From there multiply the width depending on your curtain type.
How to measure a bedroom window.
Use the smallest of these three height measurements to order the window.
Add 12 inches to each side 24 inches total.
The sill is not the horizontal trim board that extends from the wall.
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.
The sill is where the sash rests when closed.
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.
Make three vertical measurements on the left side of the window from the sill to the header then.
When measuring the width of your window it s important not to take just one measurement and assume it s correct.
For example a window marked to fit a 44 x 44 opening will actually measure around 43 x 43.
That s because the manufacturer adds half an inch to each of the size dimensions so the window can be installed with ease.
Measure the width of your window.
In many cases window frame width is not level from the top to the bottom.
Then to measure length measure downward from the inside top frame to where you want the valance to fall on the 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.
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.
Use the tape measure to measure from the sill to the top of the window opening.