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Crop Factor Calculator

Equivalent focal length and aperture across sensor sizes, for matching field of view.

Enter values

Results update as you type.

Result

Full-frame equivalent focal length

52.5 mm

Crop factor changes the field of view and depth of field, but not the exposure — f/2.8 is f/2.8 on every sensor.

Equivalent aperture (for depth of field)
f/2.7
Crop factor
1.5 ×
Diagonal field of view
44.79 °
Focal length for a 50mm look
33.3 mm
Light gathering
f/1.8 — exposure is unchanged by the crop
Lens type
Standard

About the Crop Factor Calculator

Equivalent focal length and aperture across sensor sizes, for matching field of view.

Also known as: equivalent focal length, sensor crop calculator, full frame equivalent, 35mm equivalent.

How to use this calculator

  1. Enter sensor, focal length, aperture.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

equivalent focal length = focal length × crop factor

Worked example

Using the values pre-filled in the calculator above:

  • Sensor: APS-C Nikon/Sony (1.5×)
  • Focal length = 35 mm
  • Aperture = 1.8

the calculator returns:

  • Full-frame equivalent focal length: 52.5 mm
  • Equivalent aperture (for depth of field): f/2.7
  • Crop factor: 1.5 ×
  • Diagonal field of view: 44.79 °