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Crop Factor Calculator

Determine a sensor's crop factor relative to full-frame (43.3mm diagonal).

Introduction

Crop Factor Calculator — Determine a sensor's crop factor relative to full-frame (43.3mm diagonal). Enter Sensor Width, Sensor Height to get an instant, accurate result.

Formula

Sensor diagonal = √(sensor width² + sensor height²), by the Pythagorean theorem. Crop factor = 43.3mm (full-frame diagonal) / sensor diagonal.

Step-by-step

  1. Enter the Sensor Width.
  2. Enter the Sensor Height.
  3. Click Calculate to see your result instantly.

Real-world example

Example: With Sensor Width = 23.5 mm, Sensor Height = 15.6 mm, the Crop Factor Calculator gives Sensor Diagonal Mm: 28.2066, Crop Factor: 1.5351.

Frequently Asked Questions

What does a crop factor of 1.5 mean?
The sensor's diagonal is 1/1.5 the size of a full-frame sensor's diagonal, so a given focal length captures a narrower field of view than it would on full frame.
Is a smaller sensor always a crop factor above 1?
Yes — any sensor smaller than full frame (36×24mm) has a crop factor greater than 1; a sensor larger than full frame (medium format) has a crop factor below 1.
What inputs does the Crop Factor Calculator need?
You'll need to provide: Sensor Width, Sensor Height. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Crop Factor Calculator?
The Crop Factor Calculator applies the formula exactly as calculated — Sensor diagonal = √(sensor width² + sensor height²), by the Pythagorean theorem. Crop factor = 43.3mm (full-frame diagonal) / sensor diagonal. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Crop Factor Calculator free to use?
Yes, the Crop Factor Calculator is completely free, requires no signup, and runs instantly in your browser.

About the Crop Factor Calculator

The Crop Factor Calculator uses a real, verifiable formula — Sensor diagonal = √(sensor width² + sensor height²), by the Pythagorean theorem. Crop factor = 43.3mm (full-frame diagonal) / sensor diagonal. — so results are accurate every time, not an approximation.