Worked hanging guide
How to measure a gallery wall on stairs
A stair gallery should follow a deliberate rising reference line, not a series of independent guesses from each tread. Record rise and horizontal run, choose repeated center intervals, and test the complete arrangement with paper.
Measure one consistent stair segment
Record the vertical rise and horizontal run across representative steps. Floors and stairs can vary, so verify several locations instead of relying only on nominal construction dimensions. In this example, the rise is 7.5 inches for a 10-inch run.
stair slope ratio = 7.5 ÷ 10 = 0.75Translate horizontal movement into vertical rise
If adjacent frame centers are 20 inches apart horizontally, multiply that run by the 0.75 slope ratio. Each center rises 15 inches relative to the previous center.
vertical center change = 20 × 0.75 = 15 inChoose the visual offset from the stairs
The slope gives direction, not the correct distance above the handrail or treads. Architecture, sight lines, frame size, and safe clearance determine the offset. Mark a temporary reference line with removable tape or a laser, then judge it from both the bottom and top landings.
Place paper templates before hardware
Cut every template to the real outer frame size and mark its center plus the measured hardware contact point. Arrange the templates along the rising reference, then measure each final hook from a stable floor or stair reference. Do not stand on improvised supports or obstruct the stair while testing.
Know the calculator limitation
The mixed-frame planner can organize the frames and show center offsets on a rectangular canvas, but it does not automatically rotate the layout to match a staircase. Use its dimensions as a composition draft, then apply the verified stair slope and paper-template method on site.
For the final transfer, follow the paper template guide and ask a qualified installer when access or wall construction makes the work unsafe.