Stairwell Furniture Clearance Calculator
Enter an item’s size with the stairs’ usable width, rise and run, number of steps, headroom, and ceiling heights to see whether it clears the flight, the bends at the foot and head, and any landing.
Stairwell Furniture Clearance Calculator calculates in your browser.
Check whether furniture clears a stairwell
Stairs are where moves go wrong: the passage is narrower than a hallway, the headroom an item can use is less than the number you measure, and the item has to bend from level to the slope and back. This calculator turns your rise and run into the stair’s pitch, converts the headroom you measure straight up into the room available square to the slope, and checks every carrying position against the flight’s usable width, that headroom, and the bends at the foot and head of the stairs. For L- and U-shaped stairs it checks whether the item can be turned on the landing. Every check uses a passage no roomier than your real one, so a pass is reliable; when a 3D manoeuvre might still work, it asks for more measurements. It is for anyone moving furniture between floors.
How to use the Stairwell Furniture Clearance Calculator
- Choose your unit and enter the item’s length, width, and height, and whether it may go on its side.
- Measure the usable stair width at its narrowest (handrail to wall, or rail to rail), and one step’s rise and run; count the steps.
- Measure the lowest headroom over the stairs straight up from the line of the step edges, and the ceiling height where the stairs start and end.
- Choose the stair shape and, for a landing, enter its width, depth, and headroom.
- Read the result, the stair passage square to the slope, and each position checked.
How the check works
Pitch = atan(rise ÷ run); headroom square to the slope = headroom × cos(pitch)
Flight: across ≤ usable width and thickness ≤ headroom square to the slope
Bends at the foot and head: length ≤ the longest rigid item that can bend between the level ceiling height and the stair passage at the pitch angle
Landing: √(length² + across²) ≤ the landing’s smaller side
Examples use stairs 36 in wide with 7.5 in risers and 10 in treads (a 36.9° pitch), 13 steps, 80 in of headroom, and 96 in ceilings, so the passage is 36 × 64 in square to the slope. Spinning a 70 × 20 in footprint on a landing needs √(70² + 20²) ≈ 72.8 in.
| Item (L × W × H) | Stairs | Result | Carrying position checked |
|---|---|---|---|
| 72 × 30 × 30 in | Straight flight | Likely fits | Length along the slope, width across |
| 80 × 60 × 40 in | Straight flight | Does not fit under the conditions checked | Length along the slope, height across |
| 70 × 20 × 20 in | L landing 40 × 40 in | Additional measurements required | Length along the slope, width across |
| 70 × 20 × 20 in | L landing 73 × 75 in | Likely fits | Length along the slope, width across |
| 72 × 30 × 30 in | Winders | Additional measurements required | Length along the slope, width across |
Calculated on your device
- The check runs in your browser as you type; nothing is sent to a server.
- Your measurements and results are not sent to Looty Tools or stored.
- The calculator area, including the diagram, is masked from session-recording analytics, so what you enter isn’t captured in recordings.
Limitations
- The stairwell is modelled as a passage no roomier than your narrowest measurements: a level ceiling at the foot and head and a ceiling parallel to the stairs at the lowest headroom. Extra room in front of the first step or above the stairs isn’t counted.
- Items are rigid boxes carried along the slope. Carrying an item above the handrail, removing a rail, or tilting it sideways is not modelled.
- Landings are confirmed only when the item can be spun round on the landing; tighter landing turns need a 3D pivot over the steps or rail, so they get “additional measurements required”.
- Winders and spiral stairs are not modelled. This is not a 3D collision simulation.
- Sizes up to 100 ft (30.48 m) in inches, feet, centimeters, or meters; 2 to 60 steps; pitches between 10° and 60°.
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- Will My Sofa Fit Through the Door CalculatorCheck whether a sofa can pass through a doorway.
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- Mattress Through Doorway Fit CalculatorCheck whether a mattress can pass through a doorway.
- Hallway Corner Turn CalculatorEstimate whether furniture can make a turn through a hallway.
Guides
- Sofa Delivery ChecklistWalk the route from the curb to the room before ordering a sofa: what to measure at each door, corner, and staircase, and what each measurement decides.
- Why Box Springs Get StuckA box spring is a rigid frame, so it only fits where its exact measurements do. How that changes doorways and stairs, and the usual fixes from split foundations to low-profile bases.
- Stair Width and HeadroomMeasure a staircase for moving furniture: usable width at the handrail, rise, run, and headroom, and how to turn measured headroom into the room an item has along the slope.
- 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°.
Stairwell Furniture Clearance Calculator FAQ
- How much headroom does furniture really have on stairs?
- Less than the number you measure straight up. Headroom is measured vertically from the line of the step edges, but an item carried along the slope needs room square to it: headroom × cos(pitch). 80 in of headroom over 7.5 in risers and 10 in treads (a 36.9° pitch) is 64 in square to the slope.
- Why is the bottom of the stairs often the problem?
- The item has to bend from level to the stair’s pitch, and a low ceiling or bulkhead at the foot limits how long it can be. Under a 22 in-high gap, a 20 in-thick item can bend onto a 37° flight only if it is at most about 111 in long.
- Can furniture get round a landing?
- The calculator confirms it only when the item fits on the landing and can be spun round there — a 70 × 20 in footprint needs about 72.8 in. Anything tighter needs a 3D pivot over the steps or rail that can’t be checked from a few measurements, so it asks for more rather than guessing.
- Does it handle winders or spiral stairs?
- No. Stairs that turn as they climb change direction and height together, which this calculator doesn’t model. It still checks the cross-section against the narrowest width and headroom, so a definite no stands; anything else is “additional measurements required”.
- Should I measure width at the handrail?
- Yes — usable width is the narrowest gap, usually handrail to wall or rail to rail. Movers sometimes carry an item above the rail to gain a little width, and some rails come off; neither is counted here, so re-measure if you plan either.
- Are the measurements I enter sent anywhere?
- No. The check runs in your browser as you type. Your measurements and results are not sent to Looty Tools or stored, and the calculator area is masked from session-recording analytics. Refreshing the page clears it.
