CSS pixel to em at 16px root size converter

Convert CSS pixel to em at 16px root size in the Typography and CSS length family. See a sample calculation, unit definitions, and the interactive converter.

Example conversion: 1 px

0.0625 em at 16px root size

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

Formula and unit definitions

Convert typographic points, picas, CSS pixels and physical print dimensions.

target value = source value × source factor ÷ target factor

Source unit: CSS pixel (px), factor 1, offset 0.

Target unit: em at 16px root size (em-16), factor 16, 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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