What size monitor should I get?

Screen size is the wrong place to start. The number that decides whether a monitor feels right is how much of your vision it fills — and that depends just as much on how deep your desk is, and how far the stand pushes the panel forward, as it does on the diagonal printed on the box.

Ask ten people what size monitor to buy and you will get ten diagonals and no reasoning. The useful question is different: at the distance you will actually sit, how wide an angle does the screen cover, how sharp is the text at that angle, and can you sit far enough back to stop your eyes working hard all day. Get those three right and the diagonal falls out of the maths on its own — usually larger than people expect.

Work out your own size first

Set the tool below to your real desk, not an ideal one. Measure the depth from the front edge to the wall, decide how the monitor will be held up, and be honest about how far back you sit. Everything else is geometry.

The pattern almost everyone hits is the same. The screen is not too big — the desk is too shallow, and the stand is eating another 15 cm of it. A 32″ panel that feels overwhelming at 60 cm is comfortable at 85 cm, and nothing about the panel changed.

Buy the distance first. Then buy the screen that fills it.

Field of view is the real measurement

Horizontal field of view is the angle your screen subtends at your eye. It is the one number that captures size and distance together, and it is why two people with the same monitor can have completely different experiences of it.

A screen covering roughly 35–50° suits reading, writing and spreadsheets: your eyes sweep across it without your head moving much. Around 50–70° is where single-player games, simulators and video start to feel enveloping. Competitive players run anywhere from about 50° up to 90°, deliberately trading peripheral awareness against how far their eyes have to travel to check the edges of the screen.

Read that chart the other way round and it becomes a buying guide. If your eyes end up about 85 cm from the panel, a 40″ screen gives you the same view of the world that a 24.5″ gives someone hunched at 52 cm — with none of the close-focus cost. The large monitor is not more aggressive. It is the same picture, moved to a healthier distance.

The top of that range is a reality check as much as an option. A 65″ or 75″ panel wants 1.4 m or more of distance to stay comfortable, which is a living-room measurement rather than a desk one — sit closer and you are turning your head to read the corners. Above roughly 48″ you are buying a television-sized panel, so plan on a wall mount, a 4K or higher resolution, and a room deep enough to use it.

Why a bigger, sharper screen is easier on your eyes

Your eyes are not designed for sustained close focus. Holding focus at 50 cm means the ciliary muscle inside each eye stays contracted and both eyes stay converged inwards for hours at a time. That sustained near effort is the mechanism behind most of what people call digital eye strain: aching, dryness, headaches and text that swims after a long session. Moving the same content further away reduces the demand directly, because the further the object, the closer your eyes get to their relaxed resting state.

The catch is that moving a small screen further away makes everything on it too small to read, so people pull it back in. A large screen breaks that trade-off: it holds the same apparent text size at a much greater distance. That is the whole argument for size.

Resolution is what buys you the distance

Size alone is not enough — the pixels have to disappear at the distance you sit. The measure that matters is pixels per degree: how many pixels land in each degree of your field of view. Below roughly 40 pixels per degree you can pick out pixel edges on text and diagonal lines. Past about 60 the structure is effectively gone for most people, and past that you are paying for sharpness you cannot resolve.

This is why 1080p stops making sense above about 24″, and why a 1440p panel runs out of road somewhere around 32″. A 4K panel at 32″ to 43″, scaled up so the interface stays a sensible physical size, gives you large, comfortable text that is also genuinely crisp. The calculator above reports both figures, so you can see the point at which extra inches start costing you sharpness rather than gaining you view.

Where your eyes should meet the screen

The old advice — put the top edge of the screen at eye level — was written for 17″ and 19″ panels. Apply it to a 32″ or 42″ screen and everything you actually read ends up well below your eye line, so you spend the day with your chin dropped. That is a neck problem, not an eye problem, and it is the single most common mistake people make after upsizing.

The better rule scales with the panel. Your eye line should land above the centre of the screen but below the top edge — roughly 60–70% of the way up. Your natural gaze then falls just slightly below horizontal, which is where the eye muscles and the neck are both relaxed, and the top of the screen stays comfortably within view without you tipping your head back.

In practice that means the top edge of the panel sits a little above your eyes, not level with them, and the further up the size range you go, the higher above it sits. On a 27″ screen the top edge wants to be around 12 cm above your eye line; on a 32″ about 14 cm; on a 40″ to 42″ closer to 18 cm. The centre of the screen ends up only 5–8 cm below your eyes rather than 20 cm below.

Most stands cannot go low enough for a large panel on a standard-height desk, which is the second reason to consider a monitor arm or a wall mount. Beyond recovering the 10–20 cm of depth the stand steals, an arm lets you drop the panel almost to the desk surface and tilt it back a few degrees so the whole screen faces your eyes squarely.

Panel technology: what actually matters at these sizes

Once you have settled on a size, the panel type decides how the screen behaves in your room — how it handles the window behind you, whether colours hold up when you glance at it from the side, and whether you need to think about burn-in at all.

Choosing between them

• Mixed work and gaming in a normal room: a matte WOLED. You get the contrast and response of OLED without fighting reflections, and the burn-in mitigations cope with ordinary desktop use.
• All-day static interfaces: mini-LED or IPS. If the screen shows the same dashboard, till system or CAD toolbar for eight hours, take burn-in off the table entirely.
• Colour-critical work: a factory-calibrated IPS, or QD-OLED if the room light is controlled. Check the panel ships with a calibration report rather than trusting a marketing figure.
• A bright or window-facing office: matte mini-LED. Brightness and an anti-glare finish beat contrast you will never see through the glare.

Ultrawide or a normal screen?

An ultrawide is not a bigger monitor. It is a wider one, and that distinction catches people out. A 34″ 21:9 panel is almost exactly the same height as a 27″ 16:9 — about 33 cm of usable screen in both cases. A 49″ 32:9 is still only as tall as that 27″. All the extra diagonal has gone sideways.

That matters because documents, code, web pages and email are tall, not wide. If your complaint is that you cannot see enough of a spreadsheet or a page at once, a wider screen does not fix it — a taller one does, which means a larger 16:9 panel. If your complaint is that you are forever tiling two windows side by side and the bezel lands in the middle of your work, the ultrawide is exactly the right answer.

Widths and heights above are calculated from the diagonal and aspect ratio. Equivalences compare the active panel area, not the resolution or the price.

What you gain and what you give up

• No bezel where you look. The strongest argument for an ultrawide is that a two-screen layout normally puts a join straight down the centre of your attention. One panel removes it.
• One cable, one input, one calibration. A single panel means one colour profile, one set of controls, one KVM path, and no hunting for which screen a dialogue box opened on.
• Software still has opinions. Some applications and a fair number of games do not handle 21:9 or 32:9 properly — you get stretched images, a letterboxed centre panel, or menus pinned to one edge. Video is almost always letterboxed unless it is genuinely cinematic.
• You will need window management. A wide desktop without snapping zones becomes a mess of half-tiled windows. Budget for FancyZones, a window manager, or the maker’s own tiling utility as part of the setup.

Two screens, three screens, or one big one

Multi-monitor arrays solve a different problem from a single large panel. They give you hard separation — a full-screen application on each, with no window management at all — and they let you replace or add one screen at a time. What they cost you is continuity: bezels, mismatched colour and brightness between panels, heights that never quite line up, and edges that sit too far off-axis to read without turning your head.

Three 27″ screens side by side span about 180 cm. At a realistic 85 cm viewing distance that is around 93° of field of view, so the outer panels are well outside the zone your eyes can scan comfortably. They work, but only as reference space you glance at rather than read from, and only if you angle them inwards — which in turn needs more desk depth at the corners than most desks have.

The super-ultrawides

The 49″ and 57″ 32:9 panels exist to replace a dual-monitor rig with one sheet of glass. A 57″ 32:9 at 7680×2160 really is two 32″ 4K screens fused together, with the same pixel density and the seam removed — and that is a genuinely different experience from any dual setup.

The geometry, though, is uncompromising. That panel is 139 cm wide. To cover a comfortable 55° you would have to sit over 130 cm away, which no normal desk allows. In practice you sit at 80–100 cm and accept a very large field of view, using the outer thirds as peripheral space rather than reading from them.

This is what the aggressive curves are for. A 1000R panel is curved to a one-metre radius, so seated at roughly a metre every part of the screen is about the same distance from your eyes and faces you squarely — which on a panel this wide is the difference between usable and absurd. Gentler curves such as 1800R suit flatter, wider seating positions. Treat the curve figure as the intended viewing distance in millimetres, and sit near it.

The numbers make the case better than the marketing does. On a flat 49″ 32:9 at 90 cm, the far edges of the panel are about 20% further from your eyes than the centre, and angled away from you as well — which shows up as softer focus and shifted colour at the sides. Curve the same panel to 1000R and that difference falls to almost nothing, because you are sitting at the centre of the circle the screen is bent around. The curve also wraps the edges slightly towards you, so a curved panel covers a few degrees more than a flat one of the same size at the same distance.

On a 27″ or 32″ 16:9 panel, none of that really applies: the edges are only around 9% further away flat, and curving them recovers perhaps four percentage points. At that size the curve is a preference, not a fix — and it is a genuine drawback if you do precision drawing, CAD or layout work where you need straight lines to look straight. Set the curve control in the calculator above and watch the evenness check: it barely moves on a 16:9 panel and moves a long way on a 32:9 one, which is the whole story.

Desks, stands and mounts

Almost every sizing decision eventually runs into furniture. Standard office desks are commonly 60 to 80 cm deep, and sit-stand frames often sit at the shallow end of that range. Take a stand’s 10–20 cm setback off a 60 cm desk and you are trying to work at around 50 cm from the panel, which is the position the whole of this article is written to avoid.

1. Measure before you choose

   Desk depth front edge to wall, desk width, and where your eyes sit relative to the front edge. Put those into the calculator at the top of the page and let it tell you the size.

2. Recover the setback

   A clamp-on arm or a wall mount pushes the panel to the very back and typically returns 10–20 cm of viewing distance — often the single cheapest way to move up a screen size comfortably.

3. Check the load, not just the VESA pattern

   Large panels can exceed 10 kg. Match the arm’s stated weight range, check your desktop thickness against the clamp, and use a grommet mount or a back plate on thin or hollow tops.

4. Set the height last

   With the panel back and the distance right, drop it until your eye line meets the screen around two thirds of the way up, and tilt it back a few degrees so it faces you squarely.

The screen that feels right is the one that fits the room, not the one that fits the budget line.

For most people doing mixed office and home use, that lands on a 32″ to 42″ 4K panel on an arm, set back against the wall, scaled to 125–150%, with the eye line two thirds of the way up. It is a bigger screen than most would buy unprompted, and it is almost always more comfortable than the 27″ sitting 55 cm away that it replaces.