Camera Field of View (FOV) Calculator
Enter lens focal length and sensor size to get horizontal, vertical and diagonal field of view in degrees, plus framed dimensions at any distance and the 35mm equivalent focal length.
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Frequently Asked Questions
How is field of view (FOV) calculated?
From the thin-lens similar-triangle relation, the angle of view for one dimension is α = 2·arctan(sensor dimension / (2 × focal length)). Substituting the sensor width, height and diagonal gives the horizontal, vertical and diagonal field of view in degrees.
What does 35mm equivalent focal length mean?
Equivalent focal length = actual focal length × crop factor, where crop factor = full-frame diagonal (≈43.27mm) / your sensor diagonal. It lets you compare angles of view across formats — e.g. a 35mm lens on APS-C sees about like 52mm on full frame.
How do I know what area I can frame at a given distance?
Framed width = sensor width / focal length × distance, and framed height = sensor height / focal length × distance (keep units consistent). Enter a shooting distance to get the covered width and height at that distance.