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Knitting Needle Conversion Chart

The knitting needle comparison chart below shows the present metric sizes, used in UK modern day knitting patterns (written in red).   

If you are using a UK vintage knitting pattern, you may find it quotes UK imperial size hooks, (written in grey).


I have also included USA equivalent sizes (written in blue).

Scroll down to the bottom of the page to see UK and USA yarn weight equivalents.


UK - Metric (Present Day) Sizes
UK - Old Imperial (Vintage) Sizes
USA Sizes
2mm
14
0
2.25mm
13
1
2.5mm
 -
  -
2.75mm
12
2
3mm
11
 -
3.25mm
10
3
3.5mm
 -
4
3.75mm
9
5
4mm
8
6
4.5mm
7
7
5mm
6
8
5.5mm
5
9
6mm
4
10
6.5mm
3
10½
7mm
2
 -
7.5mm
1
 -
8mm
0
11
9mm
0
13
10mm
0
15
12mm
 -
17
15mm
 -
19
20mm
 -
36
25mm
 -
50

UK and USA Yarn Weight Equivalents

UK Yarn Type
USA Yarn Type
4 ply
Sport
Double knitting
Light worsted
Aran
Fisherman / Worsted / Medium
Chunky
Bulky
Super Chunky
Super Bulky