Calculate recommended R-value and insulation thickness needed for attics, walls, and floors based on climate zone.
for your zone and location
| Area | 600 ft² |
| Target R-Value | R-49 |
| Current R-Value | R-0 |
| Additional R Needed | R-49 |
| Thickness Required | 15.6" |
Check local building codes — they may require higher R-values than the federal minimum.
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Additional R = Target R − Current R
Thickness = Additional R ÷ R-per-inch
Coverage varies by product and thickness
Zone 1–2: R-30. Zone 3: R-38. Zone 4–8: R-49 to R-60. Check ENERGY STAR recommendations for your zone.
R-value measures thermal resistance. Higher R-value = better insulation. Double the R-value = half the heat loss.
Fiberglass batts: ~9.5". Blown cellulose: ~8". Spray foam: ~5" (closed-cell).
Blown-in cellulose or fiberglass is easiest for existing attics. Batts work for open joist bays.
Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.