Insulation Calculator — Bags and Coverage

Coverage Inputs

Area to Insulate

sq ft

Target R-Value

R-Value per Bag Layer

Coverage per Bag (at bag layer R)

sq ft/bag

Insulation Bags Needed

—

bags (rounded up)

Layer Multiplier

—

Effective Area

—

sq ft

How This Insulation Estimate Works

Bags = (Area × (TargetR ÷ BagR)) ÷ CoveragePerBag

Coverage on bag labels changes with installed depth. This calculator uses the numbers you enter from your product label, so always verify manufacturer tables for your exact SKU.

Installation Tips

Air-seal before insulating for better performance.
Do not block soffit vents in attics.
Buy 5–10% extra for irregular framing and missed spots.