Insulation R-Value Calculator
Free insulation tool

Insulation R-Value Calculator

Pick a material and enter the depth to see the approximate R-value, or enter a target to see the depth you need.

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

    Pick the material

    Fiberglass, cellulose, foam, mineral wool or board.

  2. 02

    Enter the depth

    Thickness in inches.

  3. 03

    Read the R-value

    The approximate total for that layer.

  4. 04

    Try a target

    Enter an R-value to see the depth you need.

Tips

  • R-value per inch is a typical figure and varies by product and density.
  • Compressed insulation delivers less than its label, so depth should be measured in several places.
  • Check current local code for the target that applies to your home.
Questions

About this tool.

What is R-value?

R-value measures resistance to heat flow. A higher number means the layer slows heat more.

Are these exact?

No. They are typical planning figures. The product label and installation quality decide the real result.

Is a higher R-value always better?

Not always. Returns diminish, so air sealing and ducts also matter.

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