Focal Length / Image Distance Calculator

Free focal length / image distance calculator for lens equation calculator. Enter the values below to get an instant result.

JavaScript is required for live calculation.

You can still read how Focal Length / Image Distance Calculator works, the formula, examples, and FAQs below.

Object
Image distance or focal length

Inputs

Object

Image distance or focal length

Results update when you click Calculate.

Image distance

25.9259

1 / (1/(object) + 1/(image_distance_or_focal_leng))

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Recently used

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What this result means

Free focal length / image distance calculator for lens equation calculator. Enter the values below to get an instant result. Calculate focal length / image distance: 1 / (1/(object) + 1/(image_distance_or_focal_leng)).

Assumptions

Rule dependency: Universal formula.

How it works

Calculate focal length / image distance: 1 / (1/(object) + 1/(image_distance_or_focal_leng)).

Example

Example: “lens equation calculator”. Enter your values and click the button to get a result.

Frequently asked questions

What does this focal length / image distance calculator do?+

It helps you calculate focal length / image distance. Typical search: “lens equation calculator”.

How should I read the result?+

Calculate focal length / image distance using object/image distance or focal length. Result: unknown lens variable.