1. Measure the depth of the top window frame; allow at least 1 ¼ for bracket installation. The bracket attaches to the top, not the sides.
2. Measure the width inside the window frame, from jamb to jamb.
3. Measure the height inside the window frame, from the top jamb to the windowsill.
4. Use the shortest width and the longest height measurements.
5. Order blinds or shades in the actual window size; no deductions needed. Our factory will already make a 3/8" width deduction. 

Outside Mount:

1. Measure and order the blind or shade to be the exact size you desire, ensuring it is both wider and taller than the window.
2. The width should be 4 inches wider than the window (2 inches on each side) to ensure no light enters from the sides. Alternatively, the width can align with any window molding.
3. The height should allow a minimum of 2 inches above the window for bracket installation. To fully clear the window when open, add 6 inches above window