Beginner’s Guide to knitting yarn weights and needle sizes

Need to convert from UK to metric or US needle sizes? Want to know the difference between DK and aran weight yarn? We've got all the information you need right here!

UK to US knitting needle conversion

Choose the right tools for every project with our guide to yarn weights, and UK/US conversion charts for yarns and knitting needles.

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If you’re looking for knitting abbreviations, click here.

Yarn weights

1, 2 and 3ply

Knit on 2 to 3.5mm needles. Use for delicate lace knitting and baby garments. Good for socks and gloves.

1, 2 and 3 ply yarn

4ply

Knit on 3 to 4mm needles. Great for baby clothes, heavier socks and lightweight tops.

4ply yarn

Double knitting (DK)

Knit on 3.5 to 4.5mm needles. Usually double the weight of 4ply, this is the most widely used weight. Suitable for most garments and quick to knit up.

Double knitting DK yarn

Aran

Knit on 4 to 5.5mm needles. Originally created for fishermen’s jumpers. Use when DK isn’t heavy enough, and chunky is too bulky. Perfect for outdoor or warm clothing.

Aran yarn

Chunky

Knit on 5.5 to 7mm needles. Associated with outdoor wear and winter jumpers, great for oversized garments.

Chunky yarn

Super chunky

Knit on 7 to 12mm needles. A great weight for beginners, as it produces quick results. Good for furnishings.

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Super chunky yarn

Big

Knit on 9 to 20mm needles. Perfect for eye-catching scarves and coats, as well as cosy cushions and throws.

Big yarn

Yarn weight UK/US conversion

UK
US
4ply
Sport
Double knitting
Light worsted
Aran
Fisherman/Worsted
Chunky
Bulky
Super chunky
Extra bulky

Knitting needle conversion chart

UK
14
13

12
11
10

9
8
7
6
5
4
3
2
1
0
00
000



Metric
2mm
2.25mm
2.5mm
2.75mm
3mm
3.25mm
3.5mm
3.75mm
4mm
4.5mm
5mm
5.5mm
6mm
6.5mm
7mm
7.5mm
8mm
9mm
10mm
12mm
15mm
20mm
25mm

US
0
1

2

3
4
5
6
7
8
9
10
10½


11
13
15
17
19
36
50