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Calcimator

Window-to-Wall Ratio Calculator

Calculate window-to-wall ratio and check energy code compliance by climate zone with energy penalty estimates.

Inputs

sq ft
sq ft

Results

Window-to-Wall Ratio

25%

Max Allowed (Code)

30%

Code Compliant

1

Energy Penalty0%
How to Use This Calculator
  1. Enter Total Window Area in sq ft — the sum of all window rough openings.
  2. Enter Total Wall Area in sq ft — the gross exterior wall area above grade.
  3. Enter the ASHRAE Climate Zone (1 = hot tropical, 8 = subarctic) for code compliance checking.
  4. Review Window-to-Wall Ratio percentage and the Code Maximum Allowed for your climate zone.
  5. Check Code Compliance status and Energy Penalty percentage if over the allowable ratio.
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