Insulation & comfort
R-Value Converter
Your measurements : thermal resistance r (si). Your estimate : thermal resistance r, r-value (us), thermal transmittance u.
How the calculation works
R-Value Converter
R (US) = R (SI) × 5.678263; U = 1 / R (SI)Before you order
- This is a rough planning estimate. Choose the W/m³ assumption for your situation; climate, insulation, air leakage and glazing can change the load. A professional heat-loss or cooling-load calculation is needed for final equipment selection.
- Use the coverage, yield and dimensions printed on your product. Waste allowance is adjustable; real cuts and site conditions may change the order.
Worked example
- Thermal resistance R (SI)
- 3 m2K/W
Thermal resistance R 3 m2K/W
R-value (US) 17.03 h·ft²·°F/BTU