When converting from US or old UK knitting needle sizes to mm, what are the conversions for these?
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2@AllisonC Sorry, my previous comment was wrong. That question and this one have very similar answers, because the conversions somewhat overlap. It might be confusing for knitters not familiar with crochet, because US crochet hook sizes tend to use the letter system, not the number system. I think Catija's question and answer could be expanded to include both knitting and crocheting, but it would need editing.– BelleJan 23, 2020 at 14:59
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Sorry about that! I'd misread the two questions as being the same, then retracted it without realizing that it left a comment.– Allison CJan 23, 2020 at 16:29
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@AllisonC I'll add a link to it in my answer, since they're pretty closely related.– BelleJan 23, 2020 at 16:50
2 Answers
Here's an overview of all the knitting needle sizes I know.
Metric UK US 0.5mm 24 - 0.75mm 22 - 1.0mm 20 5/0 1.25mm 18 4/0 1.5mm 17 000 1.625mm 16 - 1.75mm 15 00 2.0mm 14 0 2.25mm 13 1 2.5mm - 1.5 2.75mm 12 2 3.0mm 11 2.5 3.25mm 10 3 3.5mm - 4 3.75mm 9 5 4.0mm 8 6 4.5mm 7 7 5.0mm 6 8 5.5mm 5 9 6.0mm 4 10 6.5mm 3 10.5 7.0mm 2 - 7.5mm 1 - 8.0mm 0 11 9.0mm 00 13 10.0mm 000 15 12.0mm - 17 15.0mm - 19 20.0mm - 35 50.0mm - 50
For crochet hooks, see: What is the conversion for UK and US crochet hooks to mm?
Here is a chart for metric/US/UK conversions with crochet hook sizes as welll:
Metric(mm) US UK Crochet
2.0 1 14 --
2.25 1 13 B
2.5 1.5 -- --
2.75 2 12 C
3.0 2.5 11 --
3.25 3 10 D
3.5 4 -- E
3.75 5 9 F
4.0 6 8 G
4.5 7 7 --
5.0 8 6 H
5.5 9 5 I
6.0 10 4 J
6.5 10.5 3 K
7.0 -- 2 --
7.5 -- 1 --
8.0 11 0 L
9.0 13 00 --
10.0 15 000 --
12.0 - 12.75 17 -- --
15.0 - 16.0 19 -- --
19.0 35 -- --
20.0 36 -- --
25.0 50 -- --
I've also attached a link below to a printable version that may be useful.