How many pixels are in one em?

One em equals 16 px. The formula is px = em × 16.

How do I convert ems to pixels?

Multiply the value in ems by 16. For example, 100 × 16 = 1,600 — so 100 em = 1,600 px.

Pair · linear · factor 16

ems to pixels

empx

Active unit

ems · ≈ 1,600 px (base)

All units

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emem100

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Frequently asked questions

A glowing emerald letter built from a pixel grid beside a classic metal type sort, wrapped in a geometric grid of measures, on a cosmic nebula in violet and magenta

Typography

A pixel is not a dot: a short history of typographic units

The designer thinks in pixels, the typesetter in points, and the client holds a millimeter ruler up to the print — and nothing matches. This apparent Tower of Babel is not a lack of standards but five centuries of evolution: from lead type and "magpie" books, through the Apple–Microsoft war over screen resolution, to the CSS pixel that is not a dot on the panel at all.

12 min