📷 Field of View Calculator
Enter your sensor and focal length to get the angle of view — and how much of a scene fits in the frame at a given distance.
Horizontal
39.6°
Vertical
27°
Diagonal
46.8°
At 10 m you capture a frame ≈ 7.2 × 4.8 m.
Angle of view = 2 × arctan(sensor dimension ÷ (2 × focal length)) — narrower for longer lenses and smaller sensors. A 50mm lens is a "normal" ~47° diagonal on full frame. The frame size shows how much of a scene fits at a given distance. 🔒 In your browser.
How the field of view calculator works
The angle of view is how wide a scene a lens captures: 2 × arctan(sensor dimension ÷ (2 × focal length)), worked out separately for the sensor's width, height and diagonal. From the angle and a subject distance, the tool also gives the real-world width and height of the frame you'll capture.
A shorter focal length or a larger sensor gives a wider angle of view. On full frame, a 50mm lens is "normal" (about 47° diagonal, close to human central vision); under about 35mm is wide-angle, and over about 85mm is telephoto.
Frequently asked questions
What is field of view in photography?
How much of a scene a lens and sensor capture, expressed as an angle. A wide-angle lens has a large field of view (fits a lot in); a telephoto has a narrow one (magnifies a small area).
How do I calculate angle of view?
Angle of view = 2 × arctan(sensor dimension ÷ (2 × focal length)). Use the sensor's width for the horizontal angle, height for vertical, and diagonal for the diagonal angle. The tool computes all three.
What focal length gives a "normal" view?
Roughly the sensor's diagonal — about 43–50mm on full frame, 28–35mm on APS-C, 25mm on Micro Four Thirds. A normal lens sees the scene at about the same magnification as your eye.
How much will fit in my frame at a distance?
The tool gives the frame's real width and height at any subject distance from the angle of view. For example a 24mm lens on full frame captures roughly a 15 × 10 m area at 10 m.
How does sensor size change the field of view?
A smaller sensor "crops" the view, giving a narrower field of view for the same lens. That's the crop factor — a 50mm lens on APS-C frames like a 75–80mm lens does on full frame.