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Lens Power

Calculate lens power (d) using the lens power formula.

Lens power (D): -
Visual representation

Lens Power diagram

The diagram updates with your entries and is illustrative, not necessarily drawn to scale.

Calculation explained

How this result was calculated

The formula, your substituted values, and the evaluated result are shown below.

Reference: Formulae and Tables, State Examinations Commission (2014), page 61.
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How the Lens Power works

This calculator applies the formula given in Formulae and Tables, State Examinations Commission (2014), page 61. Enter values in consistent units.

Formula and inputs

1 ÷ focal

Inputs: Focal length (m).

Using the result

The result is rounded to 4 decimal places. Check units, assumptions and significant figures before using the answer.

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