There are industry variances in conversions and our patterns. Needles and hooks are based on the following chart.

 

Knitting Needle Size Equivalents

Canadian & British	000	00	0	1	2	3	4	5	6	7	8	9	-	10	11	12	13	14	15
Metric (mm)	10.00	9.00	8.00	7.50	7.00	6.50	6.00	5.50	5.00	4.50	4.00	3.75	3.50	3.25	3.00	2.75	2.25	2.00	1.75
American	15	13	11	-	-	10.5	10	9	8	7	6	5	4	3	-	2	1	0	-

 

Aluminum Crochet Hooks Size Equivalents

Canadian & British	000	00	0	2	3	4	5	6	7	8	-	9	10	11	-	12	13	14
Metric (mm)	10.00	9.00	8.00	7.00	6.50	6.00	5.50	5.00	4.50	4.00	3.75	3.50	3.25	3.00	2.75	2.50	2.25	2.00
American	N-15	M-13	L11	-	K-10.5	J-10	I-9	H-8	7	G-6	F-5	E-4	D-3	-	C-2	-	B-1	-

 

Steel Crochet Hooks Size Equivalents

American & Canadian	00	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
Metric (mm)	2.70	2.55	2.00	1.95	1.85	1.75	1.70	1.60	1.50	1.25	1.15	1.00	0.80	0.75	0.70	0.60
British	-	00	1	-	-	2	-	-	2.5	3	-	4	-	5	-	6