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Window Uw Calculator (EN ISO 10077-1)

Choose the window size, visible frame width, profile series, glass type and spacer, and calculate the whole-window thermal transmittance (Uw) using the simplified method of EN ISO 10077-1.

500 mm3000 mm
500 mm3000 mm
Window Uw value (W/m²K)1.68
Glazed area ratio70%
Window area (m²)1.82
Heat loss at a 20 °C difference (W)61
Technical documents

This calculation is for information only. It uses the simplified method of EN ISO 10077-1 and assumes an equal frame width on all four sides. Windows with mullions or transoms, detailed frame geometry and project declarations require a numerical calculation to EN ISO 10077-2.

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