U-value
U-value calculator
Calculate the U-value of your building element.
Calculate the U-value approximately from your element's layer build-up. Enter the thickness and thermal conductivity λ for each layer – the U-value is calculated instantly.
| Material (optional) | Thickness (cm) | λ (W/(m·K)) | R (m²·K/W) | Remove layer |
|---|
Clicking the material field shows common building materials with a preset λ. You can override the values.
Thermal resistance Rᴛ – m²·K/W
U-value – W/(m²·K)
incl. surface resistances Rsi/Rse
Simplified, steady-state (1D) calculation without thermal bridges or moisture. The thermo-reflective effect of PSCoat is not captured by a purely λ-based calculation – project-specific values are available via NANO.DOCS or from our contact.