Lens Angle of View Calculator

About this calculator

The angle of view of a lens is the extent of a scene captured on the sensor, calculated as AOV = 2 × arctan(d / (2f)), where d is the sensor dimension (width, height, or diagonal) and f is the focal length. A shorter focal length or larger sensor widens the angle of view, while a longer focal length or smaller sensor narrows it — which is why the same 50mm lens frames dramatically differently on a full-frame body versus an APS-C or Micro Four Thirds camera.

Because sensor size varies so much between formats, angle of view (not focal length alone) is what actually determines how “wide” or “telephoto” a shot looks. Photographers, cinematographers, and lens manufacturers use this calculation to compare lenses across different camera systems, choose the right focal length for architecture, portraiture, or landscape work, and convert a lens's field of view when switching between full-frame and crop-sensor bodies.