basic

Lens Power in Diopters Calculator

D = 1 / f, with f in metres.

Compute the optical power of a thin lens in diopters from its focal length: D = 1 / f, where f is the focal length in metres. Positive D ⇒ converging; negative ⇒ diverging.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

cm

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

D = 1 / f (f in metres).

In depth

Compute the optical power of a thin lens in diopters from its focal length: D = 1 / f, where f is the focal length in metres. Positive D ⇒ converging; negative ⇒ diverging.