Crop Factor Calculator

How it works

Crop factor = full-frame diagonal (43.27 mm) ÷ sensor diagonal. Multiply focal length and f-number by it to find the full-frame lens that gives the same field of view and depth of field. The lens still lets in the same light per area, so the equivalent aperture does not change exposure. Common values: APS-C about 1.5, Micro Four Thirds 2.0. Example: A 23.5 × 15.6 mm sensor has a crop factor of 1.53, so a 35 mm f/1.8 lens behaves like a 53.7 mm f/2.8 lens on full frame.

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