iRacing FOV Calculator
Achieve perfect 1:1 realism and improve your lap times by calculating the mathematically correct Field of View for your specific sim racing setup.
Enter the width of the visible screen area of one monitor. Do not use the diagonal size.
Measure the distance from your eyes to the center of your screen.
Calculation Breakdown
Horizontal FOV:
Calculated Monitor Height:
Total Horizontal FOV (Triples):
What is an iRacing FOV Calculator?
An iRacing Field of View (FOV) calculator is a specialized tool designed to determine the mathematically correct viewing angle for the racing simulator iRacing. The goal is to make the view from your monitor(s) act as a true window into the virtual world, ensuring that the scale, speed, and depth perception are as realistic as possible. Getting this setting right is one of the most critical steps for both immersion and on-track performance, as it directly affects your ability to judge braking points, apexes, and distances to other cars.
iRacing FOV Formula and Explanation
While many simulators use horizontal FOV, iRacing’s in-game setting is based on **Vertical FOV (vFOV)**. The calculation requires your monitor’s height and your distance from it. This calculator determines the height from the width and aspect ratio you provide.
The core formula is:
vFOV (degrees) = 2 * arctan( (MonitorHeight / 2) / ViewingDistance ) * (180 / π)
This trigonometric formula calculates the angle from your eyes to the top and bottom edges of your screen.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| MonitorHeight | The vertical height of the visible screen area. | cm or inches | 25 – 50 cm |
| ViewingDistance | The distance from your eyes to the screen surface. | cm or inches | 50 – 100 cm |
| arctan | The inverse tangent function, used to find the angle. | – | – |
| vFOV | The resulting Vertical Field of View. This is the value to enter in iRacing. | Degrees (°) | 40° – 90° |
Practical Examples
Example 1: Single Ultrawide Monitor Setup
- Inputs: Single 21:9 monitor with a visible width of 80 cm, viewed from 70 cm away.
- Calculation: The calculator first finds the monitor height (approx. 34.3 cm). It then uses the vFOV formula.
- Results: This yields a vertical FOV of approximately 27.6°. While this seems low, it provides a perfect 1:1 scale. The corresponding horizontal FOV would be much wider, around 60°.
Example 2: Triple Monitor Setup
- Inputs: Three 16:9 monitors, each 60 cm wide, viewed from 65 cm away, with side monitors angled at 45°.
- Calculation: The vertical FOV is based on the center monitor, so the calculation is the same as for a single screen. The calculator finds the monitor height (33.75 cm) and applies the formula.
- Results: The correct iRacing Vertical FOV is 29.2°. The calculator would also note that the side monitor angle to input into iRacing is 45°, and the total horizontal field of view across all three screens would be massive, well over 120°.
How to Use This iRacing FOV Calculator
- Select Monitor Setup: Choose between a ‘Single Monitor’ or ‘Triple Monitors’ setup.
- Measure Monitor Width: Use a tape measure to find the width of the *visible screen area* of a single monitor. Do not measure the bezel or the diagonal. Enter this value. For a guide on setting up triple monitors, you can check out resources on YouTube.
- Set Aspect Ratio: Select your monitor’s aspect ratio from the dropdown. This is crucial for calculating the correct height.
- Measure Viewing Distance: Sit in your normal driving position. Measure the distance from your eyes directly to the surface of the center of your screen.
- Select Units: Ensure you choose the same unit (cm or inches) that you used for your measurements.
- Enter Side Angle (for Triples): If using a triple setup, enter the angle of your side screens.
- Click Calculate: The tool will display the correct Vertical FOV to enter into iRacing’s graphics options.
- Interpret Results: The primary result is your vFOV. The breakdown provides additional useful data like your horizontal FOV.
Key Factors That Affect iRacing FOV
- Viewing Distance: This is the most impactful factor. Moving closer to your screen dramatically increases the correct FOV. Moving further away decreases it.
- Monitor Size (Width & Height): A larger screen, at the same distance, will naturally require a higher FOV to maintain a 1:1 scale.
- Aspect Ratio: Ultrawide and super ultrawide monitors have a much wider horizontal FOV for the same vertical FOV compared to a standard 16:9 screen.
- Triple Monitor Angle: For triple screens, the angle of the side monitors determines the “wrap-around” effect and the total horizontal field of view.
- Single vs. Triple Screen: A triple-screen setup provides peripheral vision that is impossible to replicate on a single screen, offering a huge competitive advantage.
- User Comfort vs. Mathematical Purity: While a mathematically correct FOV provides a 1:1 scale, some users with small or distant screens may find it too restrictive. It’s a balance between what is correct and what is usable.
Frequently Asked Questions (FAQ)
This is a common first impression. A wide, incorrect FOV creates a “fish-eye” effect that exaggerates the sense of speed. A mathematically correct FOV presents the world at a 1:1 scale. It may feel slower initially, but your brain will adapt, leading to much better consistency and car control because your perception of distance and speed is now accurate. For more details on adapting to the right FOV, see this sim racing guide.
hFOV measures the viewing angle from side to side, while vFOV measures it from top to bottom. Different games use different standards. iRacing uses vFOV in its settings, which is why our iRacing FOV calculator provides that value as the primary result.
Once you are in the car, go to the “Options” then “Graphics” tab. The “Field of View” setting is located there. You can also adjust it live in the car using the graphics adjustment black box.
Yes. For FOV calculation, a curved monitor is treated the same as a flat one. You should measure the straight-line width of the visible screen, not the arc length. The subtle curve has a minimal impact on the geometric calculation.
A very low FOV usually means your screen is either too small for your viewing distance or you are sitting too far away. If moving the monitor closer isn’t an option, you may need to compromise and use a slightly higher FOV than calculated for better visibility, though you will lose the perfect 1:1 scale.
In the iRacing graphics options, you need to input the monitor width, bezel width, and viewing distance. The game has a built-in tool that uses these values to calculate the FOV for you, but it’s good to verify with a standalone iRacing FOV calculator like this one. You’ll also need to set the angle between screens in the app.ini file for the most accurate rendering. For a detailed walkthrough, refer to the official iRacing support page.
No. ACC, like the original Assetto Corsa, uses Vertical FOV but it may not be identical. Other games may use Horizontal FOV. You should always use a calculator specific to the game you are playing. This is specifically an iRacing FOV calculator. For an ACC specific calculator, visit a dedicated FOV tool.
VR headsets have their FOV set automatically by the hardware and software, so you do not need to perform any manual calculations.
Related Tools and Internal Resources
- Sim Racing Setup Guide: A complete guide to building your first sim rig.
- Best Direct Drive Wheels of 2026: A review of the top direct drive wheelbases on the market.
- Load Cell Pedals Explained: Understand the technology that will make your braking more consistent.
- How to Choose a Sim Racing Monitor: A deep dive into single, triple, and ultrawide monitor setups.
- Assetto Corsa Competizione FOV Calculator: Find the correct FOV for Kunos’ GT racing simulator.
- Bezel-Free Kit Installation Guide: Learn how to make the gaps between your triple monitors disappear.