Camera calculator · free in CineMath
Field of View Calculator
Horizontal, vertical and diagonal angle of view, and frame coverage at any distance.
Field of View gives the angle a lens sees on a given sensor, and how wide and tall the frame is at a given distance. Enter the recorded area of the mode you shoot, not just the sensor's headline size, and turn on Anamorphic to widen the horizontal angle by the squeeze factor.
Worked examples
Worked examples
| Lens and sensor | Horizontal | Vertical | Diagonal | Frame at 3 m |
|---|---|---|---|---|
| 50 mm, full frame 36 × 24 mm | 39.6° | 27.0° | 46.8° | 2.16 × 1.44 m |
| 35 mm, Super 35 24.89 × 18.66 mm | 39.1° | 29.9° | 47.9° | 2.13 × 1.60 m |
| 25 mm, Micro Four Thirds 17.3 × 13 mm | 38.2° | 29.1° | 46.8° | 2.08 × 1.56 m |
Anamorphic
| Lens, squeeze and sensor | Horizontal | Vertical | Frame at distance |
|---|---|---|---|
| 50 mm 2×, Super 35 24.89 × 18.66 mm | 52.9° | 21.1° | 9.96 × 3.73 m at 10 m |
| 40 mm 1.5×, full frame 16:9 36 × 20.25 mm | 68.0° | 28.4° | 6.75 × 2.53 m at 5 m |
What you enter
- Focal length (mm), with presets 14, 24, 35, 50, 85 and 135
- Distance to the subject: meters, or feet when the app is set to Imperial, with presets from 1 to 50 m
- Sensor width (mm), with presets 36, 24.89, 23.6, 22.3, 17.3 and 13.2
- Sensor height (mm), with presets 24, 18.66, 15.6, 14.9, 13 and 8.8
- Anamorphic on or off, with squeeze presets 1.25, 1.33, 1.5, 1.8 and 2.0× or a custom factor
What you get
- Horizontal and vertical angle of view (degrees), with the diagonal angle as a detail row
- Frame width and height covered at the distance, in meters or feet
- The formula with your numbers in it
- A warning when the horizontal angle reaches 170°, where a rectilinear lens stops making sense
How CineMath works it out
- Angle = 2 × atan(sensor dimension ÷ (2 × focal length)), for width, height and diagonal
- Coverage = 2 × distance × tan(angle ÷ 2), which is the same as distance × sensor dimension ÷ focal length
- Anamorphic: the horizontal angle and frame width use sensor width × squeeze; the vertical angle, frame height and diagonal figure use the sensor as entered
- Uses the focal length as marked, which is exact at infinity focus; it does not model focus breathing, so close-up coverage runs slightly large
Guides
- Field of View Calculator GuideAngle of view by format, frame size at a distance, and the lens or distance for the frame you want.
- Cinema Camera Sensor Size ChartActive sensor area per recording mode for current cinema cameras, from the makers' own spec pages.
- Open Gate vs 16:9 vs AnamorphicHow recording modes and anamorphic squeeze change the horizontal and vertical field of view.
More Camera calculators
- Depth of FieldNear and far focus limits, hyperfocal distance, and the stop that holds two subjects in focus.
- Focal Length MatchFind the lens that gives the same horizontal view on a different sensor width.
- ExposureEnter a stop change and see the iris, shutter angle, ISO or ND that compensates for it.
- Close FocusMagnification, effective aperture and light loss for extension tubes; new close-focus distance for diopters.
- AnamorphicDesqueezed aspect ratio and horizontal-equivalent spherical focal length for any squeeze.