Crop Factor Calculator
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Crop factor and full-frame-equivalent focal length for your sensor size.
Sensor & lens
Crop factor
1.5×
35mm ≈ 53mm full-frame equivalent
- Full-frame equivalent focal length
- 53 mm
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Crop factor
Crop factor compares a sensor's diagonal size to a full-frame (35mm) sensor. A crop factor of 1.5, for example, means the sensor is 1.5 times smaller in linear dimensions than full frame, which effectively narrows the field of view of any lens you attach.
To compare lenses across formats, multiply the actual focal length by the crop factor to get the "full-frame equivalent" focal length — the focal length that would produce the same field of view on a full-frame camera. This does not change the lens's actual aperture or light-gathering ability, only its angle of view.
Example: a 35mm lens on an APS-C sensor (crop factor 1.5) has a full-frame-equivalent field of view of 35 × 1.5 = 52.5mm — noticeably narrower than 35mm would look on a full-frame body.
Common questions
Does crop factor change my lens's aperture?
No. The physical aperture and light-gathering stay the same — only the field of view (framing) changes. Depth of field is affected indirectly because of the different framing distance needed to match a shot.
Which sensor size has no crop factor?
Full-frame (35mm) sensors are the reference point, so their crop factor is always 1 — lenses show their true focal length's field of view.