Here is a fov converter if you want the same equivalent fov in different games or fov types/ratios or just find the true fov, if you don't know the fov of your game use this tool to find it: https://www.desmos.com/calculator/3e9hs7usyr
Output FOV = atan(((Output FOV Ratio)/(Input FOV Ratio)) * tan(oldFOV * PI/360)) * 360/PI when using radians if using degrees then change * 360/pi to * 180