Will a queen size mattress (152x203x25 cm) Fit Up 132 cm Stairs?

−8 in over

· ON THE WIDTH AXIS

It exceeds the opening at the tightest point.

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

5 ft vs 4 ft 4 in

Overage −8 in (−15.5%) on the WIDTH axis

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✕ FAIL

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

↓ SUBSTITUTE

60\cos(35^\circ) + 80\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

10 \;\overset{?}{\le}\; 44.1\quad(\text{stair width})

↓ EVALUATE

10\,\text{in} \;\le\; 44.1\,\text{in} \;\Longrightarrow\; \Delta = +34.1\,\text{in}

Plain English: Along the stair width, the item is 10 in and the space allows 44.1 in — 34.1 in to spare.

DDiagonal clearance · Pythagorean✓ PASS

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

↓ SUBSTITUTE

\sqrt{10^2 + 60^2} \;\overset{?}{\le}\; \sqrt{44.1^2 + 80^2}

↓ EVALUATE

60.8\,\text{in} \;\le\; 91.3\,\text{in} \;\Longrightarrow\; \Delta = +30.5\,\text{in}

Plain English: Tilted corner-to-corner the face spans 60.8 in, inside the opening's 91.3 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{80^2 + 10^2 + 60^2}

↓ EVALUATE

100.5\,\text{in} \;>\; 91.3\,\text{in} \;\Longrightarrow\; \Delta = -9.1\,\text{in}

Plain English: Corner to corner the item reaches 100.5 in — keep that swing room in mind for the turn after.

FMinimum required space · stair headroom✕ FAIL

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

↓ SUBSTITUTE

95 + 2 = 97

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

GLargest item that fits · stair headroom✕ FAIL

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

↓ SUBSTITUTE

80 - 2 = 78

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

Orientation	Width	Height	Result
—	-404 mm	66 cm	✕
—	-912 mm	95 cm	✕
—	-404 mm	22 cm	✕
—	87 cm	-507 mm	✕
—	-912 mm	64 cm	✕
—	87 cm	-382 mm	✕

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.

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Will a queen size mattress (152x203x25 cm) fit up 132 cm stairs?

Expert analysis

It exceeds the opening at the tightest point.

Dimensions

Space geometry

Handling

Similar calculations

Run your own fit check