Crop Factor Calculator
A crop sensor sees a tighter slice of the scene than a full frame sensor, so a lens behaves like a longer one when mounted on it. This calculator converts any focal length into its full frame equivalent using the crop factor of your camera, which is how photographers compare framing across different systems. Enter a focal length and choose your sensor, or type a custom crop factor, and you get the equivalent focal length plus the effective aperture, since the crop factor also affects depth of field. A 50mm lens on an APS-C body with a 1.5x factor frames like a 75mm lens on full frame. Understanding this helps you pick the right lens for a portrait, a landscape, or wildlife on any camera. Everything is computed locally in your browser with nothing sent to a server.
How to use Crop Factor Calculator
- Enter your lens focal length.
- Select your sensor format or crop factor.
- Read the full frame equivalent focal length.
- Compare it against other formats to plan lens choices.
Frequently asked questions
What does crop factor do?
It converts a lens actual focal length to its full frame equivalent by multiplying by the sensor crop factor, so you can compare angle of view across camera formats.
What crop factors are common?
Full frame is 1.0, APS-C is roughly 1.5 or 1.6, and Micro Four Thirds is 2.0, so a 25 mm lens on Micro Four Thirds frames like a 50 mm on full frame.
Does crop factor change the actual focal length?
No, the physical focal length is fixed; crop factor only tells you the equivalent field of view relative to full frame.
What is Crop Factor Calculator?
A crop sensor sees a tighter slice of the scene than a full frame sensor, so a lens behaves like a longer one when mounted on it. This calculator converts any focal length into its full frame equivalent using the crop factor of your camera, which is how photographers compare framing across different systems.
Is Crop Factor Calculator free to use?
Yes. Crop Factor Calculator is completely free, with no sign-up and no usage limits.
Does Crop Factor Calculator work in a web browser?
Yes. Crop Factor Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Crop Factor Calculator?
Yes. Crop Factor Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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