Box-shaped furniture
Sofas, wardrobes, cabinets, desks, washing machines and fridges can be entered when you can supply three outer dimensions of the item as it will be carried.
Doorway & room fit analysisReal computation · no sign-up
Fit analysis tool
Enter real measurements. The engine computes six orientations against a clear doorway aperture and a static room volume, then returns one explained verdict with its limits stated.
Current resultPASS
A
Furniture
Outer bounding-box dimensions in the selected unit.
Fills example dimensions for this type. They are suggestions, not your measurements.
mm
mm
mm
B
Doorway
Use NET clear opening, not the outer frame size.
mm
mm
mm
Optional. Leave blank if you did not measure it.
C
Room
Interior width, length and ceiling height.
mm
mm
mm
Corridor width
The current engine does not model corridor width, so corridor turning is not analysed.
D
Calculation settings
Unit changes the display only; the physics stays in millimetres.
mm
Optional extra operating margin applied to both doorway axes.
Drag the furniture in the 3D view, or use the axis controls for exact offsets.
Example sets
05
Linked 3D scene
Mesh, aperture, room envelope and labels all come from one result object.
WebGL · loading
◐ Drag empty space to orbit✥ Drag the box to move⇅ Scroll to zoom
The blue wireframe is the bounding box of the selected posture — the box the engine actually measured, not the furniture surface. Only the six axis-aligned postures are modelled; arbitrary-angle rotation is not.
Three.js · R3F · Drei
Overall status
PASSv2.0.0
All tested checks pass with operating margin, and one posture satisfies both the doorway and the room.
Doorway section
PASS
Room volume
PASS
- Calculation
- 2.0.0
- Scope
- Section + static volume only
- Recommended posture
- Upright
R
Why this verdict
The selected posture passes the doorway section check.
DOORWAY_SECTION_PASS
The selected posture fits the static room volume.
ROOM_FIT_PASS
D
Dimension comparisons
| Required | Available | Remaining | |
|---|---|---|---|
| Doorway clear width | 800 mm | 900 mm | +100 mm |
| Doorway clear height | 750 mm | 2000 mm | +1250 mm |
| Room width | 800 mm | 3000 mm | +2200 mm |
| Room length | 1800 mm | 4000 mm | +2200 mm |
| Room height | 750 mm | 2600 mm | +1850 mm |
Projection vs clearance
Required projection against the available clear opening.
!
Conflicts
No numeric conflicts were found.
L
Stated boundaries
Rectangular bounding boxes only; real furniture shape and deformation are not modelled.
BOUNDING_BOX_ONLY · does not change the verdict
Only six axis-aligned postures were tested; no continuous-angle search was run.
AXIS_ALIGNED_POSES_ONLY · does not change the verdict
The carrying route, stair turns and corridor segments are not simulated.
PATH_NOT_MODELLED · does not change the verdict
Door leaves, handles, handrails and other obstacles are not modelled.
DOOR_LEAF_AND_OBSTACLES_NOT_MODELLED · does not change the verdict
Rotation within the frame depth is not simulated.
FRAME_DEPTH_ROTATION_NOT_MODELLED · does not change the verdict
Moving or turning the object inside the room is not simulated.
ROOM_PATH_NOT_MODELLED · does not change the verdict
08
Interactive placement
Drag the furniture in the 3D view, or use the axis controls for exact offsets.
STATIC POSITION ONLYSTATIC_POSITION_ONLY
Position feedback is a static geometric check. It is not a transport-path simulation and never changes the fit verdict.
Fit verdict is unchanged by position
0 mm
0 mm
0 mm
Offset from default: 0 / 0 / 0 mm
Remaining space to room planes
Left wall1100 mm
Right wall1100 mm
Floor0 mm
Ceiling1850 mm
Doorway wall (Z = 0)1100 mm
Back wall1100 mm
Boundary intersections
No boundary intersection at this position
Doorway section preview
Width remaining100 mm
Height remaining1250 mm
SECTION_ONLY
06
3D data linkage
These metre values are read back from the scene payload, not recomputed in the component.
| Oriented AABB (m) | mm | |
|---|---|---|
| Furniture local box (m) | 0.800 × 0.750 × 1.800 m | 800 mm × 750 mm × 1800 mm |
| Oriented AABB (m) | 0.800 × 0.750 × 1.800 m | 800 mm × 750 mm × 1800 mm |
| Clear aperture (m) | 0.900 × 2.000 × 0.180 m | 900 mm × 2000 mm × 180 mm |
| Room envelope (m) | 3.000 × 2.600 × 4.000 m | 3000 mm × 2600 mm × 4000 mm |
- Changing any dimension recomputes the projection, both local checks, the overall verdict and the 3D mesh.
- Switching the display unit changes the labels only; the physical geometry stays identical.
- Switching posture changes the projected section and oriented bounding box, while the local furniture box stays the same size.
- The result names its conflicts, limitations and assessment scope instead of hiding them behind a single colour.
07
All six tested postures
Projected section per posture
| Posture | Door | Room | Both | Section W | Section H | Depth |
|---|---|---|---|---|---|---|
| Upright | Yes | Yes | Yes | 800 mm | 750 mm | 1800 mm |
| Upright · quarter turn | Yes | Yes | Yes | 750 mm | 800 mm | 1800 mm |
| Lengthwise | No | Yes | No | 1800 mm | 750 mm | 800 mm |
| Lengthwise · quarter turn | Yes | Yes | Yes | 750 mm | 1800 mm | 800 mm |
| On side | Yes | Yes | Yes | 800 mm | 1800 mm | 750 mm |
| On side · quarter turn | No | Yes | No | 1800 mm | 800 mm | 750 mm |
Remaining clearancedoor 100 mm / 1250 mm · room 2200 mm / 1850 mm / 2200 mm
What you can enter
Which furniture this calculator can describe
The geometry engine treats one item as a single rectangular box with a length, a width and a height. It does not classify products, and it does not model curved or soft shapes.
Beds and mattresses
Enter the outer size in the state you intend to move. A folded, rolled or disassembled item has different dimensions and needs its own measurement.
What is not modelled
Curved surfaces, soft deformation, detachable legs and irregular outlines fall outside the model. The result is a bounding-box comparison, not a shape-accurate fit.
The preset values in this tool are illustrative sample inputs, not measured furniture specifications.
Inputs explained
What each field means
All dimensions are stored in millimetres. Changing the display unit changes labels only; the physical geometry stays identical.
01
Furniture
Outer length, width and height of the item. Millimetres, centimetres, inches and feet are accepted, with 1 in = 25.4 mm and 1 ft = 304.8 mm.
- Furniture length
- Furniture width
- Furniture height
02
Doorway
Clear width and clear height mean the net opening between the innermost fixed surfaces, not the door leaf size. Frame depth is optional; leaving it empty is recorded as a limitation.
- Clear width
- Clear height
- Frame depth
03
Room
Width, length and height of a static rectangular room volume. The room check compares the oriented box against this volume; it does not simulate a carrying route.
- Room width
- Room length
- Room height
04
Options
Posture selects one of six axis-aligned orientations. Extra clearance is an operating margin you require on top of a bare size match.
- Extra clearance
Parsing rejects thousands separators, unit suffixes, empty, zero, negative and non-numeric values rather than guessing.
How to use
Using the fit calculator
The tool recomputes on every change. Work through the fields once, then read the verdict and the evidence tables.
- 01
Measure the furniture
Record the outer length, width and height of the assembled item in the state you will carry it.
- 02
Measure the opening
Record the net clear width and height of the doorway. Add frame depth if you can measure it.
- 03
Enter the room and options
Enter room width, length and height, choose a posture, and set any extra operating clearance you require.
- 04
Read the whole result
Check the overall status, the reason list, the six-pose matrix and the remaining clearances. Change one input at a time to see what drives the verdict.
Reading the result
What the four outcomes mean
The status is produced only by the geometry engine. The page never assembles a verdict from colours or from a single comparison.
PASS
Every tested local check passes with operating margin, and one posture satisfies both the doorway and the room.
CONDITIONAL
The geometry is not definitively clear: a different posture is needed, a blocking limitation applies, or no single posture satisfies both checks.
FAIL
At least one local check fails for every tested posture.
Invalid input
At least one input is invalid, so the engine returns a structured INVALID_INPUT failure and produces no geometric verdict.
The interactive 3D drag is a static-position preview. It reports its own gaps and collisions, and it never rewrites the overall status.
Calculation method
How the verdict is computed
One normalised millimetre model feeds both the result and the 3D scene. Nothing on this page recomputes geometry independently.
01
One unit, one model
Millimetres are the single canonical unit. The 3D scene converts to metres only at render time.
02
Six axis-aligned postures
Each posture applies a 3 by 3 rotation matrix combined as Rz, Ry then Rx. The oriented bounding box is the absolute matrix multiplied by the local dimension vector.
03
Two separate checks
The doorway check is a section-only comparison of the projected cross-section against the net aperture. The room check is a static-volume comparison against the rectangular room.
04
Explicit status merge
Any failing local check yields FAIL. Any conditional check, blocking limitation or absence of a single posture that satisfies both checks yields CONDITIONAL. Otherwise PASS.
05
Named boundaries
Conflicts, clearances and limitations are reported from real box faces. A flush contact with zero clearance is reported, not silently treated as a pass.
Calculation version 2.0.0. No continuous-angle search is implemented.
Maintenance and version
- Published
- Updated
- Calculation version
- 2.0.0
Maintenance responsibility: These pages are maintained together with the calculation engine in this repository. A change to the geometry or verdict logic requires the published method statement and its automated checks to be updated in the same change. There is no separately credited editorial team and no external reviewer.
Read the full calculation method and concept definitions
Scope and limits
What this calculator does not decide
These are real limits of the current engine, not disclaimers added for appearance.
- Only rectangular bounding boxes are modelled; real furniture shape and deformation are not.
- Only six axis-aligned postures are tested; continuous-angle rotation is not searched.
- Carrying routes, stair turns and multi-segment corridors are not simulated.
- Door leaves, handles, handrails, skirting boards and other obstacles are not modelled.
- Rotation inside the frame depth is not simulated, and a missing frame depth is reported rather than guessed.
- Moving or turning the object inside the room is not simulated; the room check is a static volume comparison.
- The 3D drag is a static-position preview; position changes never alter the verdict.
When the information is insufficient for a real judgement, the result must be CONDITIONAL and name what is missing.
Tool FAQ
Questions about using this page
Q1Do I measure the door leaf or the opening?
Measure the clear net opening between the innermost fixed surfaces, meaning the width and height actually available to pass the object. The door leaf itself is not modelled.
Q2Why does a dimension that exactly equals the opening not pass?
A flush contact leaves no operating margin. The engine reports ZERO_CLEARANCE and returns CONDITIONAL instead of treating a zero-gap fit as a deterministic pass.
Q3Can I rotate the furniture to any angle?
No. Six axis-aligned postures are tested. Continuous-angle search is not implemented in this version.
Q4Does dragging the 3D model change the verdict?
No. The drag is a static-position preview with its own gap and collision feedback. The overall verdict comes from the dimension-based engine and stays unchanged.
Q5Why is frame depth optional?
If it is left empty, the engine cannot assess rotation inside the frame depth. It records MISSING_FRAME_DEPTH as a limitation instead of inventing a value.
Related pages
Where to go next
These pages are live on this site. Three are in-depth measurement and fit guides; the fourth is the technical 3D proof.
How to measure a doorwayWhere to take the clear width and height, why the smallest reading wins, and what the engine does with those numbers.Will my sofa fit through the door?A worked sofa-versus-doorway case showing why a conditional verdict can require a different pose.Furniture dimensions explainedHow length, width and height become an axis-aligned bounding box in each of the six tested poses.3D Technical LabThe informational 3D proof-of-concept page. It shows the same normalised geometry but deliberately does not output a fit verdict.
Three further guides cover sofa measurement, refrigerator clearance and bed-frame fit; each is linked from the related-pages section of every guide above.