Crochet

I recently came across this amazing crochet hook size gauge only to find it is no longer available at www.gourmetcrochet.com because crochet hooks are sized according to the various manufacturers own standards and therefore vary quite dramtically. Metal crochet hooks also differ from plastic ones.

The Craft Yarn Council of America (CYCA) has been liaising with hook manufacturers to develop U.S. size standards for knitting needles and crochet hooks. Apparently, however, sizing and labelling conflicts remain between manufacturers for crochet hooks above size L-11 (8 mm). CYCA recommends the millimetre sizing because it is the most accurate.

The UK hook size standard is based on the Imperial Standard Wire Gauge (SWG).
More information can be found at www.yarnstandards.com/hooks.html
 
Metric:         Canada/UK:      USA:            USA:

2.              14              -               0
2.25            13              B               1
2.5             12              -               -
2.75            -               C               2
3.              11              -               -
3.5             9               E               4
3.75            -               F               5
4.              8               G               6
4.5             7               -               7
5.              6               H               8
5.5             5               I               9
6.              4               J               10
6.5             3               K               10.5
7.              2               -                -
8.              0               L               11
9.              00              M               13
10.             000             N               15