For example a window marked to fit a 44 x 44 opening will actually measure around 43 x 43.
How to measure a bedroom window.
From there multiply the width depending on your curtain type.
Measure the width of your window.
To measure for a valance measure the width of the window from the inside left of the frame to the inside right of the frame.
Make three vertical measurements on the left side of the window from the sill to the header then.
Take the total number width plus the number you added to each side and divide that number by how many drapery panels you want in the window.
The actual measurements of the window are usually 1 2 inch less than the whole number identifier it is labeled as.
When measuring for width position the tape measure against the window.
Add 12 inches to each side 24 inches total.
One at the left side one at the center and one at the right side of the window.
That s because the manufacturer adds half an inch to each of the size dimensions so the window can be installed with ease.
Use the smallest of these three height measurements to order the window.
As a result you should take three measurements one at the top one in the middle and one at the bottom to get a more accurate number.
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.
In many cases window frame width is not level from the top to the bottom.
Measure the width of the existing window in three places at the bottom at the middle and at the top.
When measuring the width of your window it s important not to take just one measurement and assume it s correct.
The sill is where the sash rests when closed.