Whenever you embark on a new craft there is always a set of terminology to get used to which can vary from country to country.

So here is a handy chart to refer to when following crochet patterns and tutorials from different countries:

Metric (mm)
 UK
 US
2.0 mm
 14 –
2.25 mm
 13 1/B
2.5 mm
 12 –
2.75 mm
 12 2/C
3 mm
 11 –
3.25 mm
 10 3/D
3.5 mm
 9 4/E
3.75 mm
 – 5/F
4 mm
 8 6/G
4.5 mm
 7 7
5 mm
 6 8/H
5.5 mm
 5 9/I
6 mm
 4 10 / J
6.5 mm
 3 10 1/2 / K
7 mm
 2 –
8 mm
 0 11/L
9 mm
 00 13/M&N
10 mm
 000 15/N&P
15.75mm or 16mm
 – P/Q

Get Crocheting!