UtilityBaseCalculators
FOV Calculator
Convert horizontal and vertical field of view for any aspect ratio.
Updated July 10, 2026
How to use the fov calculator
- 1Enter your field of view in degrees.
- 2Choose whether it's horizontal or vertical.
- 3Pick your monitor's aspect ratio.
- 4Read both the horizontal and vertical FOV.
Common uses
- Converting a FOV setting to an ultrawide monitor
- Matching FOV between games that use different axes
- Setting vertical FOV from a known horizontal value
- Comparing FOV across aspect ratios
Frequently asked questions
What's the difference between horizontal and vertical FOV?
They measure the visible angle across different axes. Some games set FOV horizontally, others vertically, and the two differ by your aspect ratio. A 90-degree horizontal FOV on 16:9 is about a 59-degree vertical FOV — the same view described on different axes.
Why does aspect ratio change the FOV?
Because the screen shape determines how horizontal and vertical angles relate. With the common Hor+ scaling, vertical FOV stays fixed and a wider screen adds more horizontal view — which is why ultrawide monitors show more at the sides than a 16:9 display at the same setting.
What FOV should I use?
It's personal, but higher FOV increases peripheral awareness (popular in competitive shooters) at the cost of fisheye distortion and smaller-looking targets near the edges. Match the axis a game uses; if it asks for vertical FOV and you know a horizontal value, convert it here.
About this tool
The FOV calculator converts a game's field of view between the horizontal and vertical axes for a given aspect ratio, so a setting that feels right on 16:9 translates correctly to 16:10, ultrawide, or 4:3. Enter a FOV, choose whether it's horizontal or vertical, pick your aspect ratio, and it returns both. The wider the aspect ratio, the larger the horizontal FOV for the same vertical — the reason ultrawide monitors reveal more at the sides. All the trigonometry runs in your browser.
Like most tools on UtilityBase, the fov calculator runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more calculators here.
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