Crochet Hook Sizes

Usually crochet hooks or needles are made of materials like wood, plastic, bone, stainless-steel, aluminum or tortoise-shell. If the hooks are constructed with such fabricating materials, they act as a stiff support to conduct all the heavy crocheting work with wools and cotton threads. When you consider a crochet project, along with the hook sizes, the built of the hooks are taken under consideration too. For instance, the sharpness of its points, the finesse of the rods, the back curve, handles, etc.

Generally, crochet hook sizes have a very universal marking. The sizes are coined into the hook itself. For instance, if the hook has a letter 'N'; that stands for America. This way there are many determining systems for hook sizes which are based on the letters and number systems. In the US, sizes are determined by numbers and letters. In Europe it's the physical metric system. Aluminum and steel crochet hooks have a standard-clear marking engraved into the hooks. Crochet hooks are broadly measured by the thickness of the needle and sizes are measured in millimeters or inch systems. Practically manufacturers create hooks depending on the country, the age of the crochet patterns and also the brand.

Chart for Crochet Hook Sizes

Conversion Chart
European Metric	US size	UK size
2 mm	B/1	14
2.25 mm	-	13
2.5 mm	C/2	12
3 mm	-	11
3.25 mm	D/3	10
3.5 mm	E/4	9
4 mm	G/6	8
4.5 mm	7	7
5 mm	H/8	6
5.5 mm	I/9	5
6 mm	J/10	4
6.5 mm	K/10.5	3
7 mm	-	2
8 mm	L/11	0
9 mm	M/13	00
10 mm	N/15	000
12 mm	O/16	-
15 mm	P/19	-
16 mm	Q	-
17 ½ mm	R	-
19 mm	S/35	-

In this manner, there are many hook sizes and equivalents that exist and are available on the Internet. The hooks that are obtainable in B-K and N sizes are usually aluminum fabricated. Any hook size which is larger than N is made of plastic. As mentioned earlier, the sizes chiefly and variably differ in accordance to a country too. Supposing an Australian would want a size 2 crochet hook, if you consider being in any other country say US or Europe, it wouldn't be of the same size. Hopefully the conversion chart tabled above is a very helpful way to comprehend the conversions from Metric to UK to US sizes for aluminum hooks. Crochet hook sizes are supposed to jibe with the thread's thickness. If the yarn is thicker, it naturally would need thicker hooks. Normally, sizes range from the lowest figure, i.e., 0.60 mm right up to 25.0 mm. Smaller hooks are marked with numbers, not letters. They are the steel hooks. Steel crochet hooks are practiced for fine yarns and thread crochet. Something with cobweb yarns, lace weight or bead crochet. Here is a table below, which will give you the steel hook sizes conversions.

Steel Hook Size Conversion

Conversion Chart
Metric (mm)	US size	Canadian/UK size
0.60 mm	16	-
0.75 mm	14	-
0.85 mm	13	7
1.00 mm	12	6.5
1.10 mm	11	6
1.30 mm	10	5.5
1.4 mm	9	5
1.5 mm	8	4.5
1.65 mm	7	4
1.8 mm	6	3.5
1.90 mm	5	3
2.0 mm	4	2.5
2.10 mm	3	2
2.25 mm	2	1.5
2.75 mm	1	1
3.25 mm	0	0
3.50 mm	00	-

The next category that comes in crochet hooks is the yarn size hooks, often found in plastic forms. They are best suited for the beginners to begin crocheting their project with. For professionals aluminum or metal hooks are ideal. The most famous ones are Susan Bates and Boye (Wrights) that are easily available in craft stores. For an untrained eye all the hook sizes may look the same. But for a fervent knitter, running through a variety of them may get overwhelming. The best option is to depend on the kind of crochet work you do. That's when you would be able to decide with your pick! All the best!