# PaperFilterJanuary 17, 2012 4:26 PM   Subscribe

PaperFilter, 14 PT Paper in g/m2 ?

How do I convert 14 pt paper to the metric g/m2 system?
posted by yoyo_nyc to Media & Arts (5 answers total)

Handy conversion chart here.

14pt = 14 thou = 0.014" ≅ 300 gsm.
posted by Pinback at 4:41 PM on January 17, 2012

Wikipedia says: For example, a 10 pt. card is 0.010 in (0.254 mm) thick (roughly corresponding to a weight of 250 g/m2);

10 pt -- 250 g/m2
(divide by 10)
1 pt -- 25 g/m2
(multiply by 4)
4 pt -- 100 g/m2
14 pt -- 350 g/m2
posted by zengargoyle at 4:42 PM on January 17, 2012

Also from Wikipedia

Basis Weight(lb) = 82
Caliper(inches) = 0.014
Thickness(mm) = 0.356
Grammage(g/m²) = 308.52
posted by trialex at 4:49 PM on January 17, 2012

Unfortunately there's a lot of wiggle room. One company's 10 point is 380gsm while another's is 310. If it's absolutely critical, I'd suggest checking the manufacturer or distributor's website.

Paper's weird, man.
posted by lekvar at 5:07 PM on January 17, 2012

Yeah, really depends on the type of paper. From two of the papers I stock:
80# cover (216 gsm), laid finish, 13.5 point thickness
80# cover (216 gsm), smooth finish, 10 point thickness

Points (or caliper) is a measure of thickness; g/m2 (gsm) is a measure of the paper's basis weight. A 1/4"-thick sheet of styrofoam and a 1/4"-thick sheet of steel are going to weigh very different amounts.
posted by xedrik at 8:22 PM on January 17, 2012 [1 favorite]

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