Select width for the Roman shade (NOT the window).
Recommendations: For inside mount, subtract 1/8", 1/4" or 3/8" from inside window width. For outside mount, measure window including frame and add 1/2" to 2" to measurement. For door mount, measure the glass pane part on your door, then add 1" to 1-1/2" making sure there are no obstructions.