Blinds Size Calculator

Calculate window blinds dimensions for inside or outside mount.

Window Opening Width (in)

Window Opening Height (in)

Mount Type

Formula

Inside: Width = Opening - 0.25 in; Outside: Width = Opening + 3 in

What is inside mount vs outside mount?

Inside mount fits within the window frame. Outside mount covers it.

How much smaller should inside mount blinds be?

Deduct about 1/4 inch from the width for inside mount blinds.