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Photography & video

Equivalent Focal Length Calculator

Find full-frame equivalent focal length using a crop factor.

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Camera and output settings

Runs on your device

SHOOTING ESTIMATE

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter actual focal length, crop factor.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Equivalent focal length = actual focal length × crop factor.

A WORKED EXAMPLE

Using actual focal length = 35 mm, crop factor = 1.5, the result is 52.5 mm. Change these example inputs to match your task; use the method above to check each step.

What to keep in mind

Compares angle of view; does not physically change the lens focal length. An ideal geometric or exposure estimate. Lens behavior, stabilization, sensor crop and scene conditions may change practical results.

Common questions

Which inputs does this calculation need?

Find full-frame equivalent focal length using a crop factor. Enter actual focal length in mm, crop factor. The filled example is editable and is not a saved personal record.

How should I interpret the result?

Compares angle of view; does not physically change the lens focal length. An ideal geometric or exposure estimate. Lens behavior, stabilization, sensor crop and scene conditions may change practical results.

Methodology maintained by ClarityKit. How these tools are built and checked.