Lens Angle of View Calculator

How it is calculated

Each angle follows AOV = 2 × arctan(d / (2 × f)) in degrees, where f is the focal length in mm and d is the sensor dimension in mm. The tool runs it three times: with the sensor width for the horizontal angle, the sensor height for the vertical angle, and the diagonal √(width² + height²) for the diagonal angle. All three inputs must be in millimetres and greater than zero, otherwise there is no result. The sensor size you type is what matters: the tool does not know your camera, so a crop sensor needs its own width and height. The focal length is used as marked on the lens, and it is assumed to be focused at infinity, so close-focus lenses that change their effective focal length will frame slightly differently.

Common mistakes

• Typing the sensor size in inches or in the "1/2.3-inch" style of the spec sheet. The fields take real width and height in millimetres.
• Swapping width and height. The wider side of the sensor gives the horizontal angle, so reversed values mix up the two results.
• Quoting the diagonal angle as the lens angle. Spec sheets usually list the diagonal, and the horizontal angle of the same lens is noticeably smaller.
• Entering the 35 mm equivalent focal length together with the real sensor size, which counts the crop factor twice. Use the actual focal length with the actual sensor.
• Expecting a zoom lens to have one answer. Calculate it separately at each end of the zoom range.