Magnification Calculator

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Calculates the magnification of an image produced by a lens or mirror, based on object and image distances.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Object Distance (do) and Image Distance (di) in the units shown.

Step 2

Read Magnification (M) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Object Distance (do): 10 cm; Image Distance (di): 20 cm

Magnification (M): -2

Object Distance (do): 5 cm; Image Distance (di): 10 cm

Magnification (M): -2

Object Distance (do): 15 cm; Image Distance (di): -30 cm

Magnification (M): 2

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