Insulation Calculator
Calculate insulation needs for attics, walls, crawlspaces, and floors. Compare 8 insulation types by R-value, cost, and coverage. Includes climate zone recommendations, DIY vs professional costs, and energy savings payback estimates.
Unlock 8 AI-powered analysis tools
Resume scanner, contract analyzer & more — Pro $9/mo
Want more? Unlock the full experience
Compare Pro allowances for your work with Insulation Calculator
More daily tool uses
500 tool uses per day on Pro
Monthly AI allowance
50 AI uses per month across supported AI tools
Ad-free tools
Use NexTool without ads while your Pro plan is active
Fiberglass, foam, and spray insulation for energy savings.
Switch providers and save on your energy bill.
Sponsored · We may earn a commission at no cost to you
How to Use Insulation Calculator
- 1Select area type and dimensions
- 2Choose insulation type
- 3Set target R-value for your climate zone
- 4View materials needed and cost estimate
Frequently Asked Questions
It depends on your climate zone and area being insulated. Most attics need R-38 to R-60, walls need R-13 to R-21, and floors need R-25 to R-30. The DOE provides recommended R-values for 8 US climate zones.
Fiberglass batts are cheapest and DIY-friendly. Blown-in cellulose fills gaps well for attics. Spray foam provides the best air sealing. Choose based on your budget, application area, and whether you're DIY or hiring a professional.
Fiberglass batts: $0.50-1.00/sqft at R-13. Blown-in cellulose: $0.80-1.50/sqft at R-38. Spray foam: $1.50-4.00/sqft. Professional installation adds 50-100% to material costs. Attic insulation typically pays back in 3-7 years through energy savings.
The Insulation Calculator is an online tool that lets you calculate insulation needs by r-value with material comparison and energy savings estimates. It is part of NexTool's collection of free tools designed to help you work faster and more efficiently.
The Free plan includes 10 tool uses per day. Some features require an account or a paid plan. Check the controls on the tool page and Pricing for the applicable limits.
The Insulation Calculator returns results based on the inputs and the tool methodology. Check assumptions, units and source dates. Treat projections as estimates. For critical decisions, always consult a qualified professional.
Yes, the Insulation Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.
No spam. Unsubscribe anytime.
About Insulation Calculator
Calculate insulation needs for attics, walls, crawlspaces, and floors. Compare 8 insulation types by R-value, cost, and coverage. Includes climate zone recommendations, DIY vs professional costs, and energy savings payback estimates.
Use the controls shown by Insulation Calculator to generate and review your result. Available features and usage limits depend on your plan. Check the tool's instructions and privacy information before submitting data.
Embed This Tool
Add Insulation Calculator to your website. Paste the code below into your HTML. The iframe auto-resizes to fit the tool content.
Related Tools
Get Free Financial Guides
Guides and updates about NexTool calculators.