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Crop factor calculator

Convert focal length and aperture between sensor sizes, and see the angle of view a lens covers on full frame, APS-C, Micro Four Thirds and more.

All tools
23.5 × 15.6 mm, as on Nikon, Sony, Fujifilm. Crop factor 1.53×
f/2.8
Full-frame equivalent focal length
53.7 mm35 mm × 1.53
Depth-of-field equivalent aperture
f/4.3f/2.8 × 1.53. Exposure stays at f/2.8.
Horizontal angle of view
37.1°
Vertical angle of view
25.1°
Diagonal angle of view
43.9°
Sensor sizes drawn to scale. Full frame is 36 by 24 millimetres; the selected sensor is 23.5 by 15.6 millimetres.Full frame, 36 × 24 mm (dashed)Selected, 23.5 × 15.6 mm (filled)
Every sensor in the list to scale. The dashed outline is full frame; the filled one is your sensor.

How it works

The method behind the numbers.

Crop factor compares a sensor with full frame (36 × 24 mm). It is the ratio of the two diagonals, so a smaller sensor sees a narrower slice of the same lens image. To get that view on full frame you would need a longer lens, and to get the same depth of field and background blur you would need a larger f-number (a narrower aperture).

crop = 43.27 mm ÷ sensor diagonal equivalent f = f × crop equivalent N = N × crop angle of view = 2 × atan(d ÷ 2f)

d is the sensor width, height or diagonal, and f the focal length. The three angles are for the camera held in landscape orientation. The angle formula assumes the lens is focused at infinity; focused close, the real angle is narrower.

  • The equivalent aperture describes depth of field and background blur. It does not change exposure: f/2.8 on APS-C still meters like f/2.8 on full frame.
  • Sensor sizes are nominal figures. Makers differ by a few tenths of a millimetre, so the crop factor is close rather than exact.
  • Medium format is larger than full frame, so its crop factor is below 1 and the equivalents move the other way.
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