Diopter Calculator

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Positive for a converging lens, enter the magnitude here.
Optical powerConverging lens
5D

Optical power of the lens in diopters

5 D
Strong diverging<-10Diverging-10--1Weak-1-1Converging1-10Strong converging10+

This lens has an optical power of 5.0000 D.

  • A focal length of 20 cm converts to 5.0000 diopters using P = 1 / f (f in metres).
  • The reciprocal relationship means halving the focal length doubles the power: 10.00 D for 10.0 cm.

Next stepSwitch to "Thin-lens equation" mode to find where the image forms for a specific object distance.

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