Sim Racing FOV Calculator

Field of view is the angle your screen occupies from where your eyes are, and it goes wrong in both directions. Too wide is the usual mistake, because it shows more and feels faster: everything then sits further away than it really is, so corners arrive sooner than they look. Too narrow magnifies the view instead, and takes the apex and the car alongside you out of frame before you are past either.

Start from a common screen, then measure your own seat:

Drag to look around, or use the arrow keys. On a phone, tap it first: it lets you scroll past until you ask it not to, and so does the wheel on a desktop.

The controls need JavaScript, so the table below is for a 27 inch 16:9 screen at 60cm. To work out your own, the formula is 2 × atan(size ÷ (2 × distance)), in degrees, using the width of one screen for horizontal and its height for vertical.

Enter the value for your sim. The axis column is why they differ.
Sim	Value	Axis	Where it lives
iRacing	53.0°	Horizontal	Options, Drive tab. Also `app.ini` in Documents\iRacing.On triples, iRacing wants the centre screen value here, not the three added together. Bezel width and screen angle go in its own triple settings.
Assetto Corsa	31.3°	Vertical	In car, the on-screen display settings.
Assetto Corsa Competizione	31.3°	Vertical	Settings, Graphics, FOV. Also under View Settings in the pause menu.The separate FOV offset slider shifts the view without changing the angle, so it does not affect this number.
rFactor 2	31.3°	Vertical	Options, Display, Field of View.
Le Mans Ultimate	31.3°	Vertical	Settings, Graphics, Visuals. The setting is named Vertical FOV.A fresh install reads Default rather than a number, which is not the same as correct.

Horizontal 53.0°, vertical 31.3°, for one screen at that distance.

Or work it backwards: where do I sit?

Some sims clamp the value and some sliders stop short. Give it the angle you are stuck with and it says where that angle becomes correct.

The angle you are stuck with Degrees, exactly as the sim shows it.

Which sim it is in It decides which axis the number is on.

Your screen and its curvature come from the form above.

Worth knowing

The sims agree about the geometry and disagree about how to ask for it. iRacing wants the horizontal angle, the other four want the vertical one. Entering one where the other belongs is the most common way a correct calculation still ends up wrong in game.
A curved screen wants a wider number than a flat one, which surprises most people. Bending the panel pulls the edges in sideways but also brings them closer to your face, and closer wins.
Automobilista 2, BeamNG and RaceRoom are missing on purpose. Published guides contradict each other about which axis they read. A missing sim is honest. A wrong number is not.

Once the view is right

The seat stays done. What does not is everything you open around the sim, so SimLauncher starts your overlays, telemetry and voice comms with the game and closes them afterwards. Free and open source.

Still deciding what to run? The sim racing app index has pricing and a dated development status on every entry, and the ranked iRacing guide is the shorter answer.