How do I calculate FOV for a multi-monitor flight simulator?

For a general PC flight simulator, calculate each monitor’s horizontal field of view from the visible screen width and the perpendicular distance from your eyes to its screen plane: hFOV = 2 × atan(width ÷ (2 × distance)). Convert the result to degrees, then assign that FOV to each independent simulator view and aim it at the monitor’s physical centre.

How is flight simulator FOV calculated?

Use the physical screen geometry, not its resolution or advertised diagonal size.

• Screen width: Measure the illuminated panel from left to right, excluding the bezel.
• Viewing distance: Measure from your normal eye position to the screen plane, along a line perpendicular to the panel.
• Units: Use the same unit for both measurements; centimetres or inches produce the same result.

The complete degrees formula is hFOV = 2 × atan(width ÷ (2 × distance)) × 180 ÷ π. Many calculators return radians unless switched to degree mode.

For example, a visible width of 60 cm at an eye distance of 70 cm gives 2 × atan(60 ÷ 140) = 46.4°. That monitor should therefore display about 46.4 degrees horizontally.

If the simulator requests vertical FOV, convert it using the panel’s width-to-height aspect ratio: vFOV = 2 × atan(tan(hFOV ÷ 2) ÷ aspect ratio). A 46.4-degree horizontal view on a 16:9 panel is approximately 27.1 degrees vertically.

How do I calculate side-monitor FOV and camera angles?

Treat each monitor as a separate view whose virtual camera points towards that panel’s centre.

1. Fix the eye position. Adjust the seat first and mark its normal position; moving it later changes every calculated angle.
2. Aim each panel towards the eyes. Ideally, a line perpendicular to the centre of each screen should meet the eye position.
3. Calculate every panel separately. Identical screens at identical perpendicular distances use the same FOV. Recalculate panels with different sizes or distances.
4. Set the camera headings. The centre view uses 0 degrees. Each side view is rotated to the horizontal bearing of that monitor’s centre.
5. Correct for bezels last. Bezels create a small hidden angular region; they must not be counted as visible screen width.

With three identical, adjoining monitors that all face the eye point, a 46.4-degree per-screen FOV gives approximate camera headings of -46.4°, 0° and +46.4°. Gaps, thick bezels or unequal distances alter those offsets.

For irregular arrangements, measure the coordinates of each visible edge relative to the eye point. Its horizontal bearing is atan2(horizontal offset, forward distance). The difference between the two edge bearings is that monitor’s angular span, while their midpoint gives the view heading. A panel not aimed at the eyes technically requires an off-axis projection; if the simulator provides only a symmetrical view, turning the physical panel towards the eye point gives the closest match.

X-Plane users can follow our worked method for entering per-monitor geometry in X-Plane 12. For Microsoft Flight Simulator, the corresponding process is covered in our MSFS 2024 window, camera rotation and monitor-angle setup.

Which FOV value should I enter in the simulator?

Enter the calculated per-monitor angle only when the simulator exposes a true horizontal or vertical FOV control.

Independent render windows are preferable for angled displays because each receives its own projection and heading. A single ultra-wide desktop can work across flat, coplanar monitors, but it cannot correctly represent three differently angled screen planes without projection correction. Our guide to native simulator windows and GPU-spanned displays explains which arrangement to use.

Why do multi-monitor views look stretched or misaligned?

Most alignment failures come from using the wrong measurement or assigning one panoramic FOV to several angled monitors.

• Stretched side views: Replace the single wide viewport with independent views, or keep all screens physically flat.
• Too much scenery on every screen: You entered the total setup FOV into each window. Use the per-monitor angle instead.
• Objects change size at a join: Recheck visible panel width, viewing distance and horizontal-versus-vertical FOV.
• Duplicate or missing scenery near a bezel: Correct the side-view heading or bezel compensation rather than changing FOV.
• The horizon steps up or down: Match monitor height, vertical camera angle and roll. Horizontal FOV will not repair vertical misalignment.
• The calculation looks wildly wrong: Check whether the calculator returned radians and confirm that width and distance used the same unit.

Resolution and operating-system scaling do not change the physical FOV. They affect image detail and interface size, but the geometry still comes from panel dimensions and eye position.

How can I verify the FOV calibration?

A correctly calibrated setup keeps scenery scale and direction continuous as an object crosses from one monitor to the next.

1. Lock the viewpoint and disable head movement while testing.
2. Use the horizon to correct monitor height, view pitch and roll.
3. Place a distant vertical object near each join. If its size changes across the seam, correct FOV; if it is duplicated or disappears, correct camera heading.
4. Apply bezel compensation only after the projections align, then save the camera or display profile.

A mistake we see constantly is widening FOV simply to show more of the cockpit. That breaks the physical scale and makes the side screens look unnaturally distant. Keep the geometrically correct FOV, then adjust the virtual seat position or use a separate instrument view when more cockpit visibility is needed.