Crop Factor Calculator

Summary

Enter your sensor dimensions (or pick a preset) to get its crop factor, then input your lens focal length to see the full-frame equivalent and field-of-view angle.

How it works

1. Select a sensor preset (APS-C Canon, APS-C Nikon/Sony, Micro Four Thirds, 1-inch) or enter custom width and height in millimeters.
2. The crop factor is calculated as the diagonal of a full-frame sensor (43.27 mm) divided by the diagonal of your sensor.
3. Enter your lens focal length in millimeters.
4. The full-frame equivalent focal length is your focal length multiplied by the crop factor.
5. The diagonal field-of-view angle is derived from the equivalent focal length using the standard arctan formula.

Use cases

• Determine how a legacy lens behaves on a crop-sensor camera body.
• Find the native focal length needed to match a desired full-frame field of view.
• Compare field-of-view angles across different sensor formats.
• Plan portrait or landscape shots by knowing the true angle of view before a shoot.
• Evaluate whether a lens purchased for a full-frame body is usable on a crop body.
• Understand why a 50 mm lens on Micro Four Thirds behaves like a 100 mm telephoto.

Frequently Asked Questions