Use the selected unit throughout. Changing units converts your entries.
See a quick calculation example
Calculation example only: 120 in ceiling-to-floor − 96 in entered clearance = 24 in maximum planned drop. These are fictional inputs, not recommended clearance or product dimensions.
Load example Calculate drop Clear
To plan manually, subtract your required clearance from the ceiling-to-surface distance. This does not confirm that this product fits.
Optional: compare measurements from your selected light
Have the selected option’s drawing? Add its measurements below. If not, leave these fields blank and plan your space first.
Full installed hanging length (D), if known — optional
Use the ceiling-to-lowest-point dimension from your selected option’s drawing, in the unit chosen above.
Which length should I enter?
Which length should I enter?
Side-view example showing the canopy, suspension and light body. D is the complete distance from the ceiling mounting surface to the lowest point of the assembled light. Component boundaries vary by design.
D
Suspension Light body Canopy
Enter D: the full distance from the ceiling mounting surface to the light’s lowest point—not just the cable, chain or light body.
Single-suspension example. Use the assembled drawing for your selected option; multi-cable and adjustable-ring designs differ. Supplied cable length is not necessarily its installed length.
Generic measuring example only; not this product, not to scale and not an installation drawing.
Compare with my space
Optional: check stair opening space
Measure between the opening’s inside edges, allowing for projecting railings. Measure the light’s widest span in the same direction.
Stair opening — view from above
A centred fixture inside a rectangular clear opening, seen from above. W spans the clear opening between its inside edges. F spans the dashed maximum fixture envelope along the same direction. The two side spaces marked g are equal only when centred.
W F g g
Space on each side = (opening width − light width) ÷ 2
W: opening width. F: widest light width. g: space on each side when centred.
For a centred light only. Check the other direction and any obstacles separately; for an off-centre light, measure each side. This is not a safety clearance or fit approval.
See a quick calculation example
Example only: A 120 in opening and a 30 in-wide light leave 45 in on each side if centred. This is not an installation safety check or product-fit verdict.
Generic measuring example only; not this product, not to scale and not an installation drawing.
Load example Calculate side space Clear
