mmCalc is a 35mm lens equivalent and crop factor calculator. Simply input your lenses focal length, the size of your sensor, and what the maximum aperture of your lens is and we will give you what the lens would be in terms of 35mm. mmCalc also provides a crop factor calculator that allows you to input the dimensions of your sensor and find out what the exact crop factor is. If you're unable to calculate for your lens with the pre-defined values, we also provide a completely customizable calculator that allows you to input your own crop factor, aperture, focal length, and even sensor dimensions.

We also provide calculations for medium and large format sensors.

If you have any questions, comments, or concerns, you can reach me directly at contact@joescotto.com or use the contact form.