Blind Measurement Worksheet
Check an opening's narrowest width and longest height, or add your planned outside coverage. This does not verify fit, factory deductions or the selected blind's order dimensions.
How to interpret the result
Inside mount: the worksheet reports the smallest of your three opening widths and the largest of your three heights. Many blind manufacturers use those values, but some products have different rules. Depth and handle clearance must still be checked against the exact product. The output is not a manufacturing order size and includes no factory deduction.
Outside mount: the worksheet simply adds left and right coverage to the visible opening width, then adds above- and below-opening coverage to height. The result is a chosen coverage rectangle, not a certified headrail, fabric or slat dimension. Check mounting support and the finished dimensions given by the supplier before purchase.
This tool operates in your browser; it does not send your measurement entries to a server. Read our complete guide to measuring inside- and outside-mount blinds for examples and limitations, and verify your selected product against LEVOLOR's wood-blind technical guide or Bali instructions as applicable. For homes with small children, the U.S. CPSC recommends cordless window coverings.
One example opening, two different ordering questions
Suppose you measure the opening at 35 7/8 inches at the top, 35 13/16 inches in the middle and 35 3/4 inches at the bottom. Measure its height at 59 7/8 inches on the left, 60 1/8 inches in the center and 60 inches on the right. These are illustrative tape readings, not measurements of a tested installation.
- Inside-mount planning: narrowest opening width = 35 3/4 inches; longest opening height = 60 1/8 inches. The width varies by 1/8 inch and the height varies by 1/4 inch across the sampled points. Keep all six raw readings for the supplier; do not subtract a guessed 1/2-inch clearance yourself.
- Outside-mount coverage: if the same opening is nominally 35 3/4 inches wide and 60 inches high, an illustrative 1 1/2-inch overlap on both sides produces 38 3/4 inches of desired coverage. Adding three inches above and two below produces 65 inches of desired coverage height. Those are coverage targets, not automatically the headrail or fabric order dimensions.
Which measurement should go on the order form?
Only the selected brand's exact measuring guide can answer that. Ask whether the form wants opening width, ordered blind width, headrail width or finished fabric coverage; the same numeral may describe different parts. For an inside mount, compare recess depth with the maker's flush-mount and minimum-installation-depth specifications. For an outside mount, confirm mounting space above the frame, brackets, obstructions and desired light control.
Stop before ordering if a handle, crank, tile return or out-of-square opening interferes with the proposed product. Measure each window as an individual item, retain the original six readings, and request the vendor's confirmation of deductions and tolerances in writing. In homes with children, follow current cordless-covering safety guidance rather than substituting a measuring worksheet for a product-safety decision.