Insulation Calculator
Calculate the amount of insulation needed based on R-value requirements. Compare different insulation types and estimate costs.
Project Details
Area to Insulate:
Desired R-Value:
13
560
Insulation Type:
$
Fiberglass Batts Needed
26
rolls/bundles for R-13
📐Total Area
1120 sq ft
🎯Net Area
1030 sq ft
📏Thickness Required
4.1"
🌡️R-Value/Inch
3.2
Cost Estimate:
Fiberglass Batts26 rolls/bundles
Cost per Square Foot$0.50
Estimated Material Cost$515.20
Potential Energy Savings
Up to 10%
Estimated annual heating/cooling cost reduction with R-13 insulation
Note: ~8% (90 sq ft) deducted for wall studs and framing
R-Value Recommendations by Climate
| Zone | Attic | Walls | Floor |
|---|---|---|---|
| Hot (Zone 1-2) | R-30 to R-49 | R-13 to R-15 | R-13 |
| Mixed (Zone 3-4) | R-38 to R-60 | R-13 to R-21 | R-19 to R-25 |
| Cold (Zone 5-7) | R-49 to R-60 | R-20 to R-28 | R-25 to R-30 |
Insulation Tips
- • Higher R-value = better insulation. But diminishing returns above R-50
- • Closed-cell spray foam also acts as a vapor barrier
- • Fiberglass batts are easiest for DIY installation
- • Blown insulation is best for irregularly shaped spaces
- • Always wear protective gear when handling insulation