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 the assumptions or options, 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 Insulation Calculator free?
Yes. The core tool is free to use without creating an account.
Do I need an account to use Insulation Calculator?
No. You can use the core Toolbox workflow without signing up.
Does Insulation Calculator work on mobile?
Yes. Toolbox is designed for modern mobile and desktop browsers, although complex file workflows can be easier on a larger screen.