Determine inside or outside Determine if the blinds will be mounted inside or outside the window frame in your home
Measure for outside mounted blinds Measure the exact height and width you want your blinds to cover for outside mounted blinds
Use a steel tape measure Use a tape measure and measure to the nearest eighth of an inch for accuracy
Measure from top to bottom Measure from top to bottom inside the frame in three places. Round up to the nearest eighth of an inch and write down the longest measurement.
Measure the depth Measure the depth of the frame to confirm the blinds you have chosen fit in the opening.
Measure from side to side Measure from the inside of the right frame to the inside of the left frame on the top, middle, and bottom of the window for inside mounted blinds. Round down to the nearest eighth of an inch and record the smallest measurement