A Guide to converting needle size from Metric to UK and US sizes

Metric Sizes

UK Sizes

US Sizes

2.0 mm 14 0
2.25 mm 13 1
2.75 mm 12 2
3.0 mm 11
3.25 mm 10 3
3.5 mm 4
3.75 mm 9 5
4.0 mm 8 6
4.5 mm 7 7
5.0 mm 6 8
5.5 mm 5 9
6.0 mm 4 10
6.5 mm 3 10 1/2
7.0 mm 2
7.5 mm 1
8.0 mm 0 11
9.0 mm 00 13
10.0 mm 000 15
12.0 mm 17
16.0 mm 19
19.0 mm 35
25.0 mm 50

A rough guide to yarn weight conversions

* approximate conversions as some weights do overlap.

Super Chunky Super Bulky
Chunky Bulky
Aran Aran / Worstead
DK Worstead / Sport
4 ply / Sock Sport / Fingering
3 ply / Sock Baby
Lace Lace
Cobweb Cobweb

Crochet stitch conversions

Be sure to check if you are working from a crochet pattern that you are using the correct stitch, US and UK patterns use different names for the stitches!

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)