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# Crop factor calculator

Converts focal length and aperture to full-frame equivalents for a chosen sensor and compares two camera setups with angles of view.

Enter a sensor size and a focal length to see the equivalents.

The arithmetic is all here: crop = 43.2666 / sqrt(width² + height²), full frame diagonal in millimetres; equivalent focal = real focal × crop; equivalent f-number = f × crop, which holds both for depth of field and for total light; angle of view = 2 × atan(side / (2 × focal)). Aperture equivalence assumes the same subject and print size; it says nothing about noise, resolution, or stabilisation, and the light-stops figure is an area ratio, not a measurement of any lens. Computed in this tab, nothing uploaded.
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## More unit & math tools

- [Aspect ratio and DPI](/converters/aspect-ratio)
- [Unit converter](/converters/units)
- [Fraction calculator](/converters/fractions)
[All unit & math tools](/converters)

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