Window Heat Loss Calculator
Window Width (m)
Window Height (m)
U-value (W/m²·K)
Temperature Diff ΔT (°C)
U-value: Single glazing ≈ 5.7 · Double ≈ 2.8 · Triple ≈ 0.8
✓Heat Loss
Area (m²)
1.80
Heat Loss (W)
100.8
Annual Cost (est.)
$65.32
Annual Heating Energy (kWh)
435.5 kWh
A window heat loss calculator estimates the thermal energy lost through windows based on their U-value (thermal transmittance), area, and the temperature difference between inside and outside.
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