How it works
All items have the same width. Positions are measured from the left edge of the available span. Equal-gap mode includes identical empty gaps at both ends. Fixed-inset mode places the first and last centers at your stated inset, then spaces remaining centers equally. One item is centered regardless of inset. Marks locate item centers, not necessarily hangers or mounting holes.
The formulaEqual edge gap = (span − count × item width) / (count + 1)
Center = edge gap + half item width + index × center pitch
Fixed-inset pitch = (span − 2 × center inset) / (count − 1)
Center = edge gap + half item width + index × center pitch
Fixed-inset pitch = (span − 2 × center inset) / (count − 1)