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Photography Calculators

35mm Equivalent Focal Length Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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Verified formula Private

35mm equivalent focal length

80.0

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the 35mm Equivalent Focal Length Calculator

The 35mm Equivalent Focal Length Calculator works out your 35mm equivalent focal length in an instant. Enter lens focal length and crop factor and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the lens focal length.
  2. Enter the crop factor.
  3. Read off your 35mm equivalent focal length — the calculator updates automatically, with no button to press.

Formula

The 35mm Equivalent Focal Length Calculator uses the formula:

35mm equivalent focal length = Lens focal length × Crop factor

Worked example

For example, with lens focal length of 50 mm and crop factor of 1.6, the 35mm equivalent focal length is 80.0.

Inputs used
Lens focal length 50 mm
Crop factor 1.6
Results
35mm equivalent focal length 80.0

Results are estimates for educational use, not professional advice.

Frequently asked questions

It is the focal length that would give the same field of view on a full-frame camera. A 50 mm lens on a 1.6× crop body acts like 80 mm.

It is how much smaller a sensor is than full frame. APS-C is about 1.5–1.6×, and Micro Four Thirds is 2×.

A smaller sensor captures a narrower part of the image circle, effectively zooming in compared with full frame.

No. The lens stays the same; only the field of view changes. The equivalent helps you compare across formats.

The 35mm Equivalent Focal Length Calculator uses the formula: 35mm equivalent focal length = Lens focal length × Crop factor. For example, with lens focal length of 50 mm and crop factor of 1.6, the 35mm equivalent focal length is 80.0.

Enter the lens focal length. Enter the crop factor. Read off your 35mm equivalent focal length — the calculator updates automatically, with no button to press.

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