Calculadora de Campo de Visão da Câmera (FoV)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
FoV = 2·atan(sensor/(2f)) × 180/π
About this calculator
This calculator determines the horizontal field of view of a camera based on sensor size and lens focal length. The field of view (FoV) is the angle the camera can capture, measured in degrees. The formula used is FoV = 2 × arctan(sensor / (2 × focal length)), converting the result from radians to degrees. It is an essential tool for photographers, videographers, and surveillance professionals who need to predict the area covered by the camera.
To use the calculator, input the camera sensor size (in millimeters) and the lens focal length (also in millimeters). The result is the horizontal viewing angle. Remember that sensor size varies by camera model: full-frame cameras have a 36 mm sensor, APS-C about 24 mm, and Micro Four Thirds approximately 17.3 mm. The calculator assumes a rectangular sensor and computes the horizontal FoV.
When to use this tool? For example, when choosing a lens for landscape photography, a wide FoV (above 60°) is desirable. In security, to estimate camera coverage in an indoor environment. Or in video production, to ensure the framing captures the entire desired scene. The calculator helps avoid purchasing mistakes or framing planning errors.
Cautions: the calculation considers the sensor's horizontal dimension; for vertical or diagonal FoV, adjust the sensor value. The focal length should be the actual one, not the 35 mm equivalent. Additionally, the formula assumes lenses without distortion; wide-angle lenses may have distortion that alters the actual FoV. Always check manufacturer specifications for accurate results.
Frequently asked questions
What is the difference between horizontal and vertical FoV?
Horizontal FoV is the viewing angle across the image width, while vertical FoV is across the height. This calculator provides horizontal FoV; for vertical, use the sensor height instead of width.
How do I know my camera's sensor size?
Check the camera manual or search for the model online. For example, full-frame cameras have a 36 mm x 24 mm sensor, APS-C about 24 mm x 16 mm, and Micro Four Thirds 17.3 mm x 13 mm.
Can I use the 35 mm equivalent focal length?
No, use the actual focal length of the lens. The equivalent is a conversion for comparison with full-frame, but the correct calculation requires the real focal length and the actual sensor size.
Does the result change if I use a zoom lens?
Yes, FoV varies with focal length. The calculator gives the value for the entered focal length. For zooms, calculate for each extreme or desired position.
Is this calculator suitable for security cameras?
Yes, it is useful for estimating the coverage angle of surveillance cameras, helping to position them properly. Just input the sensor size and lens focal length of the camera.