The Field of View Calculator (or FOV) is used to help predetermine proper lens selection prior to installation. With this Calculator you can calculate the camera lens focal length, and field of view to find best camera position.
This handy FOV calculator will help you in determining which lens is right for your application. Enter the camera lens format, the distance to the object, focal length of the lens, and click "Calculate" to see the field of view you can expect with that lens. It also works in reverse. If you know the field of view you need, enter it and the distance to the object along with camera format to find the focal length you will need to get the field of view desired.