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eng.window-to-wall-ratio Calculator
Calculates Window-to-Wall Ratio (WWR) and its impact on building heating, cooling, and daylighting energy loads. WWR above 40% significantly increases cooling load in commercial buildings — ASHRAE 90.1 energy code limits require performance path compliance for high-WWR façades.
Inputs
Window Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Wall Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
U Value Window
Reference formula or conversion factor shown for context.
U Value Wall
Reference formula or conversion factor shown for context.
Results
window-to-wall ratio (WWR)
The proportional relationship between two quantities.
average U-value (W/m²K)
The arithmetic mean -- sum divided by count.
window heat loss vs wall
The decrease or degradation from the baseline.
ASHRAE target WWR
Reference formula or conversion factor shown for context.
daylighting benefit
Sample size or count used in the calculation.
total wall + window area
The combined total across all inputs and components.