FOV Calculator

Convert horizontal and vertical field of view for a display aspect ratio.

About the FOV Calculator

Field of view can be expressed horizontally or vertically, so the equivalent angle depends on display aspect ratio.

How to use it

  1. Enter the source FOV angle.
  2. Enter the display aspect-ratio width and height.
  3. Choose a conversion direction and calculate.

How it works

The converter uses tangent-based perspective geometry to translate the half-angle across the horizontal and vertical dimensions of the selected aspect ratio.

Example

A 90-degree horizontal FOV at 16:9 corresponds to about 58.72 degrees vertically.

Notes

Games may label FOV differently or apply Hor+, Vert- and custom scaling. Confirm which axis the selected game setting represents.