Abbreviations & Symbols
2. Crochet Chart Symbols
3. Skill Level Symbols
4. Yarn Size Symbols
5. Crochet Hook Sizes
Millimeters U.S. Size
2.25mm..............................B-1
2.75mm..............................C-2
3.25mm..............................D-3
3.5mm................................E-4
3.75mm..............................F-5
4mm..................................G-6
4.5mm...................................7
5mm..................................H-8
5.5mm.................................I-9
6mm..................................J-10
6.5mm...........................K-10.5
8mm..................................L-11
9mm.............................M/N-13
10mm.............................N/P-15
15mm..................................P/Q
16mm.....................................Q
19mm......................................S