Source FOV Calculator

What's the Deal?

Source follows the usual Quake-derived behavior: widescreen support scales horizontal FOV to preserve vertical FOV. That means the same config value produces a wider real view on wider displays.

This is deterministic, not subjective. If you want to inspect the implementation directly, the formula is in the inline javascript above.

What's My Real FOV?

Convert a Source FOV setting into the actual horizontal FOV for your display.

FOV Setting

Display Aspect Ratio

Actual FOV

What Should I Set?

Reverse the calculation to find the Source setting that matches a target real FOV.

Desired FOV

Display Aspect Ratio

Respective Setting

Reference aspect ratio is 4:3, matching Source's original FOV convention.