Crop factor is the ratio of a full-frame sensor diagonal (43.27 mm for 36×24 mm) to your sensor diagonal. A crop factor of 1.5× means your sensor is 1.5 times smaller diagonally than full frame, so a lens appears to have 1.5× the focal length.

Does crop factor affect depth of field?

Yes. To match the same field of view and depth of field as a full-frame camera, you need to open the aperture by the same crop factor. For example, f/2.8 on APS-C (1.5×) is equivalent to roughly f/4.2 on full frame.

What is the crop factor for Canon APS-C vs Nikon APS-C?

Canon APS-C sensors measure approximately 22.3×14.9 mm, giving a crop factor of about 1.61×. Nikon, Sony, and Pentax APS-C sensors are larger at roughly 23.5×15.6 mm, giving about 1.52×.

What crop factor does Micro Four Thirds use?

Micro Four Thirds sensors are 17.3×13 mm, producing a crop factor of approximately 2×. A 25 mm lens on MFT behaves like a 50 mm lens on full frame.

How is field of view calculated?

Diagonal field of view = 2 × arctan(sensor diagonal / (2 × focal length)). This calculator uses your equivalent focal length against the full-frame 43.27 mm diagonal to give the true diagonal angle of view.

Crop Factor Calculator

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.

Sensor & Lens Settings

Sensor preset

Sensor width (mm)

Sensor height (mm)

Lens focal length (mm)

Results

Enter sensor dimensions and focal length, then click Calculate.

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Summary

This tool computes the crop factor of any digital camera sensor by comparing its diagonal to the 36×24 mm full-frame standard. Enter your sensor dimensions (or choose a common preset) and a lens focal length to instantly see the full-frame equivalent focal length and the resulting diagonal field-of-view angle.

How it works

Select a sensor preset (APS-C Canon, APS-C Nikon/Sony, Micro Four Thirds, 1-inch) or enter custom width and height in millimeters.
The crop factor is calculated as the diagonal of a full-frame sensor (43.27 mm) divided by the diagonal of your sensor.
Enter your lens focal length in millimeters.
The full-frame equivalent focal length is your focal length multiplied by the crop factor.
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

Last updated: 2026-06-13 · Reviewed by Nham Vu