Crop Factor Calculator
Calculate equivalent focal length with crop factor
About this calculator
A crop factor calculator helps photographers determine the equivalent focal length of a lens when used on cameras with different sensor sizes. This tool is essential for understanding how your lens will perform on crop sensor cameras compared to full-frame cameras. By calculating the effective focal length, you can better predict field of view, composition, and lens selection for different camera systems, making it invaluable for equipment planning and photography technique optimization.
How to use
Enter your lens's actual focal length in millimeters and your camera's crop factor (typically 1.5x for APS-C or 2x for Micro Four Thirds). The calculator will instantly display the equivalent focal length as it would appear on a full-frame camera, helping you understand the effective field of view.
Frequently asked questions
What is crop factor?
Crop factor is the ratio between a full-frame sensor and smaller sensors, indicating how much the field of view is 'cropped' or narrowed compared to full-frame cameras.
Why does crop factor matter?
Crop factor affects field of view and depth of field characteristics, helping photographers understand how lenses will perform on different camera sensor sizes for better shot planning.
What are common crop factors?
APS-C sensors typically have 1.5x-1.6x crop factor, Micro Four Thirds has 2x, while full-frame sensors have 1x crop factor by definition.