Insulation Calculator
Estimate batt or roll insulation by the area you are covering. Coverage per bag depends on R-value; this assumes ~88 sq ft, common for R-13 wall batts.
Insulation calculator
ft
ft
How to estimate insulation
- Coverage per bag changes with R-value and width - a thicker, higher-R batt covers less. Check the package.
- Measure the actual area between framing you need to fill, not the gross wall or attic size.
- For attics, blown-in insulation is priced by bag-per-target-R-value instead; this estimator is for batts and rolls.
Frequently asked questions
How much area does a bag of insulation cover?
It depends on R-value. R-13 wall batts often cover ~88 sq ft per bag; higher R-values cover less, so always check the label.