Calculate the horizontal, vertical, and diagonal field of view for any camera sensor and lens focal length combination. Plan surveillance coverage.
The field of view (FOV) of a camera determines how much of a scene is captured in a single frame. It depends on two physical factors: the focal length of the lens and the size of the image sensor. A shorter focal length or a larger sensor produces a wider field of view, while a longer focal length or smaller sensor narrows it.
Understanding FOV is essential for photographers choosing lenses, security professionals designing surveillance layouts, and filmmakers planning shots. A 50mm lens on a full-frame sensor gives a roughly 46-degree horizontal FOV—close to natural human vision—while the same lens on an APS-C sensor gives only about 31 degrees due to the crop factor.
This calculator computes horizontal, vertical, and diagonal angles of view, plus the physical coverage dimensions at any specified distance. Whether you're positioning security cameras to cover a parking lot, selecting a lens for landscape photography, or designing a multi-camera studio setup, accurate FOV calculations ensure complete coverage without wasteful overlap.
The tool supports common sensor formats from 1/4-inch action cameras to medium-format sensors, and lets you enter custom sensor dimensions for specialized equipment. Compare multiple lens and sensor combinations to find the optimal setup for your specific application.
Accurately calculating camera field of view prevents costly mistakes in surveillance installation, lens purchases, and film production. This calculator eliminates guesswork by providing precise angles and physical coverage dimensions for any camera setup. Keep these notes focused on your operational context. Tie the context to the calculator’s intended domain. Use this clarification to avoid ambiguous interpretation.
FOV = 2 × arctan(sensor_dimension / (2 × focal_length)). Coverage width at distance d = 2 × d × tan(FOV_horizontal / 2). Where sensor_dimension is the width, height, or diagonal of the sensor.
Result: 39.6° horizontal FOV
A 50mm lens on a full-frame sensor (36×24mm) yields a 39.6° horizontal FOV. At 10 meters distance, this covers 7.2 meters horizontally.
Camera sensors come in many sizes, from the tiny 1/4-inch sensors in smartphones (3.6×2.7mm) to medium format (44×33mm or larger). The sensor size directly affects both field of view and image quality. Full-frame sensors (36×24mm) remain the professional standard, offering a good balance between FOV, depth of field control, and low-light performance.
APS-C sensors (approximately 23×15mm) are the most common in enthusiast cameras, with a crop factor of 1.5x (Nikon/Sony) to 1.6x (Canon). This means a 35mm lens on APS-C gives a similar FOV to a 50mm on full-frame.
When designing a CCTV system, FOV calculations determine optimal camera placement and quantity. For a 20-meter-wide parking lot monitored from 15 meters away, you need a horizontal FOV of about 67°. A 4mm lens on a 1/2.7-inch sensor provides roughly 80°, giving adequate coverage with some margin.
Multi-camera setups require careful FOV mapping to ensure complete coverage. Create an overhead diagram with FOV cones from each camera position, targeting 15–20% overlap at the edges.
Filmmakers use FOV to create specific visual effects. Wide-angle lenses (short focal length, wide FOV) exaggerate depth and convey expansive environments or unease. Telephoto lenses (long focal length, narrow FOV) compress depth and isolate subjects. Understanding the precise FOV for each lens-sensor combination helps cinematographers previsualize shots and communicate with their team accurately.
They're often used interchangeably. Technically, angle of view refers to the lens property, while field of view describes the coverage at a specific distance.
A smaller sensor "crops" the image circle, effectively narrowing the FOV. An APS-C sensor with 1.5x crop factor makes a 50mm lens behave like a 75mm lens on full-frame in terms of FOV.
Larger sensors give wider FOV for the same focal length. Medium format > Full frame > APS-C > Micro Four Thirds > 1-inch.
Plan for 15–20% overlap between adjacent cameras. Use this calculator to determine exact coverage at your mounting distance, then space cameras accordingly.
For most practical purposes, no. FOV changes with focus distance are negligible except in extreme macro photography.
Wide-angle lenses (90–120° FOV) work well for general area monitoring. Narrower FOV (30–60°) suits specific areas like entrances or hallways.