| US | Metric | Old UK |
| 0 | 2mm | 14 |
| 1 | 2.25mm | 13 |
| 2.5mm | ||
| 2 | 2.75mm | 12 |
| 3mm | 11 | |
| 3 | 3.25mm | 10 |
| 4 | 3.5mm | |
| 5 | 3.75mm | 9 |
| 6 | 4mm | 8 |
| 7 | 4.5mm | 7 |
| 8 | 5mm | 6 |
| 9 | 5.5mm | 5 |
| 10 | 6mm | 4 |
| 10 ½ | 6.5mm | 3 |
| 7mm | 2 | |
| 7.5mm | 1 | |
| 11 | 8mm | 0 |
| 13 | 9mm | 00 |
| 15 | 10mm | 000 |
Japanese Needle Sizes
0 = 2.1mm
1 = 2.4mm
2 =2.7mm
3 = 3.0mm
4 = 3.3mm
5 =3.6mm
6 = 3.9mm
7 = 4.2mm
8 = 4.5mm
9 = 4.8mm
10 = 5.1mm
11 = 5.4mm
12 = 5.7mm
13 = 6.0mm
14 = 6.3mm
15 = 6.6mm
Yarns
| Australia/UK | US | Approximate Tensions |
| 2 ply | lace weight | |
| 3 ply, 4 ply, 5 ply, jumper weight | fingering | 32 – 26 sts to 4 inches (10cm) |
| 8 ply, dk, double knit | sport weight – double knit | 22 – 24 sts to 4 inches |
| 10 ply, aran weight | worsted weight | 20 sts to 4 inches |
| 12 ply | worsted weight | 16 – 18 sts to 4 inches |
| 14 ply | bulky | 14 sts to 4 inches |
Steel Hook Chart (thread hooks)
Metric USA UK
.6 mm 14 6
.75 mm 13 -
.70 mm 12 5
.8 mm 11 -
1 mm 10 4
1.15 mm 9 -
1.25 mm 8 3
1.50 mm 7 2.5
1.6 mm 6 -
1.7 mm 5 -
1.75 mm 4 2
1.85 mm 3 -
1.95 mm 2 -
2 mm 1 1
2.25 mm 0 00
3 mm 00
Crochet terms
US UK
chain(ch) chain(ch)
single crochet (sc) double crochet (dc)
double crochet (dc) treble (tr)
half double crochet (hdc) half treble (htr)
triple crochet (trc) double treble (dtr)
slip stitch (sl st) slip stitch (sl st)
Crochet Hook Conversion Chart
Metric USA UK
2.00 mm - 14
2.25 mm 1 / B 13
2.50 mm - 12
2.75 mm C 11
3.00 mm - 11
3.25 mm D 10
3.50 mm 4 / E 9
3.75 mm F -
4.00 mm 6 8
4.25 mm G -
4.50 mm 7 7
5.00 mm 8 / H 6
5.50 mm 9 / I 5
6.00 mm 10 / J 4
6.50 mm 10 1/2 / K 3
7.00 mm - 2
8.00 mm - 0
9.00 mm 15 / N 00
10.00 mm P 000
15.75 mm or 16mm Q -
