🌡 Insulation Calculator PRO
Batt count, rolls needed, coverage & cost — walls, attics & ceilings.
Wall Section — updates as you type
Stud bays filled with batts. Bags follow coverage area plus the waste factor.
1 Area to Insulate
2 Insulation Type & R-Value
3 Pricing & Project
Client Details
Results
Coverage
Materials Needed
Insulation Selection Guide
Show formulas, R-values & pro tips ▼
Formula
Area to Cover= Base Area × (1 + Waste%)
Rolls Needed= Area to Cover ÷ Coverage Per Roll
Batts= Area to Cover ÷ (Batt Width × Stud Length)
Coverage Rates by Type
- Fiberglass Batt: 88.6 sqft/roll (16" OC), 59.1 sqft/roll (24" OC)
- Rock Wool: 59.2 sqft/roll — denser, better fire resistance
- Foam Board: 32 sqft/sheet (4×8) — rigid, moisture resistant
- Spray Foam: ~200 sqft/can (1" thick) — excellent air seal
- Cellulose: ~25 sqft/bag (blown) — eco-friendly, fills gaps
R-Value Reference
- R-11: 2×4 interior walls — minimal insulation requirement
- R-13: 2×4 exterior walls — standard wall insulation
- R-19: 2×6 walls and floor joists — upgraded wall insulation
- R-30: Attic floor — standard attic insulation (code in most areas)
- R-38: Attic floor — cold climate upgrade
- R-49: Attic floor — extreme cold climates, premium efficiency
Common Mistakes
- Compressing batts into spaces too small — reduces R-value significantly
- Leaving gaps — even small gaps let air bypass insulation
- Ignoring moisture — fiberglass in direct contact with condensation surfaces molds
- Wrong R-value for climate zone — check local building code requirements
Drag to rotate — Scroll to zoom
Related Calculators
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
Our yalıtım calculator provides accurate material estimates. Enter dimensions and receive exact quantities and costs for your project.
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Yalıtım formulas and calculations.
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💡 Yalıtım Pro Tips
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✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.