Crop Factor Calculator
Find the equivalent focal length on any sensor: full frame, APS-C, MFT and more
Crop factor converts your lens focal length to its full-frame equivalent, so you can compare lenses across sensors. A 35mm lens on an APS-C camera (1.5 crop) behaves like roughly 53mm. Enter your sensor and focal length for your actual field of view.
Common focal lengths on your sensor
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Crop Factor Calculator: how it works
The crop factor calculator converts any focal length to its full-frame equivalent, or the other way around. Use it when you're comparing lenses across different camera systems, or when you want to know what angle of view a lens gives on a specific sensor. Enter your sensor format and focal length, and you get the equivalent straight away.
What crop factor actually means for your images
Every sensor captures a different portion of the image circle projected by a lens. A Nikon or Sony APS-C sensor has a crop factor of 1.5, Canon APS-C sits at 1.6, and Micro Four Thirds at 2.0. A 35mm lens on an APS-C body frames like a 52mm on full frame: a slightly narrower field of view, closer to a standard perspective.
Crop factor also affects apparent depth of field. At the same aperture and equivalent focal length, a smaller sensor produces a deeper depth of field than full frame. If you're shooting on MFT and want thin focus, you need to factor that in when choosing a lens.
Comparing lenses when switching systems
If you're moving from one system to another, or just trying to match a familiar focal length in a new mount, the full-frame equivalent is your reference point. Calculate the equivalent for both lenses and you know exactly how they compare in terms of angle of view.
The calculator covers the most common sensor formats: full frame (1.0), APS-C Nikon/Sony/Fuji (1.5), APS-C Canon (1.6), Micro Four Thirds (2.0) and smaller compact sensors. If you're unsure about your camera's crop factor, check the spec sheet for your body.
Frequently asked questions
What is the full-frame equivalent of a 50mm lens on APS-C?
On an APS-C body with a 1.5x crop factor, a 50mm lens behaves like a 75mm on full frame. On Canon APS-C with a 1.6x factor, that becomes 80mm.
Does crop factor change the effective aperture of my lens?
It does not change your exposure, but it does affect the equivalent depth of field. An f/1.8 lens on MFT gives roughly the same depth of field as f/3.5 on full frame at the same equivalent focal length.
How do I find the native focal length I need on MFT to match my 85mm full-frame portrait lens?
Divide the full-frame focal length by the crop factor: 85mm divided by 2.0 gives 42.5mm. A 42mm or 45mm lens on MFT will give you a very similar angle of view.