Monitor Size and Distance Calculator for Sim Racing

Screen size is the wrong question. The number that decides how a sim racing display feels is how much of your vision the screen fills, and that depends on width divided by distance, not on the diagonal printed on the box. A 27 inch panel at 24 inches and a 40 inch panel at 36 inches produce almost exactly the same field of view. This calculator converts a diagonal, an aspect ratio and a seating distance into the real horizontal angle the screen covers, tells you the in-game FOV that matches it, and says plainly whether the setup is too narrow to be worth building around.

Monitor size and distance calculator

Enter the panel diagonal in inches, pick the aspect ratio, and measure the distance from your eyes to the centre of the screen when you are in your normal driving position. Not from the wheel, and not from the front of the desk. From your eyes.

How the field of view number is calculated

Three steps, all of them checkable with a tape measure and a calculator.

1. Panel width from the diagonal. For an aspect ratio of width to height r, the width is the diagonal times r divided by the square root of r squared plus one. For 16:9 that factor is 0.8716, so a 27 inch panel is 23.53 inches wide. For 21:9 it is 0.9191 and a 34 inch panel is 31.25 inches wide.
2. Half angle from width and distance. The angle from your eye to one edge is the arctangent of half the panel width divided by the viewing distance.
3. Double it. Horizontal field of view is twice that half angle. A 23.53 inch wide panel at 26 inches gives 2 times arctan of 11.77 divided by 26, which is 48.6 degrees.

For triples the calculator adds the two side panels at an assumed 55 degree inward angle, projecting each one onto the horizontal plane rather than simply adding three flat widths. That is why triples come out around 130 to 150 degrees rather than three times the single panel figure. For the panel angle itself, which depends on your distance rather than on taste, use the triple monitor FOV calculator.

What field of view do you actually want?

The correct answer is the one that matches reality. If you set the in-game horizontal FOV to the angle your screen genuinely subtends, then one degree of car rotation in the sim is one degree of image movement in your room, and every distance and speed cue reads correctly. Braking points become repeatable because the world is not being stretched or compressed on its way to your eye.

Most sims ship with a default FOV far wider than any monitor subtends, because a wide FOV shows more track and looks better in a screenshot. The cost is that everything appears further away and moving more slowly than it is, which is why a correctly set FOV feels alarmingly fast for about twenty minutes and then feels right forever.

Two things jump out of that table. First, a 24 inch panel at 36 inches gives 32.3 degrees, which is roughly a third of what triples give and is the single most common reason a rig feels flat and slow. Second, the megapixel column is the hidden cost: triple 1440p is 11.06 megapixels per frame against 3.69 for one panel, a threefold increase in what the graphics card has to render every single frame. Budget the panels and the card together, which is what the PC spec calculator is for.

Is a bigger screen further away the same thing?

In pure geometry, yes. Field of view is a ratio, so doubling both the width and the distance leaves the angle unchanged. A 43 inch television at 40 inches and a 27 inch monitor at 25 inches subtend almost the same angle, and both will read the same in this calculator.

In practice three things separate them. Pixel density falls as the panel grows: a 43 inch 4K panel and a 27 inch 1440p panel have similar pixels per inch, but a 43 inch 1440p panel does not, and distant apex markers turn into mush. Response time on televisions is usually worse than on a gaming monitor, and a fast pan through a corner is exactly the motion that exposes it. And room depth costs money too: sitting 40 inches back adds more than a foot to the rig footprint, which the rig space calculator will show you against your actual room.

The practical conclusion is that a 27 inch 1440p panel at $169.99 close to your eyes beats a much larger television further away for almost every sim rig, and it costs less. If you want genuinely more field of view rather than a larger picture, the honest routes are an ultrawide at $248.00, triple panels, or VR.

When is a single panel no longer enough?

Around 60 to 65 degrees, which is where the edges of a flat panel start to sit outside the area you can take in without moving your eyes. You can sit closer than that, and the geometry keeps working, but the image begins to look distorted at the corners and the panel stops feeling like a window.

Past that point there are three honest options. An LG 34 inch ultrawide at $248.00 takes you to roughly 66 degrees at 24 inches with one cable and no bezel correction. Triple 27 inch panels plus a MOUNTUP triple monitor stand at $66.48 take you past 130 degrees and give genuine peripheral vision, at the cost of three times the pixels. A Meta Quest 3S at $349.99 gives around 100 degrees with real head tracking, which is a different kind of advantage entirely. The trade-offs are worked through in triples versus ultrawide and VR versus triple monitors.

What does not work is buying a bigger panel and pushing the seat back to fit it. That keeps the field of view exactly where it was, spends money, and costs room length. If the FOV number this calculator returns is under about 40 degrees, moving closer is free and will change more than any purchase.

For per-panel figures across every common size and distance, see the monitor size and FOV chart. For choosing panels rather than positioning them, the monitor roundup splits the category into three tiers, and how to set up triple monitors covers bezel correction and panel angle once you have decided.