Crochet Hooks & Size Charts
Crochet hooks are sized for different weights of yarn and thread. With crochet thread, you will usually use a steel crochet hook. Steel crochet hook sizes range from size 00 to 14. The higher the number, the smaller your stitches will be. For example, a size 1 steel crochet hook will produce much larger stitches than a size 9 steel crochet hook.
Keep in mind that the sizes for projects given in pattern instructions were obtained by working with the size thread or yarn and the hook listed in the materials list. If you work with a smaller hook, depending on your gauge, your project’s size may be smaller; if you work with a larger hook, your finished project's size may be larger. Or if your tension is different than the designer’s you may need to adjust your hook size to match the gauge and measurements that the designer states.
Hooks also come in different lengths and materials. There are small, short hooks perfect for quick fixes. There are also very long straight hooks that are used for working Tunisian patterns. Tunisian hooks can also come in sets with interchangeable tips and cords/cables for working large projects. Hooks can be made from a wide variety of materials including wood, bamboo, resin, plastic, steel and aluminum. Some even are shaped to be more ergonomic. You can use whatever hook material feels the most comfortable to you. One added note: If you find it hard to meet gauge in a pattern, you may try switching your hook material. Yarn slides very easily over metal while it stays in place more on wood. This could give you a different gauge from one material to the next.
Below is a breakdown of most hook sizes.
Yarn Hooks
Millimeter Range U.S. Size Range
2.25mm.............................. B-1
2.5mm................................
2.75mm.............................. C-2
3.125mm............................ D
3.25mm.............................. D-3
3.5mm................................ E-4
3.75mm.............................. F-5
4mm................................... G-6
4.25mm.............................. G
4.5mm................................ 7
5mm................................... H-8
5.25mm.............................. I
5.5mm................................ I-9
5.75mm.............................. J
6mm................................... J-10
6.5mm................................ K-10 ½
7mm...................................
8mm................................... L-11
9mm................................... M/N-13
10mm................................. N/P-15
11.5mm.............................. P-16
12mm.................................
15mm................................. P/Q
15.75mm............................ Q
16mm................................. Q
19mm................................. S
25mm................................. T/U/X
30mm................................. T/X
Steel Thread Hooks
Millimeter Range U.S. Size Range
3.5mm.................................. 00
3.25mm................................ 0
2.75mm................................ 1
2.7mm.................................. 00
2.55mm................................ 0
2.35mm................................ 1
2.25mm................................ 2
2.2mm.................................. 2
2.1mm.................................. 3
2mm..................................... 4
1.9mm.................................. 5
1.8mm.................................. 6
1.75mm................................ 4/0
1.7mm.................................. 5
1.65mm................................ 7
1.6mm.................................. 6
1.5mm.................................. 8/7/2
1.4mm.................................. 9/8
1.3mm.................................. 10
1.25mm................................ 9/4
1.15mm................................ 10
1.1mm.................................. 11
1.05mm................................ 11
1mm..................................... 12/6
0.95mm................................ 13
0.9mm.................................. 14/8
0.85mm................................ 13
0.75mm................................ 14/10
0.6mm.................................. 12