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Diopter Conversion Calculator

Formula

The formula to convert focal length to diopter (D) is:

$\text{D} = \frac{1000}{\text{F}}$

Where:

A diopter is a unit equal to the reciprocal of the focal length of a lens (in meters), that describes the refractive power of that lens.

Let's assume the following value:

Using the formula:

$\text{D} = \frac{1000}{200} = 5 \text{ 1/m}$

The Diopter (D) is 5 1/m.