Camera Field of View Calculator
Calculate horizontal, vertical, and diagonal FOV using focal length and sensor size. You can also estimate how much scene width and height fits in frame at a specific distance.
Tip: If you enter distance, the calculator also estimates scene coverage. If you enter desired framing width + distance, it estimates the focal length required.
What is camera field of view (FOV)?
Field of view is the angle of the scene your camera captures through a lens. A wide-angle lens shows a larger area, while a telephoto lens shows a narrower area. FOV depends on two things: focal length and sensor size.
That means a 35mm lens does not always look the same across all cameras. On full frame, it appears moderately wide. On APS-C or Micro Four Thirds, the same 35mm gives a tighter view because the sensor is smaller.
How this FOV calculator works
This page uses the standard geometric model:
- Horizontal FOV = 2 × arctan(sensor width ÷ (2 × focal length))
- Vertical FOV = 2 × arctan(sensor height ÷ (2 × focal length))
- Diagonal FOV uses sensor diagonal the same way
When distance is provided, the framing dimensions are calculated using trigonometry. This tells you how many meters of width and height you can fit at that distance.
Example
If you use a 24mm lens on full frame, horizontal FOV is roughly 73.7°. At 3 meters, you capture around 4.5 meters of scene width. If you swap to a 50mm lens from the same spot, the frame gets significantly tighter.
Why sensor size changes your framing
Smaller sensors crop the image circle, effectively narrowing your angle of view. This is why photographers talk about crop factor:
- Full Frame = 1.0×
- APS-C ≈ 1.5× (or 1.6× for Canon)
- Micro Four Thirds = 2.0×
A 25mm lens on Micro Four Thirds gives a similar framing to a 50mm lens on full frame, assuming the same camera position.
Horizontal vs vertical vs diagonal FOV
Most people think about width first, so horizontal FOV is common for landscape and real estate work. Vertical FOV matters for portraits, architecture, and social video. Diagonal FOV appears in many lens spec sheets, but it is less intuitive in practical composition.
Use the right dimension for your shot
- Interviews: vertical FOV helps ensure proper headroom.
- Rooms/interiors: horizontal FOV helps estimate wall-to-wall coverage.
- Product filming: both width and height matter for exact framing.
When to use a camera FOV calculator
- Planning lens rentals before a shoot
- Matching cameras with different sensor sizes
- Designing multi-camera setups
- Estimating tripod position in tight spaces
- Virtual production and previs
Practical tips for accurate results
1) Use real sensor dimensions
Manufacturer labels like “1-inch” do not equal literal one-inch width. Use exact active sensor area whenever possible.
2) Keep units consistent
This calculator expects focal length in millimeters and scene distance in meters. As long as distance and desired width use the same unit, focal length math remains correct.
3) Remember lens breathing and distortion
Real lenses can change angle of view slightly while focusing (focus breathing), and wide lenses may distort edges. So this is an accurate planning tool, but not a perfect optical simulation.
FAQ
Is this the same as crop factor calculator?
Related, but not identical. Crop factor compares framing relative to full frame. FOV gives you the actual viewing angle for your current lens and sensor combination.
Can I calculate focal length for a target framing width?
Yes. Enter desired framing width and distance, then click Calculate Required Focal Length. The tool estimates the focal length needed on your selected sensor.
Does this work for video and photography?
Yes. The geometry is the same. Just be aware that some video modes crop further (for example, 4K crop modes), which reduces FOV.