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Useful Installer Tools · CCTV

CCTV Lens & Coverage Calculator

Estimate CCTV camera field of view from focal length, image-sensor size and installation distance. The tool calculates horizontal and vertical viewing angle, scene width and height, diagonal scene coverage and approximate pixels per metre for the selected camera resolution.

Camera setup

Use the camera datasheet where possible. Lens size and image-sensor dimensions both affect the real viewing angle.

Planning note: This is a geometric estimate. Real camera datasheets may quote a different FOV because of lens distortion, cropping, digital correction and the manufacturer's actual sensor active area.

Estimated coverage

Horizontal FOV—Viewing angle from left to right.
Vertical FOV—Viewing angle from top to bottom.
Scene width—Approximate width visible at the selected distance.
Scene height—Approximate height visible at the selected distance.
Scene diagonal—Diagonal dimension of the visible rectangle.
Horizontal PPM—Approximate horizontal pixels per metre.
Calculate to preview coverage
Pixels-per-metre will appear here after calculation. Use it as a planning indicator, not as a legal identification guarantee.
How to use it

Choose coverage before you drill the camera bracket.

Use the calculator during survey/planning, then verify the actual view from the installed camera.

01Choose the actual lensUse the focal length printed on the camera or datasheet: 2.8mm, 3.6mm, 6mm, etc.
02Choose the sensorSensor size matters. Use the camera specification where available instead of guessing.
03Measure target distanceMeasure from the camera position to the main area/person/gate you want to cover.
04Read scene widthThis tells you roughly how wide the picture will be at that distance.
05Compare lens optionsShorter lenses normally give wider coverage; longer lenses narrow the view and show more detail on a smaller area.
06Watch PPMHigher pixels-per-metre usually means more image detail across each metre of the scene.
07Check mounting heightThis calculator is a straight geometric view. Camera tilt and mounting height change what part of the scene actually lands in frame.
08Verify on the monitorAfter installation, use the live camera image to fine-tune angle, zoom and position.
09Avoid blind spotsCalculate key gates/doors separately if one very wide camera view would make important subjects too small.