FOV Calculator
Calculate field of view for a monitor, sim rig, camera lens, telescope, microscope, or security camera. The screen calculator below outputs geometry-matched values for iRacing, ACC, Assetto Corsa, LMU, and other documented titles, plus a lens tab for sensor angle of view.
Screen & Gaming FOV Calculator
Set your screen ratio, size, viewing distance, and monitor setup to calculate geometry-based horizontal, vertical, and total field of view values.
Core FOV Results
Geometry-based values from your screen size and viewing distance. Apply only the axis documented by your game and verify its current display settings.
Current vs saved setup
Saved setup loaded. Change screen size, distance, or monitor options above to see differences.
Current
Saved
| Game / setting | Current | Saved |
|---|---|---|
FOV values by game
Each row is the same geometry converted to the axis or unit that title documents. Confirm the current in-game setting before applying it. Forza, Gran Turismo, and other unitless sliders are undocumented, so use the core horizontal or vertical value only.
| Game / setting | Value to enter |
|---|---|
Compare your in-game FOV
Enter the FOV shown in your game to check if it is too wide or too narrow versus geometry.
Lens & Sensor FOV Calculator
Calculate horizontal, vertical, and diagonal field of view from sensor size and focal length for cameras and optics.
Results
What Is an FOV Calculator?
An FOV calculator converts physical setup details into angular field of view values measured in degrees. For monitors and sim rigs, that means screen size, aspect ratio, and eye-to-screen distance. For cameras and lenses, it means sensor size and focal length. Field of view describes how wide an area you see at a given distance whether through a display or a lens.
The primary screen calculator on this page matches the geometry used by popular sim racing FOV tools: it outputs per-monitor and total horizontal FOV plus vertical FOV, then lists the number each documented game expects. Check which FOV axis your game uses before entering a value. Switch to the Lens & Sensor tab for classic angle-of-view math with coverage at distance.
Why People Use an FOV Calculator
Field of view matters whenever you need to know what will fit inside a frame before you commit to hardware or settings. A photographer checks angle of view to choose the right lens for a group portrait, while a sim racer uses the same angular field of view concept to match on-screen perspective to real-world eye position.
Without a calculator, you would need to look up tangent formulas or cross-reference manufacturer charts. Our tool removes that friction by updating results live as you change inputs, so you can compare scenarios side by side in seconds.
Main Features
The screen calculator supports single and triple monitors, curved displays with radius, bezel thickness, and cm/inch distance units. Results update instantly and show each geometric FOV axis, so you can apply the axis documented by your game.
The lens tab outputs horizontal, vertical, and diagonal FOV from sensor width and focal length, plus coverage width and height at distance. For specialized workflows, use our dedicated tools: the vertical FOV converter swaps between horizontal, vertical, and diagonal values, while sibling calculators cover cameras, sim racing, security systems, telescopes, and microscopes.
How to Calculate Field of View
For monitors, horizontal FOV is derived from screen width and viewing distance using basic trigonometry: FOV = 2 × arctan(width ÷ (2 × distance)). Triple-screen setups do not multiply that per-monitor angle by three. Side panels rotate toward you, so total wrap is measured from the outer edges with bezel width included. Curved single monitors use arc geometry with your panel radius. Vertical FOV follows from screen height and the same distance.
For lenses, the standard formula is FOV = 2 × arctan(sensorSize ÷ (2 × focalLength)). Horizontal FOV uses sensor width; vertical FOV uses sensor height; diagonal FOV uses the sensor diagonal. Our live calculators handle both monitor and lens workflows so you only need to adjust inputs and read results instantly.
Device and Use Case Compatibility
Different fields share the same math but different defaults. Photographers start with camera FOV presets for full-frame, APS-C, Micro Four Thirds, 1-inch, webcam, and typical phone-main sensors. Racers head to the sim racing FOV calculator for screen-size-based recommendations in iRacing, ACC, Assetto Corsa, and LMU.
Astronomers use the telescope FOV calculator for eyepiece true field, lab students rely on the microscope field of view calculator for diameter at magnification, and installers plan coverage with the security camera FOV calculator.
Why an FOV Calculator Is Helpful
Correct FOV improves spatial judgment. In photography it prevents unexpectedly tight framing, and in VR and gaming it reduces motion discomfort by aligning rendered perspective with natural vision. Comparing your result to human field of view — roughly 200° horizontal peripheral awareness but about 55° of focused attention — helps you judge whether a lens or monitor setup feels natural.
Human vision field of view varies with eye movement, but seated sim racing typically targets the narrower binocular segment that matches your monitor arc. Field of view VR guidelines recommend matching geometric FOV to hardware rather than maximizing the in-game slider.
Pros and Cons
Pros: instant results, no account required, works on mobile, and covers multiple disciplines from one site. The formulas are standard optics equations used in lens datasheets, so outputs align with manufacturer specs when inputs are accurate.
Cons: results assume ideal rectilinear projection and do not account for lens distortion or crop modes that change the active sensor area. Triple-screen math includes bezel thickness and side-panel angle, but it still cannot model every cockpit obstruction. Always verify critical installs with manufacturer tools or physical measurements.
Frequently Asked Questions
FOV (field of view) is the angular extent of a scene visible through a lens or display, usually measured in degrees horizontally, vertically, or diagonally. A wider FOV captures more area at the same distance but makes subjects appear smaller. Narrow FOV magnifies the center at the expense of peripheral context.
For a monitor, divide screen width by twice the viewing distance, take the arctangent, and multiply by two. For a lens, use sensor width instead of screen width and focal length instead of viewing distance. Repeat with height for vertical FOV. The calculator on this page runs both formulas live: Screen & Gaming for displays, Lens & Sensor for cameras.
There is no universal best FOV, it depends on use case. Sim racers often target 50–70° horizontal to match monitor geometry. Security installers may want 90–110° for doorway coverage. Portrait photographers prefer narrower angles around 35–50° horizontal on full-frame. Match FOV to your goal rather than maximizing the number.
In photography and optics, field of view and angle of view usually refer to the same thing: the angular width of the scene. Some manufacturers distinguish angle of view as the lens specification and field of view as the resulting scene coverage at a distance, but the underlying formula is identical.
Conclusion
Whether you need a quick fov calculator check or a deeper angle of view analysis, start here and branch to specialized tools for your hardware. Bookmark the pages you use most and share results with teammates when planning camera placements, racing rigs, or lab measurements.
All calculators on fovcalculator.net run client-side in your browser and no data is sent to a server. You can experiment freely with sensor sizes, distances, and aspect ratios until the numbers match your real-world setup.