Point (desktop publishing) (pt)

Exactly 1/72 inch (about 0.3528 mm). The point used by PostScript, PDF, CSS and word processors for font sizes.

What is a point?

Symbol: pt
Quantity: Typography
Unit system: other
Definition: Exactly 1/72 inch (about 0.3528 mm). The point used by PostScript, PDF, CSS and word processors for font sizes.
Exact: Yes, the value is exact by definition
Source: W3C CSS Values and Units Module Level 3 (absolute lengths)

Used for font sizes in word processors, design software, PDF and CSS, as in 12 pt text.

Point (desktop publishing) in other units
Point (desktop publishing)	Millimeter	Inch	Pixel (CSS)
1 pt	≈ 0.3527777778 mm	≈ 0.01388888889 in	≈ 1.333333333 px
10 pt	≈ 3.527777778 mm	≈ 0.1388888889 in	≈ 13.33333333 px
100 pt	≈ 35.27777778 mm	≈ 1.388888889 in	≈ 133.3333333 px
1000 pt	≈ 352.7777778 mm	≈ 13.88888889 in	≈ 1333.333333 px

The next smaller typography unit is the printer's point (pt (printer's)). 1 pt ≈ 1.00375001 pt (printer's), and 1 pt (printer's) = 0.996264 pt.

The next larger typography unit is the millimeter (mm). 1 pt ≈ 0.3527777778 mm, and 1 mm ≈ 2.834645669 pt.

How many millimeters are in one point?: One point ≈ 0.3527777778 mm (millimeters).
How many inches are in one point?: One point ≈ 0.01388888889 in (inches).
How many CSS pixels are in one point?: One point ≈ 1.333333333 px (CSS pixels).