Batt and Roll Insulation Calculator
Free insulation tool

Batt and Roll Insulation Calculator

Enter the wall or floor area and the stud spacing to see how many batts or rolls to plan for, with an allowance for waste.

These tools give planning-level estimates from typical values. They are not quotes, designs or engineering, and results depend on your actual materials, depths, access, local rules and conditions. Only a site visit can confirm what a project needs, and we give you a written scope and price before any work begins.

How it works

Four quick steps.

  1. 01

    Enter the area

    Wall or floor area in square feet.

  2. 02

    Pick the cavity width

    Fifteen or twenty-three inch batts are common.

  3. 03

    Add a waste allowance

    Cuts and odd cavities need extra.

  4. 04

    Read the count

    Batts or rolls to plan for.

Tips

  • Framing spacing decides the batt width, with sixteen inches on center being common.
  • Buy the thickness that fills the cavity without compressing.
  • Order a little extra for cuts around windows and boxes.
Questions

About this tool.

Is this exact?

No. It is a planning estimate. We measure each cavity and take off exact material.

Why add waste?

Cuts around openings, wiring and boxes use extra material.

Do I need faced or unfaced batts?

It depends on the location. We choose the facing for each assembly.

Free estimate

Ready to start your insulation project?

Call us and we will inspect the attic, walls and crawl space and give you a clear plan and a written scope.

Call NowFree Estimate