Crochet Hook Size Conversion ChartThe standard thicknesses (sizes) of crochet hooks are different for the Japan (JP), US, and UK regions. Please also note that the notations for each crochet hook size are also different.First determine the size in millimeters (mm) for the hook specified, then choose the closest hook size that is most comfortable to use.

JP US UK

2.00 mm

2.25 mm

2.30 mm

2.50 mm

2.75 mm

3.00 mm

3.25 mm

3.50 mm

3.75 mm

4.00 mm

4.25 mm

4.50 mm

5.00 mm

5.50 mm

6.00 mm

6.50 mm

7.00 mm

8.00 mm

9.00 mm

10.00 mm

12.00 mm

15.00 mm

16.00 mm

17.50 mm19.00 mm

2/0 — 14

— B/1 13

3/0 — —

4/0 — 12

— C/2 —

5/0 — 11

— D/3 10

6/0 E/4 9— F/5 —

7/0 G/6 8

— — —

7.5/0 7 7

8/0 H/8 6

— I/9 5

10/0 J/10 4

— K/10.5 3

7 mm — 2

8 mm L/11 0— M/13 00

10 mm N/15 000

12 mm O/16 —

— P/19 —

— Q —

— R —

— S/35 —

JP US UK

2.00 mm

2.10 mm

2.25 mm

2.40 mm

2.50 mm

2.70 mm

2.75 mm

3.00 mm

3.25 mm

3.30 mm

3.50 mm

3.60 mm

3.75 mm

3.90 mm

4.00 mm

4.20 mm

4.25 mm

4.50 mm

4.80 mm

5.00 mm

5.10 mm

5.40 mm

5.50 mm

5.70 mm6.00 mm

6.30 mm

6.50 mm

6.60 mm

7.00 mm

7.50 mm

8.00 mm

9.00 mm

10.00 mm

12.00 mm

12.75 mm

15.00 mm

19.00 mm25.00 mm

— 0 14

0 — —

— 1 13

1 — —

— — —

2 — —

— 2 12

3 — 11— 3 10

4 — —

— 4 —

5 — —

— 5 9

6 — —

— 6 8

7 — —

— — —

8 7 79 — —

— 8 6

10 — —

11 — —

— 9 5

12 — —

13 10 4

14 — —— 10.5 3

15 — —7 mm — 2

— — 1

8 mm 11 0

— 13 00

10 mm 15 000

12 mm — —

— 17 —

— 19 —

— 35 —

— 50 —

Knitting Needle Size Conversion ChartThe standard thicknesses (sizes) of knitting needles are different for the Japan (JP), US, and UK regions. First determine the size in millimeters (mm) for the needle specified, then choose the closest needle size that is most comfortable to use.