Camera Field of View Calculator
Estimate horizontal, vertical, and diagonal field of view from your camera sensor and lens settings. You can also calculate how much scene width and height will be visible at a specific distance.
What is field of view in photography and video?
Field of view (FOV) is the amount of the scene your camera captures through a lens. A wider field of view includes more of the environment, while a narrower field of view captures a tighter, more zoomed-in framing. FOV depends mainly on two things: sensor size and focal length.
If you keep the same lens and switch from a full-frame camera to APS-C, your field of view gets narrower. If you keep the same camera and change from a 24mm lens to an 85mm lens, your field of view narrows dramatically.
How this calculator works
This tool uses standard camera geometry formulas to estimate angles of view and framing dimensions at a chosen distance. It calculates:
- Horizontal FOV – angle across the width of your image.
- Vertical FOV – angle from top to bottom.
- Diagonal FOV – angle corner-to-corner.
- Scene Width/Height – how much real-world area is visible at your subject distance.
Core formula
For each dimension (width, height, or diagonal), the angle of view is calculated as:
FOV = 2 × arctan(sensor_dimension / (2 × focal_length))
Then scene size at distance is estimated by:
Scene size = 2 × distance × tan(FOV / 2)
Why this matters in real projects
1) Portrait photography
Knowing your field of view helps you choose whether a lens gives a full-body portrait, half-body framing, or a tight headshot at a practical distance. It saves trial-and-error when working in small indoor spaces.
2) Real estate and architecture
Interior shooters need to know whether a room fits in frame before selecting a lens. A wider FOV can capture full rooms, but may introduce perspective distortion. Calculating first helps balance coverage and natural proportions.
3) Video production and interviews
For multi-camera setups, FOV planning ensures consistent shot sizes and avoids awkward composition mismatches between cameras. It also helps with lens swaps during run-and-gun filming.
4) Security and surveillance
For CCTV and monitoring systems, you can estimate how wide an area each camera covers at a fixed mounting distance. This is useful for minimizing blind spots and selecting lens focal lengths efficiently.
Tips for accurate results
- Use your camera's real sensor dimensions if possible (not just crop factor labels).
- Double-check focal length if using zoom lenses; small changes can significantly affect framing.
- Measure subject distance from the camera sensor plane for best accuracy.
- Remember lens distortion can alter perceived framing, especially with ultra-wide lenses.
- Use this as a planning guide, then fine-tune with test shots on location.
Common sensor references
Typical sensor sizes often used in FOV discussions include:
- Full Frame: 36 x 24 mm
- APS-C: about 23.6 x 15.7 mm (varies by brand)
- Micro Four Thirds: 17.3 x 13.0 mm
- 1-inch: 13.2 x 8.8 mm
- Many phones: smaller than 1-inch, often around 6-8 mm wide
Frequently asked questions
Does this calculator include lens distortion?
No. It uses ideal geometric projection. Real lenses may show barrel or pincushion distortion, which can slightly change edge framing.
Is crop factor the same as changing focal length?
Not physically. Focal length is an optical property of the lens. Crop factor changes how much of the lens image circle is captured by the sensor, resulting in a different field of view.
Can I use feet instead of meters?
Yes. Set distance units to feet and the scene coverage values are displayed in feet as well.
Final thoughts
A field of view calculator is one of the fastest ways to plan shots before stepping on set or location. Whether you are composing portraits, evaluating CCTV coverage, choosing vlogging lenses, or planning cinematic scenes, understanding FOV helps you work faster and avoid costly surprises.