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Crop Factor Equivalent Calculator

Enter your focal length, crop factor and aperture to see the 35mm equivalent.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

A camera's crop factor is the ratio between a full-frame (35mm) sensor's diagonal and a smaller sensor's diagonal — roughly 1.5x for APS-C, 2x for Micro Four Thirds. Multiplying a lens's focal length by the crop factor gives its 35mm-equivalent field of view.

Multiplying the aperture by the same factor gives the equivalent depth-of-field and light-gathering comparison, letting photographers judge two lenses on different sensor systems on common ground. This calculator is used by photographers choosing lenses, comparing gear across brands, or moving between a crop-sensor and a full-frame camera body and needing to know what focal length will “feel” the same.

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