Crop Factor Calculator

Your details

Forward: you have a lens on a crop sensor and want to know the 35mm equivalent. Reverse: you want a specific 35mm-equivalent look and need to know what lens to use.
Select your camera sensor format. Choose Custom to enter exact dimensions.
The actual focal length printed on your lens.
mm
The f-stop you are shooting at. Used to calculate the depth-of-field equivalent aperture on a full-frame camera.
f/
Multiplier for a teleconverter (e.g. 1.4) or focal reducer/speed booster (e.g. 0.71). Set to 1 if not using one.
Crop FactorAPS-C
1.53

Ratio of full-frame diagonal to this sensor diagonal

35mm Equivalent Focal Length53.7mm
Equivalent Aperture2.8f/
Sensor Diagonal28.21mm
Sensor Area366.6mm2
1.53 x
Medium Format<0.9Full Frame0.9-1.05APS-C1.05-1.65Micro Four Thirds1.65-2.11-inch2.1-2.8Small Sensor2.8+

Crop factor: 1.53x

  • With a 1.53x crop factor, your sensor captures a narrower field of view than a full-frame camera using the same lens.
  • Your 35mm f/1.8 lens behaves like a 53.7mm f/2.8 lens on a full-frame camera in terms of field of view and depth of field.
  • The narrower field of view can work in your favour for wildlife or sports (more reach), but makes wide-angle photography harder.
  • Crop factor affects field of view and depth of field equivalence but not the optical quality or the actual f-stop light gathering of the lens.

Next stepIf you are buying a wide-angle lens for a crop sensor, look for lenses designed specifically for that format (often labelled DX, EF-S, or MFT) since full-frame wide lenses rarely cover enough image circle at those short focal lengths.

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