// multi-utility computation suite · offline · instant · precise
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eng.window-u-value-heat-loss Calculator
Calculates window heat loss from U-value, area, and inside/outside temperature difference, and compares to ENERGY STAR requirements. Window U-value of 0.20 BTU/h·ft²·°F (triple pane) reduces heat loss by 50% compared to a standard double pane (U=0.40).
Inputs
U Value W M2K
Reference formula or conversion factor shown for context.
Window Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Indoor Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Outdoor Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
heat loss (W)
The decrease or degradation from the baseline.
heat loss (kW)
The decrease or degradation from the baseline.
annual heating cost (est.)
The result expressed on a per-year basis.
U-value classification
Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.
Q = U·A·ΔT
Reference formula or conversion factor shown for context.