The process of measuring your window for blinds differs depending on whether you have inside mount blinds or outside mount blinds. Follow the steps below with consideration for the type of blinds you plan to install:
Inside mount blinds:
Measure your window frame’s depth.
Measure your window’s width in three places: top, middle, and bottom. Use the smallest of these numbers as your final measurement.
Measure the height of your window in three places: left, right, and center. Depending on the type of blinds or shade you are installing, you will either use the smallest or the largest of these measurements.
Do not deduct anything from your width or height measurements, as manufacturers will already account for allowances and deductions.
Outside mount blinds:
Measure the width you would like your blinds to cover, including at least 1 ½” on both sides for optimal coverage.
Measure height, starting from the point your blinds will be hung, down to the window sill. Be sure to leave 1 ½” – 2” of overlap on top to account for your blinds’ mounting hardware.
Again, do not deduct anything from your measurements, as this will be accounted for by manufacturers.