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When providing the measurements for a window or door, the convention is to state the overall width (in millimeters) first, followed by the overall height (in millimeters). As an example, a window measuring 1800 x 1200 will be 1800mm wide and 1200mm high.

All windows need a little extra wiggle room to allow you to shim the window and square it in the opening. When ordering a replacement window, subtract 1/4 inch from both the width and height to determine the exact replacement size. Keep your original measurements in case the manufacturer recommends a greater clearance.

Measure the width of the window at the base. Extend your tape measure horizontally, from jamb to jamb or trim to trim. To measure the height of a casement window extend your tape measure vertically, from header to cell or drywall the sill. Be sure to capture both width and height measurements.

0:50 2:00 How to Measure Double-Hung Windows - YouTube YouTube Start of suggested clip End of suggested clip Now on your sash. Widths. It's usually easier to measure the lower one because you can see the edgeMoreNow on your sash. Widths. It's usually easier to measure the lower one because you can see the edge to edge on the width. We want to pull an edge to edge measurement on the sash. Now from the inside.

0:14 1:52 JELD-WEN: How to Measure for a Replacement Window (HD) YouTube Start of suggested clip End of suggested clip Now circle the smallest measurement. This is your width. Size next let's measure the height of theMoreNow circle the smallest measurement. This is your width. Size next let's measure the height of the window. Take one at the far. Left one in the center.

Whether you're learning how to measure for replacement vinyl windows, aluminum windows or casement windows, the dimensions of standard window sizes are presented as width x height. Measure the window width from the inside jamb on the left side and right side of the window in three places – the bottom, middle and top.

Measure from the high point of the sill of your window (the surface closest to the inside of the window) to the top of the window opening. Make three measurements: one at the left side, one at the center and one at the right side of the window. Use the smallest of these three height measurements to order the window.

Replacements for vinyl, aluminum, or casement windows are sized using width x height measurements. Use a good tape measure (to 1/16 of an inch) and do not round off numbers. Measure every window individually. Do not assume windows in the same room are the same size.