Lens Focal Length Calculator
Determine the ideal lens size to achieve the perfect view of your target area at any distance.
* The target width defines how much area you want to see horizontally at the specified distance.
Pick a lens closest to this value. Higher mm = more zoom, lower mm = wider angle.
Frequently Asked Questions
How do you calculate lens focal length?
Focal length (mm) is calculated as: `(Distance to Target × Sensor Width) ÷ Target Width`. Knowing this formula ensures you choose a lens that covers the exact area of interest without capturing unnecessary empty space.
What is the difference between a wide-angle and a telephoto lens?
A lower focal length (like 2.8mm) provides a wide field of view (ideal for general monitoring), whereas a higher focal length (like 12mm or more) zooms in on distant subjects (ideal for license plate or facial recognition).
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