Camera Field of View Calculator
Enter your camera sensor and lens settings to estimate horizontal, vertical, and diagonal field of view (FOV), plus scene coverage at a given distance.
What this FOV camera calculator does
Field of view (FOV) tells you how much of a scene your camera can capture with a specific lens and sensor size. A wider FOV shows more of the environment, while a narrower FOV gives a tighter composition. This calculator helps you estimate:
- Horizontal field of view
- Vertical field of view
- Diagonal field of view
- Approximate scene width/height captured at a chosen distance
- 35mm full-frame equivalent focal length
How FOV is calculated
Camera FOV depends on two inputs: the physical size of the sensor and the focal length of the lens. The core formula used is:
FOV = 2 × arctan(sensor dimension / (2 × focal length))
The calculator applies that formula separately for sensor width, sensor height, and sensor diagonal to provide horizontal, vertical, and diagonal FOV values.
How to use the calculator effectively
1) Choose a sensor preset
Start by selecting your camera format (Full Frame, APS-C, Micro Four Thirds, etc.). If your camera is unusual, pick Custom and enter your exact sensor dimensions.
2) Enter your lens focal length
Use the real focal length written on your lens (for example, 24mm, 35mm, 50mm, 85mm). For zoom lenses, use the specific focal length you plan to shoot at.
3) Add shooting distance
Distance is optional but useful. When included, the calculator estimates how wide and tall the framed scene will be at that distance.
Why sensor size matters
A 50mm lens does not look the same on every camera. Smaller sensors crop the image and reduce FOV compared with full frame. That is why many photographers reference crop factor and full-frame equivalent focal lengths when planning shots.
- Full frame crop factor: 1.0×
- APS-C crop factor: typically ~1.5× to 1.6×
- Micro Four Thirds crop factor: 2.0×
Practical shooting examples
Landscape photography
Wide-angle focal lengths (e.g., 14mm to 24mm on full frame) create expansive FOV and emphasize foreground depth.
Street and documentary
Mid-wide choices like 28mm or 35mm often balance context and subject scale while keeping composition natural.
Portraits
Longer focal lengths (85mm, 105mm) narrow FOV and simplify the background, which helps isolate people.
Common FOV planning mistakes
- Comparing focal lengths across different sensor sizes without crop factor
- Forgetting that focus distance and perspective affect composition choices
- Using diagonal FOV when horizontal framing is what actually matters for the scene
- Ignoring aspect ratio changes caused by video crop modes
Final thoughts
A field of view calculator is one of the fastest planning tools for photography, videography, and camera rig setup. By combining sensor size, focal length, and shooting distance, you can pre-visualize framing before you step on location.