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Window Heat Loss / Heat Transfer
Uw Value Calculator

Window heat loss diagram

Thermal bridging detail

Glazing Area (m²): { Ag }
Frame Area (m²): { Af }
Total Window Area (m²): { Acw }
Heat Transmittance
for IGU (W/m²K): { Ug }
Heat Transmittance
for Frames (W/m²K): { Uf }
Result: (W/m²K) {Ucw}

Disclaimer; This calculator can not be used for constructions and official use, this is a simple and informative calculator, please apply FMT for detailed and official calculations.

Thermal camera image

Window cross-section