Pick your sensor and focal length to get the horizontal, vertical and diagonal angle of view and the size of the scene the camera sees at your subject distance. You can also work backwards and find the focal length that fits a given width.
Last updated:
Calculate
Lens & sensor
mm
mm
mm
Subject
Width of the scene to fit across the frame, in the distance unit.
Enter your values to see the result.
Advertisement
Advertisement
How to use the Camera Field of View Calculator
Choose what to calculate: the angle of view for a lens, or the focal length needed to fit a scene.
Enter the focal length printed on the lens (the real focal length, not the equivalent).
Select your sensor size or enter a custom width and height in millimetres.
Enter the subject distance in metres or feet to see how wide and tall the frame is there.
Compare focal lengths in the table and download it as CSV if you are planning a shoot.
Angle of view formula
For a normal (rectilinear) lens, the angle the camera sees depends only on the sensor size and the focal length:
Use the sensor width for the horizontal angle, the height for the vertical angle and the diagonal (√(w² + h²)) for the diagonal angle that lens makers usually quote.
The size of the scene at distance d is frame width = d × sensor width ÷ focal length (and the same with the height).
Example: a 50 mm lens on a full-frame sensor (36 × 24 mm) has a horizontal angle of 2 × atan(36 ÷ 100) = 39.6°, a vertical angle of 27.0° and a diagonal angle of 46.8°. At 10 m it covers 7.2 × 4.8 m.
Angle of view on full frame (36 × 24 mm)
Focal length
Horizontal
Vertical
Diagonal
Frame at 10 m
14 mm
104.3°
81.2°
114.2°
25.7 × 17.1 m
24 mm
73.7°
53.1°
84.1°
15.0 × 10.0 m
35 mm
54.4°
37.8°
63.4°
10.3 × 6.9 m
50 mm
39.6°
27.0°
46.8°
7.2 × 4.8 m
85 mm
23.9°
16.1°
28.6°
4.2 × 2.8 m
135 mm
15.2°
10.2°
18.2°
2.7 × 1.8 m
200 mm
10.3°
6.9°
12.3°
1.8 × 1.2 m
400 mm
5.2°
3.4°
6.2°
0.9 × 0.6 m
Common sensor sizes and crop factors
Sensor
Size (mm)
Diagonal
Crop factor
Medium format 44 × 33
43.8 × 32.9
54.8 mm
0.79
Full frame
36 × 24
43.3 mm
1.0
APS-C (Nikon, Sony, Fuji)
23.5 × 15.6
28.2 mm
1.53
APS-C (Canon)
22.3 × 14.9
26.8 mm
1.61
Micro Four Thirds
17.3 × 13
21.6 mm
2.0
1-inch type
13.2 × 8.8
15.9 mm
2.73
1/2.3-inch
6.17 × 4.55
7.67 mm
5.64
Sensor dimensions vary slightly between camera models; check your camera's specifications for exact values and use the custom option.
Frequently asked questions
How do you calculate a camera's angle of view?
For a rectilinear lens focused at a distance, angle of view = 2 × atan(sensor dimension ÷ (2 × focal length)). Use the sensor width for the horizontal angle, the height for the vertical angle and the diagonal for the diagonal angle. A 50 mm lens on a 36 mm wide full-frame sensor gives 2 × atan(36 ÷ 100) ≈ 39.6° horizontally.
What is the difference between field of view and angle of view?
Angle of view is the angle the lens and sensor capture, in degrees. Field of view is often used for the same thing, but strictly it is the size of the scene covered at a given distance, for example 7.2 m wide at 10 m. This calculator shows both.
How wide is the frame at a given distance?
Frame width = distance × sensor width ÷ focal length, using the same unit for the sensor and focal length (mm). A full-frame camera with a 50 mm lens covers 10 × 36 ÷ 50 = 7.2 m across at 10 m.
What is crop factor?
Crop factor is the full-frame diagonal (about 43.27 mm) divided by your sensor's diagonal. APS-C is about 1.5 (1.6 for Canon) and Micro Four Thirds is 2. Multiply the focal length by the crop factor to get the full-frame focal length with the same angle of view.
Does the angle of view change when I focus closer?
Yes, slightly. Lenses usually get a little narrower when focused close because the lens moves away from the sensor (focus breathing varies by design). The calculator uses the standard infinity-focus formula, which is accurate for normal subject distances and less so in macro work.
Does this work for fisheye lenses?
No. Fisheye lenses use a different projection and capture much wider angles than the rectilinear formula predicts. Use the manufacturer's stated angle of view for fisheye lenses.
Which sensor size should I pick for my phone?
Phone main cameras are often around 1/1.3 inch to 1/1.7 inch, but sizes vary by model, and the focal length printed in specs is usually the 35 mm equivalent. If you only know the equivalent focal length, choose Full frame and enter that equivalent value.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.