Window Blinds Size Calculator
Calculate the correct blinds dimensions for your windows based on width, height, and mount type (inside or outside mount).
Recommended Blinds Size
Blinds sizing depends on whether you choose an inside mount (within the window frame) or outside mount (above and beyond the frame).
Inside Mount:
- Width: Measure at top, middle, and bottom. Use the narrowest measurement.
- Height: Measure left, center, and right. Use the longest measurement.
- Most manufacturers will deduct 1/4" to 1/2" from width for clearance.
Outside Mount:
- Width: Add 3 inches (7.5 cm) on each side (6 inches total) beyond the frame
- Height: Add 3 inches (7.5 cm) above the frame and 1 inch (2.5 cm) below the sill
Minimum depth for inside mount:
- Mini blinds: 1" (2.5 cm)
- Faux wood: 2.5" (6.5 cm)
- Cellular shades: 1.5" (4 cm)
- Roller shades: 1.5" (4 cm)
Always measure each window individually as sizes can vary.