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| Metric Size | (Old) UK Knitting Needle Size | USA Knitting Needle Size | UK Crochet Hook Size | USA Crochet Hook Size |
| 0.4 mm | - | - | - | 16 |
| 0.5 mm | - | - | - | 15 |
| 0.6 mm | - | - | 6 | 14 |
| 0.75 mm | - | - | - | 13 |
| 0.7 mm | - | - | 5 | 12 |
| 0.8 mm | - | - | - | 11 |
| 1.0 mm | - | - | 4 | 10 |
| 1.15 mm | - | - | - | 9 |
| 1.25 mm | - | - | 3 | 8 |
| 1.5 mm | - | - | 2.5 | 7 |
| 1.6 mm | - | - | - | 6 |
| 1.7 mm | - | - | - | 5 |
| 1.75 mm | - | - | 2 | 4 |
| 1.85 mm | - | - | - | 3 |
| 1.95 mm | - | - | - | 2 |
| 2.0 mm | 14 | 0 | 1 | 1 |
| 2.25 mm | 13 | 1 | 0 | 0 (B) |
| 2.75 mm | 12 | 2 | - | 2 (C) |
| 3.0 mm | 11 | - | - | - |
| 3.25 mm | 10 | 3 | - | 3 (D) |
| 3.5 mm | - | 4 | - | 4 (E) |
| 3.75 mm | 9 | 5 | - | 5 (F) |
| 4.0 mm | 8 | 6 | - | 6 (G) |
| 4.5 mm | 7 | 7 | - | 7 |
| 5.0 mm | 6 | 8 | - | 8 (H) |
| 5.5 mm | 5 | 9 | - | 9 (I) |
| 6.0 mm | 4 | 10 | - | 10 (J) |
| 6.5 mm | 3 | 10 1/2 | - | 10.5 (K) |
| 7.0 mm | 2 | - | - | - |
| 7.0 mm | 1 | - | - | - |
| 8.0 mm | 0 | 11 | - | 11 (L) |
| 9.0 mm | 0 | 13 | - | 13 (M/N) |
| 10.0 mm | 0 | 15 | - | 15 (N/P) |
| 12.0 mm | - | 17 | - | - |
| 15.0 mm | - | 20 | - | P/Q |
| 20.0 mm | - | 35 | - | S |
| 25.0 mm | - | 50 | - | - |
| Weight | Names | Ply |
WPI (wraps per inch) |
Knitting Gauge (sts per 4"/10cm) |
Typical Needles (mm) |
Held Double Becomes |
| 0 - Lace | Thread Cobweb Lace Light Fingering |
1ply 2ply 3ply |
32-40 | 1.5 - 2.25 | 2 x Cobweb = Light Fingering | |
| 1 - Super Fine | Sock Fingering Baby |
4ply | 14 | 28 | 2.25 - 3.25 | 2 x Lace = Fingering |
| 2 - Fine | Sport Baby |
5ply | 12 | 24 - 26 | 3.25 - 3.75 | 2 x Heavy Lace = Sport |
| 3 - Light | DK Light Worsted |
8ply | 11 | 22 | 3.75 - 4.5 | 2 x Fingering = DK |
| 4 - Medium | Worsted Aran Afghan |
10ply | 8 - 9 | 18 - 20 | 4.5 - 5.5 | 2 x Sport = Aran |
| 5 - Bulky | Chunky Bulky Craft Rug |
12ply | 7 | 14 - 15 | 5.5 - 8 | 2 x DK = Chunky |
| 6 - Super Bulky | Super Chunky Super Bulky Roving |
5 - 6 | 8 - 12 | 8 - 15 | 2 x Aran = Super Chunky | |
| 7 - Jumbo | Jumbo Roving |
1 - 4 | 0 - 6 | 15mm+ |
