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Measure the width at the top, middle, and bottom. Then, measure the height at the left, center, and right.

Many pros recommend subtracting 1/8" (about 3mm) from your final width and height to provide "fitting tolerance" so the glass isn't too tight to install. buy window glass online

Do not measure the old broken glass, as it may be chipped or incorrectly sized. Measure the frame opening where the glass sits. Measure the width at the top, middle, and bottom