CALCULATOR / OPTICS
Camera Field of View Calculator: Lens, Sensor and Scene Width
Use this camera field of view calculator to estimate horizontal and vertical view from sensor dimensions and focal length, then inspect scene span before testing the actual lens and installation.
INTERACTIVE PLANNING TOOL
HORIZONTAL VIEW
77.3°
Approx. scene width at distance: 16 m
VERTICAL VIEW
48.5°
Approx. scene height at distance: 9 m
Geometry aid only: 2 × atan(sensor dimension ÷ (2 × focal length)). Real cameras can crop, distort, stabilize, refocus, and change usable detail with light, angle, movement, and image settings.
Use the lens and sensor together
The simple angle estimate uses 2 × atan(sensor dimension ÷ (2 × focal length)). Enter the sensor width and height in millimetres and the lens focal length in millimetres. A larger focal length narrows the view; a larger sensor dimension widens it for the same lens.
Translate angle into scene width
At a chosen working distance, approximate scene span with 2 × distance × tan(field-of-view angle ÷ 2). This is a geometry aid for planning, not a promise that a person, plate, or object will contain enough usable pixels.
Use the target distance along the optical axis and keep the unit consistent. The tool reports horizontal and vertical span independently so a designer can compare a doorway or corridor with the intended framing.
Check the real installation
Lens distortion, crop mode, aspect ratio, mounting angle, digital stabilization, focus, scene obstruction, lighting, movement, and privacy masks can change the usable view. Confirm the actual camera model, sensor mode, lens, target distance, and image task during a site test.
FIELD CHECKLIST
Record the result, not only the intention
- Confirm sensor dimensions and focal length from current device documentation.
- Enter the measured working distance to the target zone.
- Compare horizontal and vertical span with the required scene task.
- Check mounting angle, distortion, crop, light, movement, and obstructions.
- Validate usable detail and blind spots at the real installation.
FAQ / LONG-TAIL QUESTIONS
Frequently asked questions
What does a CCTV lens calculator estimate?
It estimates horizontal and vertical view from sensor dimensions and focal length, then translates the angle into approximate scene span at a selected distance.
How does an IP camera coverage calculator help placement?
It provides a geometry starting point for comparing lens and distance assumptions. Validate target detail, height, angle, lighting, movement, distortion, and blind spots at the real site.
How do you calculate horizontal field of view?
Use the sensor dimension and focal length in the geometry equation, then test the selected lens and camera position because real optics, cropping, focus, and installation conditions change usable coverage.