How do you find out the FOV for whichever game you play because the calculator one is inconsistent

[NomaKasd]

As the title describes the fov auto setting is a little wonky and I'm just wondering is there a program that shows your feidl of view just like programs can show your fps settings?

[DPI Wizard]

If you enter your resolution and configured FOV value for the game (leaving the FOV Type at the pre-selected option), the correct FOV will be calculated.

If the game does not have a configurable FOV, leave it at the default value in the calculator.