FOV Calculator
Convert between horizontal and vertical field of view for any aspect ratio — the math behind FOV settings in CS2, Valorant, Apex and sim racing.
Games measure FOV differently: CS2 uses horizontal FOV, Valorant uses horizontal-in-out-values, many console titles use vertical FOV. This calculator converts between the two so you can match your peripheral vision across titles.
How it works
Horizontal and vertical FOV are linked by the aspect ratio through tangent geometry:
vfov = 2 × atan( tan(hfov ÷ 2) ÷ aspect )hfov = 2 × atan( tan(vfov ÷ 2) × aspect )
Example
90° horizontal on a 16:9 screen equals 2 × atan(tan(45°)/1.7778) ≈ 55.8° vertical. On an ultrawide 21:9 it's ≈ 43.9° vertical — identical horizontal span, wider screen.
The math behind it
vfov = 2·atan(tan(hfov/2)/aspect) · hfov = 2·atan(tan(vfov/2)·aspect)
Frequently Asked Questions
Does FOV affect sensitivity?
In most FPS games, no — 360 distance stays constant regardless of FOV. (Overwatch 2 is an exception; it scales sensitivity with FOV.) A wider FOV just means more peripheral view.
What FOV do pros use?
Valorant forces a fixed FOV; CS2 pros typically use 90–106 horizontal; Apex and OW2 run near max (110 and 103 max respectively). Higher FOV = more awareness, smaller targets.