Crochet Conversion Tables: Your guide to crochet hook sizes in US, UK, Australia and New Zealand

Published on August 28, 2026

Around the world, there are slight differences in terminology for hook sizes and yarn weights. So, if you're stuck on what hook size to use for a yarn or pattern, read on! LoveCrafts' handy conversion charts will help you choose the right crochet hook for your next project. Keep these charts close by to clear up any confusion! Print this page

Crochet hook size

Metric	US
2.25 mm	B-1
2.75 mm	C-2
3.25 mm	D-3
3.50 mm	E-4
3.75 mm	F-5
4.00 mm	G-6
4.50 mm	7
5.00 mm	H-8
5.50 mm	I-9
6.00 mm	J-10
6.50 mm	K-10.5
8.00 mm	L-11
9.00 mm	M-13
10.00 mm	N-15
12.00 mm	P-16
15.00 mm	P/Q
16.00 mm	Q
19.00 mm	S
20.00 mm	S

Steel crochet hook size

Metric	US
0.50 mm	18
0.60 mm	16
0.75 mm	14
0.85 mm	13
1.00 mm	12
1.10 mm	11
1.25 mm	10
1.50 mm	8
1.65 mm	7
1.75 mm	6
1.90 mm	5
2.00 mm	4

Yarn weights and required hook size

UK	US	AUS	Hook size
Lace	1 Ply	2 Ply	1.50-2.25 mm
Fingering	2 Ply	3 Ply	2.25-3.50 mm
Sport	4 Ply	5 Ply	3.50-4.50 mm
DK	DK	8 Ply	4.50-5.50 mm
Worsted	Aran	10 Ply	5.50-6.50 mm
Chunky	Bulky	12 Ply	6.50-9.00 mm
Super Chunky	Super Bulky	14 Ply	9.00 mm (and above)

Crochet terminology

British	US
Double Crochet	Single Crochet
Treble	Double Crochet
Half Treble	Half Double Crochet
Double Treble	Treble
Triple Treble	Double Treble
Miss	Skip