Crochet Conversion Tables

Here at LoveCrochet, we want to provide you with all of the beautiful yarns, useful accessories and versatile hooks that you could ever need to complete your project.

Around the world, there are slight differences in terminology for hook sizes and yarn weights, so we've created some handy charts to help 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 Sizes
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