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How to Measure Stair Width and Headroom for Moving
Stairs are where furniture moves stall, and usually because the measurements taken weren’t the ones that matter. The width that counts is between the handrail and the wall, and the headroom an item can actually use is less than the number you get with a tape held straight up. This guide shows how to measure a staircase for moving, and how to turn those measurements into the space an item really has.
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Usable width
Measure across the stairs at the narrowest point: from the handrail to the wall, or from rail to rail. Check at the top and bottom of the flight and anywhere a newel post, bracket, or bulge in the wall narrows it. Furniture has to pass the narrowest point, so that is the number to use.
Rise, run, and the number of steps
- Measure the rise: the height of one step, from one tread to the next.
- Measure the run: the depth of one tread, from the edge of one step to the edge of the next.
- Count the risers in the flight — for stairs with a landing, count each flight.
Headroom, and what an item can use
Headroom is measured straight up from the line of the step edges (the nosings) to the lowest point overhead — a ceiling, a beam, or the edge of the floor above. But an item carried up the stairs lies along the slope, and the room it has is measured square to that slope: headroom × cos(pitch), where the pitch is atan(rise ÷ run).
| Rise × run | Pitch | 80 in of headroom, square to the slope |
|---|---|---|
| 7 × 11 in | 32.5° | 67.49 in |
| 7.5 × 10 in | 36.9° | 64 in |
| 7.75 × 10 in | 37.8° | 63.23 in |
| 8.25 × 9 in | 42.5° | 58.97 in |
The steeper the stairs, the less of the measured headroom an item carried along them can use.
The ceiling where the stairs start and end
Measure the ceiling height at the foot of the stairs and at the head, where the item has to change from level to the slope and back. A low ceiling or bulkhead at the foot is a common bottleneck for long items, even when the flight itself is roomy.
Stair Width and Headroom FAQ
- How do I measure headroom on stairs?
- Straight up from the line joining the step edges to the lowest thing overhead, at the lowest point along the flight.
- Why is my usable headroom less than what I measured?
- An item on the stairs lies along the slope, so it gets the headroom measured square to the slope: your measurement × cos(pitch).
- Do I measure stair width including the handrail?
- No — measure from the handrail to the wall. The handrail takes up width furniture can’t use, unless it is carried above it.
- What is the pitch of a staircase?
- Its angle from level, atan(rise ÷ run). Stairs with 7.5 in risers and 10 in treads are pitched at about 36.9°.
- Do I need to measure every step?
- Measure a few to check they match. If they differ, use the steepest rise and shortest run for a conservative pitch.
Related guides
- Stair Landing TurnsWhy L- and U-shaped landings are harder than hallway corners, the room needed to spin an item on a landing, and the options when the landing is smaller than that.
- Stair Steepness and ClearanceHow a steeper staircase reduces the headroom an item can use and sharpens the bend at the foot and head of the stairs, with figures for pitches from 30° to 45°.
Open the tool
Jump into Stairwell Furniture Clearance Calculator when you are ready to process your files.
