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Calixo

Camera Field of View Calculator

Find a camera's horizontal field of view from its sensor width and lens focal length.

Inputs

E.g. 6.4mm for a common 1/2.7" CCTV sensor.

Saved Scenarios

— select 2+ to compare

Horizontal Field of View (°)

77.3

Spark says

Formula

FOV=2×arctan⁡(Sensor Width2×Focal Length)FOV = 2 \times \arctan\left(\dfrac{Sensor\ Width}{2 \times Focal\ Length}\right)
Sensor\ Width
— Physical width of the camera's image sensor

What is the Camera Field of View Calculator?

A lens's field of view depends on both its focal length and the camera sensor's physical size — the same focal length gives a different FOV on different sensor sizes, which is why this calculator needs both.

How to use it

  1. 1 Enter the camera sensor's physical width in millimeters (check the camera's datasheet).
  2. 2 Enter the lens focal length in millimeters.

Worked examples

6.4mm sensor, 4mm lens

About 77.3° horizontal FOV — a wide-angle view.

Try it

Limitations

  • •Calculates the horizontal FOV along the sensor's width only — vertical and diagonal FOV differ and depend on the sensor's aspect ratio.

Frequently asked questions

Why does a shorter focal length give a wider FOV?

A shorter focal length bends light more sharply onto the sensor, capturing a wider angle of the scene — this is the basic trade-off between wide-angle and telephoto lenses.