This crochet hook conversion chart will help when you are using crochet patterns that list the hook size in an alternative measurement to the hooks you have on hand.

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Steel Hook Conversion Chart



U.S. 00 0 1 2 3 4 5 6
English     3/0 2/0 1/0 1 1-1/2 2
Metric (mm) 2.70 2.55 2.35 2.20 2.10 1.75 1.70 1.60

U.S. 7 8 9 10 11 12 13 14
English 2-1/2 3 4 5 5-1/2 6 6-1/2 7
Metric (mm) 1.50 1.40 1.25 1.15 1.05 1.00 .95 .90