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Crop Factor Calculator

Work out crop factor instantly with clear inputs, formula shown and shareable results.

About Crop Factor Calculator

Crop factor is the 43.267 mm full frame diagonal divided by the sensor's own diagonal, which follows from Pythagoras on the sensor dimensions. The area ratio matters more than the crop factor for light gathering, since a 1.5x crop sensor has only 44% of the full frame surface area.

Formulas

Sensor diagonal

diagonal = sqrt(width^2 + height^2)

Crop factor

crop = 43.267 / sensor diagonal

Worked example

With the default values below, Crop Factor Calculator returns Crop factor of 1.5339. Change any input above and every figure here is recalculated in your browser.

Inputs used

Sensor widthminimum 0.1 mm
23.5 mm
Sensor heightminimum 0.1 mm
15.6 mm

Results

Crop factor
1.5339
Sensor diagonal
28.207 mm
Full frame area divided by this sensor
2.3568
Aspect ratio as a decimal
1.5064

Step by step

  1. 1Values used
  2. 2Sensor diagonal
  3. 3Crop factor
  4. 4Crop factor= 1.5339
  5. 5Sensor diagonal= 28.207 mm
  6. 6Full frame area divided by this sensor= 2.3568
  7. 7Aspect ratio as a decimal= 1.5064

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Crop Factor figure worked out?

diagonal = sqrt(width^2 + height^2). Crop factor is the 43.267 mm full frame diagonal divided by the sensor's own diagonal, which follows from Pythagoras on the sensor dimensions.

Why does this matter?

The area ratio matters more than the crop factor for light gathering, since a 1.5x crop sensor has only 44% of the full frame surface area.

What do I need to enter?

Enter sensor width, sensor height. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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