FOV Calculator
Convert between horizontal, vertical, and diagonal FOV for any aspect ratio. See how your FOV compares across CS2, Valorant, Apex, and more.
Horizontal
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hFOV
Vertical
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vFOV
Diagonal
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dFOV
vs. 90° hFOV standard
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Common game FOV reference (16:9)
Formula: vFOV = 2 × atan(tan(hFOV/2) × height/width). All values in degrees.
What is FOV Calculator?
This FOV calculator converts between horizontal, vertical, and diagonal fields of view for any screen aspect ratio. FOV is the angle of the game world visible on screen — a wider FOV shows more peripheral vision but can distort objects at the edges. Different games expose different FOV types (CS2 uses horizontal, Valorant uses horizontal, some games use vertical), so this tool lets you find the equivalent setting regardless of which type your game uses.
How to use
- 1 Enter your FOV value.
- 2 Select whether that value is Horizontal, Vertical, or Diagonal.
- 3 Select your monitor aspect ratio (16:9, 21:9, 16:10, or 4:3).
- 4 All three FOV types appear instantly.
- 5 Use the game reference table to see how your FOV compares to common competitive defaults.
Formula
Example calculation
90° horizontal FOV at 16:9: vFOV = 2 × atan(tan(45°) × (9/16)) = 58.72°. dFOV = 2 × atan(tan(45°) × (√(16²+9²)/16)) = 100.39°.
Frequently asked questions
What FOV should I use for competitive FPS?
Most competitive players use 90°–103° horizontal FOV at 16:9. CS2 defaults to 90° hFOV (fixed). Valorant uses 103° hFOV at 16:9. Wider FOV gives more situational awareness but shrinks targets slightly.
Does changing aspect ratio change my FOV?
It depends on the game. CS2 uses hor+ scaling: wider aspect ratios give a wider hFOV from the same setting. Some games use vert- scaling where a narrower aspect ratio crops the top and bottom instead. Check your game's scaling method.
What is the difference between horizontal and vertical FOV?
Horizontal FOV is the angle from left to right edge of your screen. Vertical FOV is top to bottom. They are linked by your aspect ratio — you only need to set one and the other follows automatically.
Why does 90° feel different in different games?
The same hFOV number can feel different because of camera position (first-person vs third-person), weapon model size, animation speed, and whether the game uses true horizontal FOV or a scaled variant. The numbers are mathematically equivalent but the subjective feel varies.
What FOV do pros use in CS2?
CS2 locks horizontal FOV at 90° in competitive mode regardless of settings. The only way to affect perceived FOV is by changing aspect ratio — some pros play 4:3 stretched which gives a narrower actual FOV but larger-looking player models.