About Insulation Calculator
Calculate fiberglass or mineral wool batt rolls needed for attic and wall cavities.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
Rolls = Area (sq ft) / Roll Coverage (Standard 15" batt roll covers ~40 sq ft)
Example Calculation
Insulating an 800 sq ft attic space requires 20 standard insulation rolls.
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.