| Canadian & British | 000 | 00 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | - | 10 | 11 | 12 | 13 | 14 | 15 |
| Metric (mm) | 10.00 | 9.00 | 8.00 | 7.50 | 7.00 | 6.50 | 6.00 | 5.50 | 5.00 | 4.50 | 4.00 | 3.75 | 3.50 | 3.25 | 3.00 | 2.75 | 2.25 | 2.00 | 1.75 |
| American | 15 | 13 | 11 | - | - | 10.5 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | - | 2 | 1 | 0 | - |
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| Fingering, 10 count crochet thread | Sock, Fingering, Baby | Sport, Baby | DK, Light Worsted | Worsted, Afghan, Aran | Chunky, Craft, Rug | Bulky, Roving | Jumbo, Roving |