You can’t avoid crop factor these days. Whether your camera sports an APS-C, Micro Four Thirds, 1-inch, or some other size sensor, there will come a time when you’ll have to calculate a “full-frame equivalent” and that’s when the mmCalc Crop Factor Calculator will come in very handy.
mmCalc is a simple online tool that uses your sensor size to instantly convert any focal length and aperture f-stop into its 35mm equivalent.
Whether you’re using a Canon APS-C camera (crop factor 1.6) a Nikon APS-C camera (crop factor 1.5), an old Nikon 1 with a 1-inch sensor (2.7x crop factor), or something completely wacky, chances are the mmCalc calculator has you covered. You can even convert down from medium and large format, although the auto-fill bit under “Education” falls apart once the sensor gets bigger than full-frame.