You can use these calculators to calculate field of view (FOV) and angles of view.
Field of View Calculator
This calculator is only valid for flat films formats. It can't be used to calculate the field-of-view of a true panoramic camera with rotating lens.
Panoramic Image Projections
The following calculator can be used to estimate your camera's vertical and horizontal angles of view for different lens focal lengths, which can help in assessing which projection type would be most suitable.