Rolls typically cover 3.7-8.2 m² (40-88 sq ft) depending on width and length. Check product packaging and buy 5-10% extra for cuts.