Insulation Calculator
Estimate insulation thickness, coverage and pack count from area, target R-value and material performance.
Why use this insulation calculator?
Insulation Calculator relates target R-value to an editable R-value per inch and estimates packs from project area.
Example
Enter 1,000 ft², R-30 and a material rated around R-3.5 per inch to estimate thickness and packages.
Important note
Installed R-value depends on product, compression, framing, gaps, moisture and local energy-code requirements.
How to use it
Start with the inputs shown above, review any options or assumptions, then generate the result. Where the tool creates a file, keep the original until you have opened and checked the downloaded output.
Frequently asked questions
Is this tool free?
Yes. The core tool is free to use.
Do I need an account?
No. You can use it without signing up.
Does it work on mobile?
Yes. Toolbox is designed for modern mobile and desktop browsers.