Calculadora de Fator de Corte (Crop Factor)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
crop = 43,27 / diagonal_sensor
About this calculator
The Crop Factor Calculator is a tool for photographers and videomakers who need to compare lenses across different sensor sizes. It calculates the crop factor from the sensor diagonal entered by the user, using the full-frame sensor (36 mm x 24 mm, diagonal 43.27 mm) as reference. The result indicates how much the field of view of a lens will be reduced compared to full-frame.
The calculation is simple: divide the full-frame diagonal (43.27 mm) by the entered sensor diagonal. For example, a Canon APS-C sensor has a diagonal of approximately 26.82 mm, resulting in a crop factor of 1.61x. This means a 50 mm lens will have a field of view equivalent to an 80 mm lens on full-frame. The calculator is useful for choosing lenses, understanding equivalences, and planning compositions.
Use this calculator when buying lenses for cameras with sensors different from full-frame, such as APS-C, Micro Four Thirds, or medium format. It helps predict the angle of view and equivalent focal length. Caution: crop factor does not change aperture or depth of field in terms of exposure, but it affects apparent depth of field due to shooting distance.
Note that some manufacturers may use slightly different diagonals for their sensors. The formula assumes an ideal full-frame sensor. For sensors with a different aspect ratio than 3:2, the calculation is still valid, but the exact equivalence may vary. Always check manufacturer specifications for greater accuracy.
Frequently asked questions
What is crop factor and what is it used for?
Crop factor is the ratio between the diagonal of a full-frame sensor and the diagonal of your camera's sensor. It is used to compare the field of view of lenses across cameras with different sensor sizes.
How to calculate crop factor manually?
Divide 43.27 mm (full-frame diagonal) by your sensor's diagonal in millimeters. For example, if the diagonal is 26.82 mm, the crop factor is 43.27 / 26.82 = 1.61.
Does crop factor affect lens aperture?
No. Crop factor does not change aperture or exposure. It only affects the equivalent field of view and apparent depth of field due to shooting distance.
What is the crop factor of a Canon APS-C sensor?
The Canon APS-C sensor is approximately 22.3 mm x 14.9 mm, with a diagonal of 26.82 mm, resulting in a crop factor of 1.61x.
Can I use the calculator for smartphone sensors?
Yes, as long as you know the diagonal of the phone's sensor. The calculation is the same, but phones typically have very small sensors, resulting in high crop factors (e.g., 5x or more).