pixel per millimeter to pixel per inch converter

Convert pixel per millimeter to pixel per inch in the Print and image resolution family. See a sample calculation, unit definitions, and the interactive converter.

Example conversion: 1 px-mm

25.4 pixel per inch

This example is calculated from the same unit registry used by the interactive converter.

Formula and unit definitions

Convert resolution notation such as pixels per inch and pixels per centimeter; use the unit that matches your workflow.

target value = source value × source factor ÷ target factor

Source unit: pixel per millimeter (px-mm), factor 25.4, offset 0.

Target unit: pixel per inch (ppi), factor 1, offset 0.

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Important note

The calculation is performed locally from the listed unit definitions. Display results are rounded for readability; high-precision and regulated work should use the governing standard and appropriate significant figures.

For high-precision, regulated or safety-critical use, check the underlying standard and its required precision. Historical and approximate units are identified in their names or family descriptions.

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