Horizontal and vertical FOV for a game display
PC / FPS
Convert a rectilinear horizontal FOV to vertical FOV using the active viewport ratio. A game with a fixed baseline or fisheye camera may interpret its slider differently.
Result
- Vertical FOV (°)
- 58.7155
Formula
vFOV = 2 × atan(tan(hFOV / 2) × height / width)
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Using this reference
Check whether the game asks for horizontal or vertical FOV before using the result. This tool takes a horizontal angle and converts it using the entered aspect ratio. Swapping width and height changes the geometry; it is not another way to enter the same display.
For a 16:9 display, 90° horizontal is about 58.72° vertical. Use that as a quick input check, then enter your own dimensions. This geometric conversion does not account for a game that locks FOV to a reference aspect ratio or changes it while aiming.
Sources and scope
Public source snapshot; changes after this version may differ. 2026-11-03