Lens Equivalent Calculator

Convert focal lengths between camera sensor sizes. Find the equivalent field of view and crop factor when switching between camera systems.

Focal Length

Source Sensor (lens is on)

Target Sensor (convert to)

Tab to move between fields

Equivalent Focal Length

25 mm

Conversion Factor

Full-Frame Equivalent50 mm

Source Crop Factor1

Target Crop Factor2

Field of View (source)46.8°

Field of View (target)46.8°

Lens Category (FF equiv)Normal / Standard

How to Use This Calculator

Enter Focal Length, Source Sensor (lens is on), and Full Frame (36x24mm).
Set APS-C Canon (22.3x14.9mm), APS-C Nikon/Sony (23.5x15.6mm), and Micro Four Thirds (17.3x13mm).
Adjust 1-inch (13.2x8.8mm), 1/2.3-inch (6.17x4.55mm) as needed.
Review Equivalent Focal Length (mm) and Conversion Factor.
Use Full-Frame Equivalent (mm) and Source Crop Factor to inform your decision.

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