U-Wert Thermal transmittance · EN ISO 6946
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Calculate the U-value

The U-value (thermal transmittance, W/(m²·K)) describes the heat flow through a building element. Calculated per EN ISO 6946.
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U-value calculator

Rsi/Rse preset for horizontal heat flow (EN ISO 6946). Empty layers are ignored. Simplified estimate without thermal bridges.

U-value: —

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What is the U-value?

The U-value (thermal transmittance) describes the heat flow through a building element in W/(m²·K). Calculated per EN ISO 6946.