Insulation R-Value ⇄ U-Value Converter - 100% Free Online Tools

🌡️ Insulation R-Value ⇄ U-Value Converter 🏠

Convert between R-Value and U-Value for building energy efficiency.

Input Your Insulation

Value:

Input Unit:

Material & Thickness (Optional)

Select Material (to pre-fill R-Value per inch/cm):

Thickness (cm): *If using material, this multiplies its R-value/cm. (1 inch = 2.54 cm)

Regional Building Standards

Select your region to check if your insulation meets typical recommendations.

US UK Europe (General)

Component Type (for standard check):

Conversion Results

R-Value (US / Imperial):

0.00

U-Value (SI / Metric):

0.00

Calculate to see if your insulation meets standards.

* **R-Value vs U-Value:** R-Value (Thermal Resistance) indicates how well a material resists heat flow (higher is better). U-Value (Thermal Transmittance) indicates how much heat flows through a material (lower is better).
* **Units:** US R-Value is typically in $ft^2 \cdot ^\circ F \cdot h / BTU$. U-Value is typically in $W / (m^2 \cdot ^\circ C)$.
* **Material R-values:** Values provided in the dropdown are approximate R-values *per inch* or *per cm* of thickness. Actual values can vary by manufacturer and specific product.
* **Standard Checker:** The "meets standard" checker uses general, illustrative target values for typical residential construction. Actual building codes and energy efficiency requirements vary significantly by specific location, climate zone, and building type. Always consult local building regulations and qualified professionals.
* **Disclaimer:** This tool is for informational and estimation purposes only. Do not use for certified building compliance or critical engineering calculations.