How the calculation works
The formulas
Choose fixed gaps to centre the arrangement, or minimum symmetric margins to distribute the available width and height as equal gaps. Frame positions are measured from the upper-left of the available area.
Arrangement width = columns × frame width + (columns − 1) × gapX
GapX from margins = (available width − 2 × marginX − columns × frame width) / (columns − 1)
Frame X = left margin + column index × (frame width + gapX)
Assumptions to check
- Frames have equal outer dimensions. Hanger offsets, wall anchors, and frame mass are outside the calculation.
- A single frame is centred on its axis. Negative gaps or insufficient margins trigger a no-fit warning.
A worked example
Three 0.4 m frames with 0.1 m gaps form a 1.4 m-wide row. In a 3 m space, left and right margins are 0.8 m.