Insulation Calculator
Estimate insulation materials and R-value for your project
Length of area to insulate
Width of area to insulate
Select material
Check local code
Total Area
—
sq ft
Insulation Thickness
—
inches
Batts/Rolls Needed
—
pieces
Estimated Cost
—
USD
How to Use This Calculator
Proper insulation reduces energy bills by 10-50%. Our calculator helps determine R-value and material quantities.
- Determine climate zone and target R-value
- Measure length and width
- Choose insulation type
- Enter specifications
- Consider air sealing first
AI Insights
Smart analysis for your project
Smart Estimates
Our AI cross-references material costs, regional pricing, and project complexity for more accurate estimates.
Waste Optimization
AI-calculated waste factors based on project type, not flat percentages. Saves 5-15% on material costs.
Best Practices
Recommendations derived from building codes, contractor data, and thousands of completed projects.
Calculation Formula
Thickness = Target R / R per inch
Batts = Area / Batt coverage (40 sq ft/batt)
Frequently Asked Questions
What R-value do I need for my attic?
R-38 to R-49 for most US climate zones (Zones 4-8). Southern zones (1-3): R-30 to R-38.
How much does attic insulation cost?
DIY fiberglass batts: $0.30-$1.50/sq ft. Professional blown-in: $1.00-$2.50/sq ft.
Can I add new insulation over old?
Yes. Use unfaced batts or blown-in over existing. Do not compress old insulation.