Will a wooden desk (122x61x76 cm) Fit Up 91 cm Stairs?

−1 ft over

· ON THE WIDTH AXIS

It fits with clearance on every axis.

Your wooden desk will fit through the stairway, with a comfortable margin.

Clearance +4 in at the tightest point

AStair slope angle✓ PASS

\theta_{\text{slope}} = \operatorname{atan2}(\text{riser}, \text{tread})

↓ SUBSTITUTE

\operatorname{atan2}(7, 10)

Plain English: Slope of the stair run from riser-over-tread geometry.

BTilted carry envelope✓ PASS

h_{\text{eff}}(\theta) = \text{vert}\cos\theta + \text{along}\sin\theta

↓ SUBSTITUTE

30\cos(35^\circ) + 48\sin(35^\circ)

Plain English: Vertical envelope of a tilted item being carried up stairs.

CAxis inequality · stair width✓ PASS

d_{\text{item}} \;\le\; d_{\text{space}}

↓ SUBSTITUTE

24 \;\overset{?}{\le}\; 28.1\quad(\text{stair width})

↓ EVALUATE

24\,\text{in} \;\le\; 28.1\,\text{in} \;\Longrightarrow\; \Delta = +4.1\,\text{in}

Plain English: Along the stair width, the item is 24 in and the space allows 28.1 in — 4.1 in to spare.

D3D space diagonal✓ PASS

\mathcal{D}_{3D} = \sqrt{L^2 + W^2 + H^2}

↓ SUBSTITUTE

\sqrt{48^2 + 24^2 + 30^2}

↓ EVALUATE

61.5\,\text{in} \;\le\; 84.8\,\text{in} \;\Longrightarrow\; \Delta = +23.3\,\text{in}

Plain English: Corner to corner the item reaches 61.5 in — keep that swing room in mind for the turn after.

Orientation	Width	Height	Result
—	-20 in	3 ft 5.5 in	✕
—	4 in	2 ft 4 in	✓
—	-20 in	3 ft 7 in	✕
—	-2 in	2 ft 9 in	✕
—	4 in	1 ft 11.5 in	✓
—	-2 in	2 ft 3 in	✕

Margins shown are calculated; allow ±¼ in for tape-measure precision.

How the stair-passage check works

Stairs care about ceiling clearance on the incline plus stair-width clearance for the carrying motion; treat the item’s diagonal as the effective length.

Use the standard residential stair geometry: 7 in rise per step, 11 in run, ~37° incline.
Project the item’s diagonal across the incline to get the effective length the stairwell must clear.
Apply the ceiling-clearance constraint to the carry pose (item tilted along the incline).
Apply the stair-width constraint to the item’s narrow cross-section so movers can step alongside.
Verdict ladder (verdict-tiers.js, shared with door): FITS ≥ 2 in; FITS_TIGHT 0.5–2 in; FITS_VERY_TIGHT 0–0.5 in; DOESN'T_FIT below.

Tread / rise / incline use ASTM-style residential averages (7 in rise, 11 in run, ~37° pitch); commercial stairwells differ.

Similar calculations

3 ft chair up 3 ft stairsDOESN'T FIT

3 ft fridge up 3 ft stairsDOESN'T FIT

5 ft queen size mattress up 4 ft stairsDOESN'T FIT

6 ft headboard up 6 ft stairsFITS

Run your own fit check

Ask about a different item, door, or route. Free, no signup.

Will a wooden desk (122x61x76 cm) fit up 91 cm stairs?

Expert analysis

It fits with clearance on every axis.

Dimensions

Space geometry

Handling

Similar calculations

Run your own fit check