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Knitting needles (or knitting pins) appear to have different sizes depending on which country you are in and even where your pattern was published. It can be terribly confusing, especially for the novice knitter.

This chart lists the most common metric equivalents for US, "Old US" and "Old UK" needle sizes. Different needle manufacturers may vary from the exact sizes shown; however, ranges of contemporary US needles are generally as shown in the "Contemporary UK/US Metric Range" column.

"Old US" sizes are frequently seen in old yarn company leaflets; since the sizes run opposite of contemporary sizing (under the "Old US" system, the finest needles have the highest size numbers) the giveaway is a sock pattern (or other pattern using fingering-weight yarn) that calls for size 13 needles! Note that the metric measurements of UK sizes differ, so it may be important to know the source of your pattern.

Here is a handy knitting needle conversion chart to help you.

Looking for knitting needles to purchase? Check out our great selection here

Contemporary
US
Contemporary
UK / US
Metric

"Old" US "Old" UK
0000-0000 .5 mm - 24
000-000 0.75 mm - 22
- 0.875 mm (?) - 20
000-00 1 mm 18 (steel dpn) 19
- 1.125 mm 17 (steel dpn) -
00-00 1.25 mm 16 (steel dpn) 18
000 1.5 mm 15 (steel dpn) 17
- 1.625 mm (?) - 16
00 1.75 mm 14 (steel dpn) 15
0 2 mm 0 (standard needles)
13 (steel dpn)
14
1 2.25 mm 12 (steel dpn) 13
1.5 2.5 mm 1 (standard needles) -
2 2.75 mm 2 (standard needles)
11 (steel dpn)
12
2.5 3 mm 3 (standard needles)
10 (steel dpn)
11
3 3.5 mm - 10
4 3.5 mm 4 (standard needles)
9 (steel dpn)
-
5 3.75 mm 5 (standard needles)
8 (steel dpn)
9
6 4 mm - 8
- 4.25 mm 6 (standard needles) -
7 4.5 mm - 7
- 4.75 mm 7 (standard needles) -
8 5 mm 8 (standard needles) 6
- 5.25 mm 9 (standard needles) -
9 5.5 mm - 5
- 5.75 mm 10 (standard needles) -
10 6 mm - 4
10½ 6.5 mm 10½ (standard needles) 3
10.75 7 mm - 2
10.85 7.5 mm - 1
11 8 mm - 0
13 9 mm - 00
15 10 mm - 000
17 12.75 mm - -
19 15.5 mm - -
35 19 mm - -
50 25 mm - -
Crochet Hook Sizes
U.S. Metric U.K.
0 2 mm 14
B/1 2.25 mm 13
2.5 mm 12
C/2 2.75 mm 12
D/3 3.25 mm 10
E/4 3.5 mm 9
F/5 3.75 mm 9
G/6 4 mm 8
7 4.5 mm 7
H/8 5 mm 6
I/9 5.5 mm 5
J/10 6 mm 4
K/10 ½ 6.5 mm 3
7 mm 2
7.5 mm 1
L/11 8 mm 0
M/N/13 9 mm 00
N/P/15 10 mm 000
12 mm
P/Q 15 mm
Q 16 mm
S 19 mm


Steel Crochet Hook Sizes
U.S. Metric U.K.
16 0.60 mm
14 0.75 mm 7
13 0.9 mm 6 ½
12 1.00 mm 6
11 1.10 mm 5 ½
10

1.25 mm

5
9 1.25 mm 4
8 1.50 mm 3
7
1.65 mm 2 ½
6 1.75 mm 2
5 1.90 mm 1 ½
4 2.00 mm 1
3 2.10 mm 1/0
2 2.20 mm 2/0
1 2.25 mm 3/0
0 2.50 mm 00
00 2.70 mm