Yarn Weights - a "Standard"

Nothing like a standard; somewhat of an oxymoron when there are several "standards" to a standard!

For the sake of simplicity, we will list as many standards as possible against our yarns which will be primarily based on Wraps Per Inch (WPI). Then we will list the standards as per the "Yarn weight - Wikipedia" page. Which can be found here:

Yarn Weight Wikipedia

USAUKAustraliaGermanym/100gWraps Per InchRecommended knitting needle size, mmRecommended crochet hook size, mmOther terms used
0 or Lace 1 ply     More than 800 40+ wpi 1.5 - 2.5 1.5 - 2.5 Single, Cobweb, Thread, Zephyr
0 or Lace 2 ply   2 fädig (ply) 600-800 30-40 wpi 1.5 - 2.5 1.5 - 2.5  
1 or Super Fine 3 ply 3 ply 3 fädig 500-600 20-30 wpi 2 - 3 2.25 - 3.5 Light Fingering, Sock, Baby
1 or Super Fine 4 ply 4 ply 4 fädig 350-450 14-24 wpi 2 - 3 2.25 - 3.5 Fingering, Sock, Baby
2 or Fine   5 ply 6 fädig 250-350 12-18 wpi 3 - 4 3.5 - 4.5 Sport, Baby, 3-ply (obsolete American)
3 or Light DK (Double Knit) or 8 ply 8 ply   200-250 11-15 wpi 4 - 4.5 4.5 - 5.5 Light Worsted, DK
4 or Medium Worsted, Aran, Triple Knit (rare) 10 or 12 ply   120-200 9-12 wpi 4.5 - 5.5 5.5 - 6.5 Worsted, Afghan, Fisherman, 4-ply (obsolete American)
5 or Bulky Chunky, Double Double Knit (rare) 12 or 16 ply   100-130 6-8 wpi 5.5 - 8 6.5 - 9 Craft, Rug
6 or Super Bulky Super Chunky     Less than 100 5-6 wpi >8 >9 Roving
7 or Jumbo       Less than 100 n/a 12.75 mm and larger 15 mm and larger Roving

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