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 Sizing Guide

Conversion chats to help you:
Knitting needles
Crochet hook


Knitting needle sizing
Knitting needles come in Amercan, British, Japanese and Metric sizing. Although all 3 systems have their equivalents in almost all sizes, there is a minute difference. For example, a Size 8 British needle is equivalent to the 4mm metric needle, but Size 8 British needle is actually 4.2mm. In practice, 0.2mm has a very slight effect on tension only. The easiest thing to do is to use a needle gauge to work which needle to use! Generally, most knitting books will use the American or British system along side with the metric system.

Metric - British - American
Metric (mm)
 2.00 2.25 2.50 3.00 3.25 3.50 3.75 4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50 9.00 10.00 12.00 15.00
British 14
 13
 12
 11
 10
 9
8
 7
 6
 5
 4
 3
 2
 1
 0
 00
 000


American
 00
 0
 1.5
 2.5
 3
 4
 5
 6
 7
 8
 9
 10
 10.5 10.75
11
13
 15
 17
 19

Metric - Japanese / Chinese
Metric (mm)
 2.10 2.40 2.70 3.00 3.30 3.60 3.90 4.20 4.50 4.80 5.10 5.40 5.70 6.00 6.30 6.60
Japanese Size
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15


Crochet hook sizing
Crochet hooks too come in various sizing systems. These tend to be less standardised than knitting needles.

Metric - British - American
Metric (mm)
 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.50 5.00 5.50 6.00 6.50 7.00 8.00 9.00 10.00
British 14 13 12 - 11 10 9 - 8 7 6 5 4 3 2 0 00 000
American
 - B/1 - C/2 - D/3 E/4 F/5 G/6 7 H/8 I/9 J/10 K/10.5 - L/11 M/13 N/15



Knit. Create. Enjoy.
(C) Tropical Knitter 2009