Excellent! It's great to see developers here, and see that they take the small things like this seriously
Is the FOV directly tied to your speed value? Some prefer a constant 360 distance for the sensitivity, but others might prefer a sensitivity based on the FOV. So I can make the calculator accept the speed as an input that affects the FOV, so if they for instance enter a speed of 180 the FOV will be calculated based on this, and any FOV based sensitivity calculation will work accordingly.
(I've put you in the game developer group so you can test everything).