Conversion Chart For Crochet Hooks

Japanese Number mm
2/0 2.0mm
3/0 2.3mm
4/0 2.5mm
5/0 3.0mm
6/0 3.5mm
7/0 4.0mm
7.5/0 4.5mm
8/0 5.0mm
10/0 6.0mm
0 1.75mm
2 1.50mm
4 1.25mm
6 1.00mm
8 0.90mm