Crochet Hook Sizes are confusing!

If you have have trouble with your crochet gauge, it probably isn't you.  What the US calls a hook is not always the same from company to company.

millimeter	Addi-Skacel	KA	Knitters Pride	Clover	Brittany	Crystalites
2mm	A
2.25mm				B
2.5mm	B
2.75mm		C
3mm	C
3.25mm	D	D		D	D
3.5mm	E	E		E	E
3.75mm	E/F	F	F/5	F	F
4mm	F		G/6	G	G	G
4.25mm		G
4.5mm	G		7		7
5mm	H	H	H/8	H	H	H
5.5mm	I	I	I/9	I	I	I
6mm	J	J	J/10	J	J	J
6.5mm		K	K/10.5		K	K
7mm	K		7MM		7.0
7.5mm					7.5
8mm	L	L	L/11		L	L
9mm	M	M	M/13		M	M
10mm	N	N	N/15			N
11.5mm						P
12mm	0	P	17
15mm	P
20mm	S

And this became even more evident as I tried to create a table for those hooks that I stock.  

I suggest looking closer at your crochet hooks.  If your projects are not coming out to gauge, check the millimeter size of your hook.  But in all cases, it does not matter what hook you use, only that you are getting the gauge that the pattern calls for.

NOTE:  Handknitters! Beware.....there is also some discrepancy in US knitting needle sizes as well.  It is for this reason than my circular knitting needle pages are sort by mm sizes.