Vertical FOV Calculator
Convert between horizontal, vertical, and diagonal FOV using your display aspect ratio. This vertical FOV calculator and fov converter helps when games or spec sheets use different axes—enter one known value and get the other two instantly for sim racing, ultrawide monitors, and content creation.
Vertical FOV Converter
Results
Convert Vertical FOV to Horizontal FOV
Some titles expose vertical FOV in settings while hardware guides quote horizontal. Given vertical FOV and aspect ratio, horizontal FOV = 2 × arctan(tan(vertical ÷ 2) × aspectWidth ÷ aspectHeight). A 58° vertical on 16:9 converts to roughly 90° horizontal.
Ultrawide 21:9 and 32:9 panels change the multiplier—never assume 16:9 when converting. Select the ratio matching your game resolution or monitor spec for accurate fov converter output.
Convert Horizontal FOV to Vertical FOV
Horizontal-to-vertical conversion divides the half-angle tangent by aspect ratio. Sim racers who calculate horizontal FOV from screen size often need this step for Assetto Corsa Competizione and other vertical-FOV games.
Pair with the sim racing FOV calculator for geometry-based horizontal input, then convert here before entering game menus.
Diagonal FOV Conversion
Diagonal FOV spans corner to corner and matches some manufacturer marketing for webcams and gaming monitors. Given horizontal FOV, diagonal expands with the Pythagorean relationship of width and height components in angular space.
When a spec sheet lists only diagonal fov, enter it here with the correct aspect ratio to derive horizontal and vertical components for sim setup or streaming camera planning.
Aspect Ratio and Screen Size
Aspect ratio alone determines conversion between FOV axes; screen diagonal is optional context for physical setups. A 27-inch 16:9 monitor and a 27-inch 21:9 monitor share diagonal size but produce different horizontal FOV at the same viewing distance because width differs.
Optional screen diagonal helps relate angular output back to the home FOV calculator when cross-checking coverage width at a measured distance.
FOV Conversion Formula
All conversions assume rectilinear projection—the standard for photography and most sim engines. Fisheye or curvilinear games may not match these outputs. The core relationship ties horizontal and vertical half-angle tangents to aspect ratio.
Angular field of view values are not additive: you cannot average horizontal and vertical FOV. Always convert through tangent half-angles for mathematically consistent results.
Frequently Asked Questions
Vertical FOV is the angular height of the visible scene in degrees. Games that adjust vertical FOV keep horizontal constant when you change aspect ratio, or vice versa. Knowing which axis a game uses prevents mismatched sim settings.
Use vertical = 2 × arctan(tan(horizontal ÷ 2) ÷ aspectRatio). Select horizontal input above, choose your aspect ratio, and read the vertical output. Example: 90° horizontal on 16:9 ≈ 58.7° vertical.
Engine design and historical UI choices differ. Some racing sims use vertical FOV because it stays stable when changing resolution height. Others use horizontal because monitor marketing cites width-based angles. Convert instead of guessing.
Yes. Wider aspect ratios yield larger horizontal FOV for the same vertical angle, or smaller vertical FOV for the same horizontal angle. Always pick 21:9 or 32:9 here if that matches your display or in-game resolution.