Security Camera Coverage Overlap & Spacing Calculator

Plan how multiple cameras share a wall, fence line, driveway, lot edge or other target plane. The calculator converts field of view and distance into scene width, then shows camera spacing, overlap, total coverage and the minimum camera count needed for the width you want to cover.

What the calculator is modeling

The tool assumes each camera is aimed at the same target plane from roughly the same distance with the same horizontal field of view. Scene width is 2 × distance × tan(horizontal FOV ÷ 2). Planned camera spacing is scene width × (1 − overlap fraction).

Why overlap matters

Zero-overlap layouts can create fragile seams: a small aiming error, lens distortion, an obstruction or an irregular property line can turn the theoretical boundary between two images into a blind strip. Some planned overlap gives you tolerance, but excessive overlap wastes pixels and camera channels by recording too much of the same area.

There is no universal overlap percentage

The overlap field is deliberately user-selected. The right value depends on geometry, lens distortion, obstructions, evidence goals and how accurately the cameras can be aimed. Treat the result as a first-pass layout, then verify the actual images after installation.

Spacing is measured at the target plane

The calculated spacing is not necessarily the physical distance between camera housings on the wall. It represents how far apart the camera centerlines land across the target plane. Cameras mounted on corners, angled walls or different distances need a site-specific plan.

Use it with the other placement tools

First check each camera's individual scene width with the Coverage & Focal Length Calculator. Then use the Mounting Height & Tilt Calculator to verify vertical geometry.

Related guides: how much camera overlap to plan · how far apart to space security cameras.