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Learn to Crochet.

Hook and Yarn Conversions

Thread (Steel) Hooks

Metric (mm) UK / Canadian US Japanese Suggest UK Thread/Yarn Suggested US Thread/Yarn Suggested Australian Thread/Yarn
0.50 22 no.70 thread
0.55 21 no.70 thread
0.60 6 14 20 no.70 thread
0.70 13 18
0.75 5 12 17 no.30-60 thread
0.80 11 16
0.90 14
1.00 4 10 no.20-30 thread
1.10 10
1.15 9
1.25 3 8 no.10-20 thread
1.50 2 7 2 no.10-20 thread
1.60 6
1.70 5
1.75 2 4 no.5 thread
1.85 3
1.90 1
1.95 2
2.00 1 1 no.3 thread / 3-ply
2.25 00 0
2.50 3-ply
2.75
3.00 00 4-ply

Yarn Hooks

Metric (mm) Old UK Yarn Size US Yarn Size Japanese Suggest UK Thread/Yarn Suggested US Thread/Yarn Suggested Australian Thread/Yarn
2.00 14 2/0 no.3 thread / 3-ply
2.25 13 B/1 3/0
2.50 12 4/0 3-ply
2.75 C/2
3.00 11 5/0 4-ply
3.25 10 D/3
3.50 9 E/4 6/0 4-ply / double knit
3.75 F/5
4.00 8 G/6 7/0 Double knit Light Worsted 8 ply
4.25
4.50 7 7 Double knit / Aran Light Worsted / Worsted 8 ply/10 ply
5.00 6 H/8 8/0 Aran Worsted
5.50 5 I/9 Aran Worsted
6.00 4 J/10 10/0 Aran / Chunky
6.50 3 K/10
7.00 2 Chunky Bulky 16 ply
8.00 0 L/11
9.00 00 M/13
10.00 000 N/15
11.00
12.00 O/16
13.00
14.00
15.00 P/16
16.00 Q
17.00
18.00
19.00 S/35
20.00