Item Fits

DOESN'T FIT

It doesn't fitby 6 in too large

Will a fridge (91x86x178 cm) fit up 91 cm stairs?

fridge· 3 ft × 34 in × 5 ft 10 in

−6 in (+0%)too large at tightest point

Item being fitted

fridge3 ft × 34 in × 5 ft 10 in

Space clearance

Stairs3 ft

Result

6 in too large

▸ width axis · binding

See the full fridge stairs guide →

Expert analysis

A fridge measuring 36 in × 34 in × 70 in does not fit up stairs, but it's about 6 in too large at the tightest point. One caveat: item is rigid and cannot be compressed, bent, or disassembled.

How we verified this

Binding axis: Stair width
Tightest clearance: 6 in over
Orientations checked: 6
Result: Stair width exceeds the opening

+0 in clearance

· ON THE WIDTH AXIS

It exceeds the opening at the tightest point.

Your fridge will not fit through the stairway — and it is clearly over the limit at the tightest point.

Handling: The item exceeds the space in every orientation — standard entry won't work.

3 ft vs 3 ft

Clearance +0 in (+0.0%) on the WIDTH axis

AStair slope angle✓ PASS

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

↓ SUBSTITUTE

\operatorname{atan2}(7.5, 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

70\cos(37^\circ) + 36\sin(37^\circ)

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

CAxis inequality · stair width✕ FAIL

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

↓ SUBSTITUTE

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

↓ EVALUATE

34\,\text{in} \;>\; 28.1\,\text{in} \;\Longrightarrow\; \Delta = -5.9\,\text{in}

Plain English: Along the stair width, the item is 34 in and the space allows 28.1 in — over by 5.9 in.

DDiagonal clearance · Pythagorean✓ PASS

\sqrt{a^2 + b^2} \;\le\; \sqrt{a_{\text{sp}}^2 + b_{\text{sp}}^2}

↓ SUBSTITUTE

\sqrt{34^2 + 70^2} \;\overset{?}{\le}\; \sqrt{28.1^2 + 80^2}

↓ EVALUATE

77.8\,\text{in} \;\le\; 84.8\,\text{in} \;\Longrightarrow\; \Delta = +7\,\text{in}

Plain English: Tilted corner-to-corner the face spans 77.8 in, inside the opening's 84.8 in diagonal — but a tilt only buys diagonal room, it can't widen the throat.

E3D space diagonal✕ FAIL

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

↓ SUBSTITUTE

\sqrt{36^2 + 34^2 + 70^2}

↓ EVALUATE

85.7\,\text{in} \;>\; 84.8\,\text{in} \;\Longrightarrow\; \Delta = -0.9\,\text{in}

Plain English: Corner to corner the item reaches 85.7 in — keep that swing room in mind for the turn after.

FMinimum required space · stair width✕ FAIL

d_{\text{req}} = d_{\text{item}} + t

↓ SUBSTITUTE

34 + 2 = 36

Plain English: Smallest space on the limiting axis that would admit this item (with handling tolerance).

GLargest item that fits · stair width✕ FAIL

d_{\max} = d_{\text{space}} - t

↓ SUBSTITUTE

28.1 - 2 = 26.1

Plain English: Largest item dimension this space admits on the limiting axis (after handling tolerance).

Orientation	Width	Height	Result
upright front-first	—	—	✕
upright side-first	—	—	✕
on side, front-first	—	—	✕
on side, side-first	—	—	✕
laid flat, depth across	—	—	✕
laid flat, height across	—	—	✕

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 french-door fridge in a 36 in spaceVERY TIGHT

35 in Fridge by through a 32 in doorwayDOESN'T FIT

33 in french door fridge in a 33 in spaceDOESN'T FIT

33 in french door fridge in a 35 in spaceFITS TIGHT

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Will a fridge (91x86x178 cm) fit up 91 cm stairs?

Expert analysis

It exceeds the opening at the tightest point.

Dimensions

Space geometry

Handling

Similar calculations

Run your own fit check