Window Size Calculator
Window Area & Glass Size
Calculate window glass area and light exposure
Window Replacement Cost
Estimate the cost of replacement windows
Formula
Glass Area = (W × H) × (1 - Frame %) | Rough Opening = Window Size + 1" | Ventilation = Glass Area × Type Factor
Frequently Asked Questions
What are standard window sizes?
Common residential window sizes: 24"×36", 28"×54", 32"×52", 36"×48", 36"×60". Double-hung windows typically range from 24"-48" wide and 36"-72" tall. Always measure your existing opening before ordering.
How do I measure for replacement windows?
Measure width at three points (top, middle, bottom) and use the smallest. Measure height at three points (left, center, right) and use the smallest. Measure diagonals to check for square. The replacement window should be ordered to the exact smallest measurements.
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