Building tool
Insulation Calculator
Estimate insulation area, batts, rolls, bags, and cost with a waste allowance.
Runs in your browserResult
- Net area
- 285 sq ft
- Area with waste
- 313.5 sq ft
- Packs needed
- 3
- Estimated material cost
- $225.00
Match cavity depth, framing spacing, R-value, vapor control, fire rules, and product coverage to the exact assembly.
How to use this insulation calculator
- Measure the project, enter the dimensions in the units shown, and add the waste, spacing, coverage, or material settings that apply.
- Review the calculated totals, units, and assumptions. Check the inputs and units before relying on the result.
- Change one input at a time to compare another case, then copy or save the result you plan to use.
About this insulation calculator
The Insulation Calculator lets you estimate insulation area, batts, rolls, bags, and cost with a waste allowance. The controls cover only the inputs needed for the result.
You can also use it to compare results after changing one input.
Example
Enter the wall or attic area, subtract openings, choose package coverage, and add waste to estimate batts, rolls, or bags.
Common uses
- → estimate insulation area, batts, rolls, bags, and cost with a waste allowance
- → compare results after changing one input
- → save an estimate for planning or comparison