FOV Type is not related to your aspect ratio, it is simply a way to express field of view. Games use different FOV Types, so the calculator will change according to the game you select. This is the value you type into the calculator is correct for the game you have selected. If you want to convert between different FOV Types, you can select the same FOV Type and value, and check the output for the Config FOV to achieve the desired FOV, like in this example:
The important part is the the "Actual HFOV" is identical, like it correctly is in your screenshot. Special for Kovaak's is that the "FOV Measurement" selection affect the FOV Type.