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What's the conversion between InDesign's point measurement (as used in leading and text size etc) and millimetres? What's the pt : mm ratio?

I've seen sources suggesting that a point is 1/72 of an inch, and an inch is 25.4mm, so in theory a point would be 0.3528mm and a millimetre would be 2.8346 pts, but I'd like something authoritative as I might well have gone wrong somewhere there.

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Not a significant thing to edit but it's actually "Vice Versa" – Ryan May 16 '14 at 14:05
1 inch is exactly 25.4 mm – thebodzio May 16 '14 at 15:41
Picking nits a bit: it's not "InDesign points," it's "Postscript points," which are exactly 1/72nd inch. Traditional points are ever-so-slightly larger. InDesign gives you the option of working with either. – Alan Gilbertson May 16 '14 at 23:35
up vote 3 down vote accepted

1 pt is equal to

0.08333 picas

0.01389 inches

0.3528 mm (millimeters)

one nice feature in basically all of adobe's software is that it can do those conversions for you. You can simply type in any of the unit of measure and it will even do basic math for you too like +2mm

adding 2mm

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I'd add that 1 pica = 12 pt. – Mikhail V Mar 20 at 22:04

"Points" in typography e.g. in Indesign, Illustrator, Photoshop etc are "PostScript points" and, helpfully, they're a unit Google converts on searches like points to mm or mm to points.

Has to be points or postscript points, not pts or anything involving software names.

One point is 0.352777778 millimetres.

enter image description here

One millimetre is 2.83464567 PostScript points.

enter image description here

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