Which FOV do I use in ACC?

Assetto Corsa Competizione uses vertical FOV. Take the vertical value from the calculator.

How do I measure the bezel on triple screens?

Measure the black border of one screen plus the gap plus the black border of the other screen, in millimetres, for each join between two monitors.

FOV Calculator Triple Screen iRacing

Cockpit view on triple screens during a race — FOV and viewing angle in sim racing — Tool · Hardware
FOV calculator for triple screens & single monitor

Get the right FOV for your sim racing setup. Enter screen diagonal, viewing distance and, for triples, bezel + monitor angle. You get horizontal FOV for iRacing and vertical FOV for ACC — so your triples line up perfectly. No fuss.

Your setup

Screen diagonal (inches) One monitor, not the total triple width

Aspect ratio

Viewing distance to centre screen (cm) Eyes → centre of the middle screen, looking straight ahead

Bezel / gap per join (mm) Black border left + right between two screens (or measured gap)

Side monitor angle (°) 0° = flat side-by-side · 45–60° is typical for triples

Curvature (optional) Curve slightly adjusts effective width (chord)

Result

Horizontal FOV

—°

Primary for iRacing, rF2, AMS2, LMU (usually)

Vertical FOV

—°

Use this in Assetto Corsa Competizione

Active image width × height

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Triple configuration

Triple tips

In iRacing set the calculated horizontal FOV and enable triple screens in graphics options.
Measure the bezel with a ruler: black border of screen A + gap + black border of screen B.
Measure the angle between centre and side screen (not relative to the wall).
Sit closer or further? Recalculate — FOV depends heavily on viewing distance.
Unsure? Ask in our Discord — someone with triples will help.

How does the calculation work?

We use the real physical width of your screen (from diagonal + aspect ratio) and your viewing distance. Horizontal FOV is:

FOV = 2 × arctan((width / 2) / distance) for a single screen.

For triples we model the side monitors with bezel and fold angle. FOV runs to the outer edge of the outer screens — so the horizon and perspective in the sim match what you see in real life.

More on hardware? See building a sim racing rig or getting into sim racing.

FOV FAQ

Which FOV do I use in iRacing?

The horizontal FOV from this tool. Enable triples in graphics options and enter the calculated value in degrees.

And in Assetto Corsa Competizione?

ACC uses vertical FOV — take that result from the calculator.

How do I measure the bezel?

With a ruler: black border of screen A + gap + black border of screen B, per join. Typically 10–20 mm depending on your monitors.

What angle is good for triples?

Often 45–60°. Measure the angle between centre and side screen. Slightly more open is usually safer if you do not have a fixed cockpit yet.