Diopter Calculator — Free Online Tool
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Diopter Calculator

Calculate optical power in diopters or focal length

Instructions: Select what you want to calculate (Diopters from Focal Length, or Focal Length from Diopters). Enter the known value below.
Calculation Mode
Optic Parameters

Calculation Results

⚠️ For optics and physics education reference only. Positive diopters indicate converging (convex) lenses, while negative values indicate diverging (concave) lenses.

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