Security Camera FOV Calculator
Plan CCTV coverage with this security camera field of view calculator. Enter sensor size, lens focal length, mounting height, and distance to see horizontal and vertical FOV plus coverage width at the subject plane. Use it to choose lenses that meet target width requirements for doorways, driveways, and parking areas.
Security Camera FOV Calculator
Results
Enter Lens, Distance, and Sensor Details
Security cameras use small sensors—often 1/3-inch or 1/2.8-inch formats—with focal lengths between 2.8mm and 12mm. Enter the actual sensor width from the datasheet when possible; default values here approximate common 1/3-inch chips.
Camera-to-subject distance sets where coverage width is measured. Mounting height affects vertical coverage on the ground plane, especially for wide-angle lenses overlooking large areas.
CCTV Coverage Width and Height
Coverage width at distance is the horizontal span your camera sees at a chosen range—critical for identifying faces versus general area monitoring. A cctv field of view calculator converts lens angle into meters or feet of width so you can verify a doorway or lane fits inside the frame.
Depth of view and vertical coverage depend on mounting angle and lens FOV. Tilt a wide camera down and near-field width shrinks while far-field expands, so always model the distance where identification matters most.
Wide Angle vs Narrow Angle Security Cameras
Wide-angle lenses above 90° horizontal fit small rooms and short driveways but sacrifice detail at distance. Narrow lenses below 40° magnify distant subjects for license-plate capture but leave blind spots nearby. cctv fov planning balances pixel density with area covered.
Varifocal lenses let installers tune security camera fov on site. Use this calculator before purchase to know whether a 3.6mm or 6mm lens hits your target width at the identification distance.
Doorbell and Outdoor Camera Examples
Video doorbells like Nest Hello advertise roughly 160° diagonal field of view—about 90° horizontal and 120° vertical depending on sensor crop. Compare nest camera field of view specs against your porch depth to ensure packages and faces both fall inside adequate pixel density.
Wyze camera field of view varies by model; outdoor v3 units are near 121° diagonal. Treat manufacturer numbers as marketing diagonal FOV and verify horizontal coverage here before relying on a single wide-angle lens for perimeter security.
Placement Tips Based on FOV
Mount cameras high enough to clear obstacles but not so steep that horizon compression wastes pixels. Overlap adjacent cameras by 10–15% of horizontal FOV when seamless tracking matters. For choke points like gates, prioritize identification distance over maximizing width.
Pair results with the camera field of view calculator when comparing DSLR lenses to dedicated CCTV sensors, especially if you are prototyping with interchangeable-lens boxes.
Frequently Asked Questions
Choose FOV based on coverage goals. Entry monitoring often uses 80–110° horizontal to cover porches and doors. Long driveways may need 30–60° lenses for detail at 20+ meters. Match FOV to target width at identification distance rather than defaulting to the widest lens.
Distance depends on resolution, lens FOV, and lighting—not FOV alone. Wide FOV sees a large area nearby but limits facial detail far away. Narrow FOV reaches farther with fewer pixels across the scene. Use this calculator for coverage width, then check pixel density for your recorder.
Nest Hello doorbell camera lists approximately 160° diagonal FOV. Wired outdoor Nest cams are narrower, often around 130° diagonal. Enter equivalent sensor and focal length here to model horizontal coverage at your walkway distance.
Enter target coverage width and camera distance; the calculator suggests a focal length for your sensor. Shorter focal length widens coverage; longer focal length tightens the view. Validate with a varifocal lens on site if exact identification distance varies.