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Pixel (CSS) (px)

The CSS reference pixel: exactly 1/96 inch, or 0.75 point. Real screen pixels vary in size.

What is a CSS pixel?

Symbol
px
Quantity
Typography
Unit system
other
Definition
The CSS reference pixel: exactly 1/96 inch, or 0.75 point. Real screen pixels vary in size.
Exact
Yes, the value is exact by definition
Source
W3C CSS Values and Units Module Level 3 (absolute lengths)

Common applications

Used for sizes and layouts in web design and app interfaces.

Pixel (CSS) in other typography units

Pixel (CSS) quick reference

Pixel (CSS) in other units
Pixel (CSS)MillimeterPoint (desktop publishing)Centimeter
1 px≈ 0.2645833333 mm= 0.75 pt≈ 0.02645833333 cm
10 px≈ 2.645833333 mm= 7.5 pt≈ 0.2645833333 cm
100 px≈ 26.45833333 mm= 75 pt≈ 2.645833333 cm
1000 px≈ 264.5833333 mm= 750 pt≈ 26.45833333 cm

Where the CSS pixel fits

The next smaller typography unit is the quarter-millimeter (Q). 1 px ≈ 1.058333333 Q, and 1 Q ≈ 0.9448818898 px.

The next larger typography unit is the printer's point (pt (printer's)). 1 px ≈ 0.7528125075 pt (printer's), and 1 pt (printer's) = 1.328352 px.

Frequently asked questions

How many millimeters are in one CSS pixel?
One CSS pixel ≈ 0.2645833333 mm (millimeters).
How many points are in one CSS pixel?
One CSS pixel = 0.75 pt (points).
How many centimeters are in one CSS pixel?
One CSS pixel ≈ 0.02645833333 cm (centimeters).