CalculatorAndroidWeb

Smart Insulation Calculator

R-value, batts, blown-in bags, spray foam & real cost data — free on Android and the web.

On iPhone? Smart Insulation Calculator is Android-only. The Roofing Calculator & Estimator app on the App Store includes deck, fence, drywall, insulation, tile, sod and gravel calculators from version 1.7 — live on iPhone and Android now.

About Smart Insulation Calculator

Smart Insulation Calculator is a full set of free insulation calculators for attics, walls, crawlspaces, basements, rim joists, ducts and pipes. Estimate R-value, how many batts or blown-in bags you need, spray foam board feet, heat loss, and 2026 material + labor cost — with DOE climate-zone R-value targets built in. Use it in any browser at smartinsulationcalculator.com, or download the free Android app on Google Play.

Features

✓R-value and U-value calculators with DOE climate-zone targets
✓Batts, blown-in bags, rigid foam boards and spray foam board feet
✓Attic, wall, crawlspace, basement, rim joist, duct and pipe calculators
✓2026 material, labor and installed cost data — DIY vs contractor
✓Heat loss and energy savings estimates
✓Free Android app on Google Play, plus the web version

Who it's for

Homeowners insulating a house, DIYers pricing an attic job, and insulation contractors sanity-checking a bid.

Want the math behind it? How much insulation do I need starts from the IECC R-value for your climate zone.

Frequently asked questions

Is it free?▾

Yes — every calculator is free on the web and in the Android app, with no signup.

Is there an app?▾

Yes — Smart Insulation Calculator is a free Android app on Google Play, and every calculator also works in your browser. It is Android-only; on iPhone, see Roofing Calculator & Estimator on the App Store.

How does it know the right R-value?▾

DOE recommended R-values by climate zone are built in, so results are matched to where you live.

Does it include cost?▾

Yes — 2026 material and labor pricing, with DIY and contractor totals side by side.

Which insulation types are supported?▾

Fiberglass batts, blown-in cellulose and fiberglass, rigid foam board, spray foam, and radiant barrier.