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Small Desk Dual Monitor Setup: Fit Two Screens and a Laptop
Measure the usable surface, the screen envelope and the working position before you buy another monitor or arm.
The short answer
Do not size the setup from monitor diagonals. Use the actual outer dimensions, the stand or arm geometry, the laptop’s open footprint and your working distance.
Width is the number the product name gets you closest to. Depth can fail even when width passes — and depth is the one dimension a diagonal cannot predict.
The premise
A diagonal describes the panel. Your desk holds the object.
A monitor diagonal is a description of the panel. Your desk has to hold the object — the chassis around that panel, the thing holding it up, and the laptop you did not stop using.
Dell publishes the P2422H as a 23.8-inch monitor measuring 53.78 cm wide and 17.957 cm deep with its stand.6 Work the panel backwards from the diagonal at 16:9 and you get 52.7 cm across, so bezel and chassis cost about 1.1 cm. The diagonal got you close on width.
Now try to get the depth from that diagonal. Nothing in the number 23.8 tells you the object is 17.957 cm deep with its stand, and nothing in it would have told you if it were 24 cm deep instead. The diagonal describes the panel; the stand is a separate object bolted underneath it, and whatever depth it turns out to need lands entirely on the depth axis.
Width is roughly derivable from a diagonal. Depth is not derivable from it at all.
That is also why a single “minimum desk width” figure cannot be written down here. A desk-width rule derived from a diagonal inherits the diagonal’s silence about the chassis, the stand and the laptop, so it is not a measurement of anything. The only figure this page will give you is the one your own four numbers produce.
There is a third footprint a desk-width rule omits: the laptop. Apple publishes the 14-inch MacBook Pro at 31.26 cm wide and 22.12 cm deep.8 Those are the closed chassis dimensions. The plan-view footprint of an open machine is that closed depth plus however far the lid leans back at the angle you work at — a second term that no specification can supply, because it depends on a choice you make. This page therefore never treats a published chassis depth as an open footprint, and neither should you.
- 1Surface — everything with weight resting on the top: stand bases, clamp bodies, the laptop, the keyboard and mouse.
- 2Display — everything occupying space without touching the desk: the angled chassis, its overhang, wall clearance, arm swing.
- 3Working position — eye-to-screen distance, which screen sits ahead of you, the input lane, and what can still be adjusted.
The instrument
The Three-Envelope Desk-Fit Planner
Enter what you measured. The planner judges the three envelopes separately, names the exact measurement that fails, and returns Not proven rather than guessing when something is missing.
It detects nothing and cannot see your room. Every figure is one you supplied or one calculated from it, and each output is labelled. ScreenExtendersHub did not assemble, measure or bench-test a physical dual-monitor desk for this edition. The page combines primary workplace guidance, official manufacturer dimensions, transparent geometry, and your own measurements.
The Three-Envelope Desk-Fit Planner
Measure once, enter the numbers, and the three envelopes plus mount compatibility are judged separately. The plan view below is drawn from the same figures that produce the verdict, so the drawing and the answer cannot disagree.
This runs entirely in your browser. Nothing you type is transmitted, stored, logged or remembered. There is no network request, no cookie and no local storage. Close or refresh the page and every figure is gone.
Fix these entries before the check can run
The planner could not start
Something prevented the script from running or from completing, so the interactive planner has been hidden rather than left on screen as dead controls. The same work is done on paper in section 03, and the printable record in section 10 carries every field the planner would have asked for. The three formulas are in section 06, and the mount checks are in section 07.
Envelope one
Measure the desk that is actually usable
A desk’s published size is a manufacturing figure. The number that matters is what is left after everything you cannot build on.
Total width is not usable width
Measure the top, then subtract each zone you will not put a screen on: the lamp base, the printer, the radiator cover, the section that disappears into a wall return. What remains is your real width.
Total depth is not usable depth either
Depth loses space at both ends: at the back to the cable run, the clamp bite and any lip that stops a stand sitting flush; at the front to the lane your hands work in. OSHA requires the surface depth to allow at least 20 inches of viewing distance with the screen directly in front of you.12
What a cramped surface actually causes
OSHA is explicit that limited work-surface space leads people to put components in undesirable positions — reaching for a mouse, or looking at a monitor pushed to the side.2 That is the real failure mode of a small desk.
Corners are deeper than they look
OSHA notes that a corner rather than a straight run can provide additional space and depth, and lists pulling the desk away from the wall as a way to make room behind the screens.1 A corner can convert a depth failure into a pass — but measure the usable rectangle inside it, not the diagonal reach: the deepest point is a single spot, not a band.
Cut rectangles to the footprints you recorded, lay them on the desk, and sit at it. That catches what arithmetic does not: the drawer that will not open, the window catch behind the left screen, the lid that rises into a shelf.
Write the eleven figures down before you open a product page: total width and depth, the left, right and rear zones, the front clearance you need, the wall setback, the desk thickness at the rear edge, any grommet, and the two subtractions that give you usable width and usable depth. They all appear on the printable record in section 10.
The hardware
Measure the hardware, not the product name
“A 27-inch monitor” is not a measurement. It is a category. The desk needs four numbers per screen, and only one of them is on the box.
The four numbers per screen
- Chassis width. The outer width of the object, not the panel.
- Chassis height. Portrait makes the height the width.
- Chassis thickness. Front to back at the deepest point — the term that decides what an angled screen costs in depth.
- Support footprint. The rectangle the stand or mount body actually occupies on your desktop. Where a specification gives only an overall depth with the stand, as Dell’s does for the P2422H, the footprint itself is not in the document and has to be measured.
Where the specification hierarchy runs out
Use the manufacturer’s specification for the exact model first, its manual second, and a retailer never. Be ready for the hierarchy to run out. Dell publishes the P2422H’s dimensions with the stand and its weight without it, but not its depth without the stand.6 If you are planning an arm, the number you need is the one that is not there.
When a dimension is not published
Measure the object, or ask the manufacturer in writing and keep the reply. Do not substitute a figure from a comparison site or another model in the same family. If the number is unobtainable, the honest verdict is Not proven.
The laptop number the specification does not contain
Apple publishes the 14-inch MacBook Pro as 31.26 by 22.12 by 1.55 cm.8 Those are the closed chassis dimensions, and Apple describes them as such. The open plan-view depth is that chassis depth plus the lid’s rearward projection, which varies with the angle you choose and is therefore yours to measure. The planner asks for the two terms separately and adds them, so the published figure is never quietly used as though it described an open machine.
If an arm is on the table, two documents come first
Before an arm is a plan rather than a hope you need the monitor’s VESA pattern and its weight without the stand, both in writing. Dell publishes 100 × 100 mm and 7.4 lb (3.37 kg).6 Section 07 covers what those are checked against.
Layouts
Four layouts and what each one spends
The same three objects spend your desk very differently depending on how you arrange them. There is no best layout — there is the one whose bill your desk can pay.
| Layout | Spends width on | Spends depth on | Suits | Fails when | Decided by |
|---|---|---|---|---|---|
| A — Pair behind, laptop in front | Two chassis plus one gap. | Support band, the open laptop, then your hands. | Narrow desks; laptop as a reference screen. | The desk is shallow — three depths stack in one lane. | Usable depth. |
| B — Pair centred, laptop aside | Two chassis, the laptop, and two gaps. | The deeper of the band or the laptop, then your hands. | Deep desks where the two externals do the work. | The row of three exceeds usable width. | Usable width. |
| C — Laptop raised at centre | Two chassis, the laptop, and two gaps — the same display row as B and D. | The support band, plus the riser footprint, which replaces the laptop’s. | Three-screen continuity with equal use. | The riser footprint or its height defeats it. | Usable width, then screen height. |
| D — Primary centred, two flanks | Two chassis, the laptop, and two gaps. | The support band, then your hands. | One external doing most of the work. | Width runs out, or the flanks sit too far off-axis. | Usable width, then viewing angle. |
Scroll the table sideways on a narrow screen.
The precise statement is this: B, C and D share the same theoretical display-row width, because each puts the same three chassis and the same two gaps in one row. Their actual surface requirement can still differ, because the support footprints differ — and layout C in particular replaces the laptop’s own footprint with a riser, which has its own width and depth and brings a screen-height question with it. Choosing between them is therefore a decision about support and about which screen deserves to be in front of you, answered in section 08 from published guidance rather than taste.
The geometry
Why angling a monitor trades width for depth
Angling the screens inward changes both axes at once, and below a calculable angle it returns no width at all.
What a rotated chassis actually occupies
A monitor is a rectangle seen from above: width w, thickness t. Turn it inward by θ and the axis-aligned box it occupies changes on both axes at once.
projected depth = w × sin θ + t × cos θ
The depth term bites. At θ = 0 the projected depth is just the thickness; rotate slightly and the screen’s width pours into the depth axis, because w is roughly ten times t.
The break-even angle
Here is the part that gets missed. Differentiate the span at θ = 0 and you get +t, a positive number. The span does not start falling when you angle a screen — it starts rising, and returns to the flat width only at:
For a chassis 53.78 cm wide and 5.4 cm thick that is 11.5°. Angle it by 10° and you have saved nothing on width — you are fractionally wider — while adding about 9.3 cm of depth. The planner calculates this for your own chassis and flags an angle below it.
The honest size of the effect matters. Below break-even the extra width is only a few millimetres, so this is not a warning that angling will burst your desk sideways. It is a warning that a modest inward angle is a pure cost: real depth spent, no width returned. To get width back you must commit past break-even, and by then the depth bill is substantial.
One assumption is stated rather than hidden: the planner uses your stand base as entered and does not rotate it with the screen. Base shapes differ too much — round, D-shaped, flat plate, twin feet — for a rotation to be anything but invented precision.
Save this distinction
The display envelope and the surface envelope move independently. Angling changes the first and barely touches the second. An arm changes the second and does nothing to the first.
Mounting
What monitor arms reclaim and what they do not
An arm buys back desktop. It does not make a screen smaller, and it introduces four new documents you have to satisfy before it is a plan.
What is genuinely reclaimed
The depth the monitor and its stand occupy together — 17.957 cm on the documented example6 — replaced by a clamp body of a few centimetres at the back of the desk. In section 09 that is the difference between a depth failure and a pass. What you have not done is reduce the display envelope by a millimetre.
The four documents an arm demands
| Check | What it means | Worked example |
|---|---|---|
| VESA pattern | The pattern on the monitor’s back must be one the arm accepts. | Dell publishes 100 × 100 mm for the P2422H.6 Ergotron’s LX dimensional drawing shows both 75 and 100 mm patterns.7 |
| Weight, both ends of the range | Gas-spring arms have a minimum as well as a maximum. | Ergotron documents 7–25 lb (3.2–11.3 kg) per monitor for the LX.7 Dell’s 7.4 lb without the stand sits inside that — by four tenths of a pound at the bottom.6 |
| Desk thickness | The clamp has to close on your actual rear edge. | Ergotron documents a desk clamp for edges under 2.4 in (60 mm), and a grommet mount with its own separate range.7 |
| Chassis thickness | A deep monitor loads the arm harder. | Ergotron states that a monitor depth greater than 2.5 in (64 mm) may diminish capacity.7 The same thickness figure you needed for the angle calculation is needed again here. |
Scroll the table sideways on a narrow screen.
What an arm can quietly make worse
An arm can push the screen forward into the space you were using, or backward into a wall you did not measure: Ergotron publishes the LX extending to 25.6 in.7 Three more, in the order they catch people:
- Wall collision. The arm needs room behind the desk to fold. If the desk is against a wall, the setback is a hard limit and the planner treats a rear-clearance requirement larger than your setback as a failure, not a caution.
- Articulation sweep. The screen has to be able to move through its range without hitting the other screen, the lamp or the window. Swing it before you commit.
- Cable slack. Every position the arm reaches needs cable and a service loop. A cable exactly long enough at one extreme unplugs itself at the other.
A wall mount changes the sum again
Taking the screen off the desk removes its surface footprint entirely, which is why the planner offers it with a zero footprint. It also fixes the viewing distance to wherever the wall is, removes most adjustability, and moves the question into wall construction — outside what this page can verify.
Envelope three
Place the screens around the work
Fitting is arithmetic. Being able to work at it is a separate question, and the published guidance answers it more precisely than a desk-width rule can.
Which screen goes in front of you
CCOHS gives a decisive rule that turns on one question: how much do you use each screen? Equally — monitors in front of you, edges touching, angled into a semicircle. Unequally — the busier one directly in front as though it were your only monitor, the secondary to one side at an angle.3
That is the rule that separates layouts B, C and D, which cost identical width. It is also why the planner asks how the laptop screen is used rather than assuming.
Viewing distance is a range, not a desk-size guarantee
OSHA gives a preferred viewing distance of 20 to 40 inches (50 to 100 cm), eye to screen surface.1 CCOHS notes that guidance on this differs significantly between sources and is a starting point rather than a fixed rule, offering an arm’s length as a practical estimate.3 HSE says the same: top of the screen level with your eyes, about an arm’s length away.4
The width-and-depth coupling nobody mentions
CCOHS advises that with a wide monitor you should consider how much its size makes you rotate your neck, and that it may be necessary to move it further away.3 Further away means more depth. Going wider does not only spend width — it can raise the depth requirement at the same time.
A bigger screen on a small desk can fail the depth test precisely because it passed the width one.
Height, angle and the open laptop
OSHA places the top of the monitor at or slightly below eye level, its centre 15 to 20 degrees below horizontal, and monitors no further than 35 degrees left or right.1 That last figure constrains wide arrangements: three objects in a row on a shallow desk push the outer screens further off-axis than on a deep one, because you sit closer.
For the laptop, HSE’s guidance for prolonged use is direct: a separate keyboard and mouse so the screen can be raised on a riser, with screen and keyboard central so you are not twisting.4 That is the case for layout C, and it is why layout C brings a riser footprint and a screen-height check that the other layouts do not.
Individual needs come first
CCOHS notes that people using bifocals, trifocals or progressive lenses may prefer the top of the monitor slightly below eye level, and that a portrait screen should not put its top above eye level.3 HSE requires employers to assess the whole workstation and the individual’s needs, and to reassess when it changes.5 This page is a geometry instrument, not an assessment, not medical advice, and it certifies nothing.
Case files
Three documented desk-fit case files
Three worked files on one desk: 120 cm wide, 60 cm deep, 6 cm reserved at the back for cables, 3 cm of gap between objects, and 15 cm of front working clearance. Usable width 120 cm; usable depth 54 cm.
These are measurement examples, not recommendations. No product here is endorsed, ranked or reviewed, and no unit was obtained or tested. They appear because their makers publish the dimensions needed to show the arithmetic. Commercial arrangements are set out in the disclosure policy; nothing in this section is an affiliate recommendation.
File one — two monitors on supplied stands, laptop in front
Two Dell P2422H displays, 53.78 cm wide by 17.957 cm deep with the stand Official.6 An Apple 14-inch MacBook Pro, 31.26 cm wide with a closed chassis depth of 22.12 cm Official.8 Layout A. Two further figures are stated working values rather than published ones and are labelled at every appearance: chassis thickness 5.4 cm, and a lid rearward projection of 7.0 cm measured at a working opening angle Hypothetical.
| Line | Figure | Label |
|---|---|---|
| Pair span, flat | 53.78 + 3 + 53.78 = 110.56 cm | Calculated |
| Width margin | 120 − 110.56 = +9.44 cm | Passes |
| Overall depth with stand | 17.957 cm | Official Dell |
| Laptop closed chassis depth | 22.12 cm | Official Apple |
| Lid rearward projection | 7.00 cm | Hypothetical, user-measured |
| Laptop open plan depth | 22.12 + 7.00 = 29.12 cm | Calculated |
| Band plus the open laptop | 17.957 + 29.12 = 47.08 cm | Calculated |
| Left for your hands | 54 − 47.08 = 6.92 cm | Calculated |
| Against 15 cm required | short by 8.08 cm | Does not fit as drawn |
Width passes with nearly ten centimetres in hand and the arrangement fails anyway, on depth, by more than eight — the dimension the diagonal never mentioned. Notice how much of that shortfall is the lid term. Had the closed chassis figure been carried straight into the depth stack, the same desk would have looked about a centimetre short rather than eight, which is the difference between a setup you squeeze into and one that was never going to work.
File two — the same pair, moved to documented arms
Same displays, same laptop, same desk. The stands come off and the screens go onto clamp arms whose published dimensional drawing gives a clamp body of roughly 7.9 cm measured across the rear edge by 9.1 cm front to back.7
- Depth at the back of the desk: 17.957 cm becomes about 9.14 cm. Depth consumed by that band and the open laptop falls from 47.08 cm to about 38.26 cm.
- Left for your hands: about 15.74 cm against the 15 cm required — a margin of roughly seven millimetres. The depth envelope passes, but only just. That is what the arithmetic gives once the lid is counted, and a margin that thin is itself the finding.
- Display envelope: unchanged. The pair still spans 110.56 cm. The arm reclaimed surface, not screen.
The arithmetic passes. The arrangement does not yet have a verdict, and the honest one is Not proven — not Conditional fit — because essential mount and desk evidence is absent. Documented: VESA, where Dell publishes 100 × 100 mm and the LX drawing shows 75 and 100 mm;67 and weight, where 7.4 lb without the stand sits inside a documented 7–25 lb range, near its bottom.67 Not recorded: the desk’s actual edge thickness against the clamp’s documented range;7 the rear swing clearance behind the desk; the arm’s documented maximum usable reach; and the reach this layout actually requires from the mount pivot. Four missing items, and under the precedence this page uses, missing evidence outranks a passing calculation.
File three — one screen turned portrait, laptop to one side
Monitor one stays landscape at 53.78 cm. Monitor two turns portrait, so its chassis height becomes its width — taken as 33.0 cm, a stated hypothetical figure.6 Layout B.
- Portrait saved: 53.78 − 33.0 = 20.78 cm on that screen. A real, large saving.
- The layout spent: moving the laptop into the row adds its 31.26 cm plus a 3 cm gap = 34.26 cm.
- Row total: 53.78 + 3 + 33.0 + 3 + 31.26 = 124.04 cm against 120 cm usable — short by 4.04 cm.
The record
The pre-purchase desk-fit record
One sheet, filled in before you buy. The planner produces this automatically and it can be copied or printed; here it is on paper for anyone who wants to work it by hand.
- Date of measurement
- Desk: total width × depth
- Desk: usable width × depth
- Monitor 1 model and exact identifier
- Monitor 1 chassis W × H × T
- Monitor 1 support footprint
- Monitor 2 model and exact identifier
- Monitor 2 chassis W × H × T
- Monitor 2 support footprint
- VESA pattern documented (each screen)
- Weight without stand, against arm capacity
- Laptop open footprint W × D
- Layout chosen (A / B / C / D)
- Width required / margin
- Depth required / margin
- Eye-to-primary-screen distance
- Unresolved evidence
- Verdict
- Source URLs for every published figure
Ports, power, display ceilings and operating-system limits have to clear as well. The pre-purchase compatibility audit is the whole-purchase version of this record.
Recovery
Redesign in the correct order
When the check fails, try these changes in this order. The list runs from free and reversible to expensive and permanent.
- Measure the reserved zones rather than estimating them. They are the cheapest centimetres on the desk.
- Move the laptop without hiding it. Moving it beside the pair converts a depth problem into a width problem, which you may have room for.
- Change the angle in the right direction. Below break-even, flattening the screens costs no width and returns real depth.
- Replace the stands with documented compatible arms. The largest depth recovery available, as file two shows — though file two also ends Not proven until the mount evidence, including arm reach, is in writing.
- Turn one display portrait, if the work allows it. Large width saving, real workflow consequences.
- Move equipment off the desk. A dock, hub, speakers or riser may go under it, behind it or on a wall.
- Reduce monitor chassis size. Cheaper than a desk, and the only change that shrinks both envelopes at once.
- Change the desk. Consider a corner before a wider rectangle — OSHA notes corners add depth, and depth is what fails in the worked 120 × 60 cm case.1
- Close the laptop — last, and only with evidence. It removes a footprint but changes what your machine will drive. Confirm that first with the 5-gate display support check.
Routing
Failure signatures and the correct next page
This page answers one question: will it physically fit and can you work at it. If your symptom is on this list, the answer is on a different page.
| What you are seeing | What it actually is | Where it is answered |
|---|---|---|
| Everything fits, but the second monitor never appears | A display-capability question. | How many monitors can my laptop support? |
| Both monitors show the same image | Mirroring rather than extending. | Why are my dual monitors showing the same thing? |
| The laptop drives fewer screens than you planned | A display ceiling in the graphics pipeline. | The 5-gate display support check |
| You are planning a third screen | Bandwidth and power, before geometry. | Triple monitor setup: three budgets to verify |
| Portrait saves the width but breaks the application | A workflow question. | Vertical monitor setup: the workflow fit lab |
| One USB-C port is supposed to carry both screens | Port and protocol capability. | Can you run 2 monitors off one USB-C port? |
| The dock will not detect the second monitor | Dock architecture and routing. | Docking station not detecting a second monitor |
| The whole purchase still needs checking | Everything at once. | The pre-purchase compatibility audit |
Scroll the table sideways on a narrow screen.
Questions
Questions about small-desk dual monitor setups
Ten questions this page can answer, without inventing a universal rule where the evidence does not support one.
What size desk do I need for two monitors and a laptop?
There is no honest universal answer. The desk has to hold the outer width of both chassis, the laptop and your gaps, and be deep enough for the support footprint, the open laptop, your input devices and your hands. Two documented 24-inch monitors span 110.56 cm with a 3 cm gap.6 Yours are not those monitors.
Can two 27-inch monitors fit on a 48-inch desk?
Only your two specific monitors can answer that. A 48-inch desk is about 122 cm. If your two chassis measure 61 cm each, the pair plus a 3 cm gap is 125 cm and the width alone already fails, with no room for a laptop in the row. Measure the chassis rather than reading the diagonal, then check depth separately.
Do monitor arms save desk space?
They save surface, not screen. Replacing the 17.957 cm a monitor and its stand occupy with a clamp at the rear edge is a real recovery of depth,6 but the display spans exactly what it spanned before. An arm also brings four documentary requirements: VESA pattern, weight range, desk thickness and chassis depth.7
Is a 24-inch-deep desk enough for two monitors?
Twenty-four inches is about 61 cm, and depth is spent in a stack: rear zone, support footprint, anything in front of the screens, then your hands. A monitor 17.957 cm deep with its stand6 plus a laptop whose closed chassis alone is 22.12 cm8 consumes most of it before your wrists arrive — and the open lid adds more on top of that closed figure. Moving to arms, or moving the laptop out of that lane, changes the sum. Run your own numbers rather than trusting a depth rating.
Should both monitors be centred?
It depends on how you use them, and CCOHS is specific. Used equally: in front of you with the edges touching, angled into a semicircle. Used unequally: the busier one directly in front as though it were your only monitor, the second to one side at an angle.3
Where should the open laptop go?
Wherever its screen deserves to be, given how much you use it. As a reference screen, in front of or beside the pair is fine. As a genuine third display, HSE’s guidance for prolonged use points towards a separate keyboard and mouse with the laptop screen raised on a riser4 — which is layout C. Its display row is no wider than B or D; what it adds is a riser footprint and a screen-height check.
Does turning one monitor vertically save desk width?
Yes: the chassis height becomes the width. In the worked example that removes about 20.8 cm from one screen, the largest single saving in that case. Whether it suits the work is a separate question, answered in the vertical monitor workflow fit lab. CCOHS also notes a portrait screen must not put its top above eye level.3
Can monitors safely overhang the desk?
The display can overhang; the support cannot. A stand base needs its whole footprint on the surface, and a clamp needs a continuous edge of a documented thickness.7 Treat overhang as a last resort, not a plan.
What if the manufacturer lists only the diagonal?
Then you do not have a fit yet. The planner returns Not proven and shows a 16:9 panel estimate purely as an illustration — it excludes bezel, chassis and support, and is always an underestimate. Ask the manufacturer in writing, or measure the object. Do not borrow a figure from another model in the same family.
Should I close the laptop to save space?
Spatially it works, because it removes a whole footprint. But it changes what your machine will drive, and that varies by machine and operating system rather than following a rule. Confirm the display outcome first with the 5-gate display support check. This page’s promise is two screens and an open laptop; closing it is a different setup.
Evidence
Evidence, method and limitations
Research basis
Built from primary workplace-ergonomics publications and manufacturers’ own specifications, all opened and read. Eleven sources are cited and every one supports a visible claim. No figure was taken from a retailer, a comparison site or a competitor page.
No hardware was tested
ScreenExtendersHub did not assemble, measure or bench-test a physical dual-monitor desk for this edition. The page combines primary workplace guidance, official manufacturer dimensions, transparent geometry and measurements supplied by the reader. The products named in section 09 are measurement examples chosen because their makers publish the dimensions needed to show the arithmetic. They are not recommendations, they were not obtained, and no claim is made about their quality.
Calculation method
Three formulas govern every geometric figure, applied identically by the prose, the diagrams and the planner:
- Projected span = w × cos θ + t × sin θ
- Projected depth = w × sin θ + t × cos θ
- Break-even angle = 2 × arctan (t ÷ w)
Angles are converted to radians before evaluation. Panel estimates from a diagonal assume 16:9 and exclude bezel, chassis and support. Stand bases are used as entered and are not rotated with the screen, because base shapes vary too much for a rotation to be anything but invented precision.
What the planner cannot verify
- It cannot see your desk, room, body or hardware. A wrong input produces a confident wrong answer.
- It cannot confirm that a desk will carry a clamp load or a wall a mount, and it applies no threshold to the working centreline because none is published here.
- It cannot assess a workstation, diagnose anything, or certify a setup as safe.5
- It models rectangles. Curved panels, unusual bases, corner desks and sit-stand travel need their own measurement.
- It says nothing about whether your computer can drive the displays.
Known limitations
Three figures in the worked examples are stated working values, not published specifications, and each is labelled at every appearance: chassis thickness 5.4 cm, the portrait chassis width in file three 33.0 cm, and the lid rearward projection 7.0 cm. The cited Apple specification gives closed chassis dimensions; it does not give the plan-view footprint at a chosen opening angle, so that projection has to be measured for the intended working position. The conclusions in files one and two depend on it, which is why it is labelled and why the planner asks for your own.
Deployment note
Where this article is shared as a Pinterest Article Rich Pin, the headline, description and author shown on the Pin are read from this page’s own Open Graph or schema.org markup rather than typed into Pinterest; og:type, og:title and og:description are the required fields.9 On this site those fields are generated by Yoast, which is the single source of structured data for the page. Nothing in this article fragment emits them.
Update triggers
- OSHA, CCOHS or HSE revising the guidance cited here.
- A cited specification changing, or a cited model being replaced.
- An arithmetic error, reported under the corrections and updates policy.11
- Any change to the methodology.10
Source ledger
All eleven addresses were checked, and every one of the eleven documents was opened and read in this build. No entry rests on a search-result summary.
- OSHA — Occupational Safety and Health Administration — Computer Workstations eTool: Workstation Components — Monitorshttps://www.osha.gov/etools/computer-workstations/components/monitors
- OSHA — Occupational Safety and Health Administration — Computer Workstations eTool: Workstation Components — Deskshttps://www.osha.gov/etools/computer-workstations/components/desks
- CCOHS — Canadian Centre for Occupational Health and Safety — Office Ergonomics — Positioning the Monitorhttps://www.ccohs.ca/oshanswers/ergonomics/office/monitor_positioning.html
- HSE — Health and Safety Executive (UK) — Working safely with display screen equipment: Good posturehttps://www.hse.gov.uk/msd/dse/good-posture.htm
- HSE — Health and Safety Executive (UK) — Working safely with display screen equipment: Workstations and assessmenthttps://www.hse.gov.uk/msd/dse/assessment.htm
- Dell Technologies — Dell 24 Monitor — P2422H, published technical specificationshttps://www.dell.com/en-us/shop/dell-24-monitor-p2422h/apd/210-bbcc/monitors-monitor-accessories
- Ergotron — LX Desk Mount LCD Arm — Dimensional Illustrations (DIM2-056)https://media.ergotron.com/reserved/resources/dim2-056-orig.pdf
- Apple — MacBook Pro (14-inch, M4 Pro or M4 Max, 2024) — Technical Specificationshttps://support.apple.com/en-us/121553
- Pinterest Developers — Article Rich Pins — supported Open Graph and schema.org propertieshttps://developers.pinterest.com/docs/web-features/article-rich-pins/
- ScreenExtendersHub — Methodologyhttps://screenextendershub.com/methodology/
- ScreenExtendersHub — Corrections & Updates Policyhttps://screenextendershub.com/corrections-updates-policy/
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Desk fit is one gate. These four cover the gates this page deliberately does not.
For hardware context rather than geometry: the desktop screen extenders hub, the portable monitors hub, and the docking stations hub.
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