Crop Factor Calculator

About this calculator

This calculator converts a lens's focal length and aperture to their 35mm (full-frame) equivalents using the camera's sensor crop factor — the ratio between a full-frame sensor's diagonal and the actual sensor's diagonal. For example, an APS-C sensor typically has a crop factor of 1.5 (Nikon, Sony) or 1.6 (Canon), while Micro Four Thirds sensors use 2.0.

Photographers use this to predict field of view and depth of field when switching between camera systems: a 50mm lens on an APS-C body frames a scene like a 75mm lens would on full frame. It also affects effective aperture for depth-of-field comparisons, which matters when choosing gear or comparing specs across brands. Enter the focal length, aperture, and sensor type to get the full-frame-equivalent values.