Measurement Guide

How to measure for curtain rods:
Measuring for an outside mount: Generally for an outside mount,
window hardware is mounted one to three inches above the top edge
of the window frame.
To determine the rod length, add the stack backs of the curtain with
the window clearance.
To give your windows the illusion that they are much wider, extend
your curtain rod 5-10 inches beyond the window frame.