Crochet Hook Sizes report

Crochet hookMost people do not know what the crochet hook is. You may only see it in your grandparents' home. A crochet hook is a handheld tool that helps create stitches with yarn. Crochet hooks come in many sizes and are made of different materials and varieties. Most hooks have the size listed on the thumb area of the hook, which is the diameter of the shaft of the hook in mm.

Knowing about crochet hooks will help you determine what size crochet hook is best for a pattern and what type of hook is best to use. Beginner crocheters are often eager to jump in and start crocheting but do not realize that crochet hook sizing matters in their projects. Changing the size of your needle will change the size and shape of your project. The usual rule of thumb is that the bigger or thicker the yarn, the bigger the hook you will need.

Crochet hook size does matter. So, if you have ever wondered how to choose the right size crochet hook or all the dimensions of a crochet hook, this article will help. You could learn more about crochet hook sizes, hook types, and finding the right hook size for different patterns.

Crochet hook Sizing Guide

Crochet hooks come in many sizes and types. Most beginners use the H/8 (5mm) hook when just starting to crochet. A basic crochet hook may be made from one of several common materials. Aluminum, plastic, and bamboo are very common choices, with many people choosing aluminum crochet hooks for their first set. Fancier crochet hooks may be made of clay, glass, wood, or other materials. Some manufacturers will list some or all of the sizing units directly on the crochet hooks' labels. They are always referenced in either the US or Metric sizes, which you can learn more about below in with the conversion chart.

Crochet hook Sizes

Crochet Hook Size Conversion Chart

Metric (AUS / NZ) Size

UK / Canadian Size

US Size

Japan Size

2.00mm

14

0

2/0

2.25mm

13

B/1

3/0

2.50mm

-

C/2

4/0

2.75mm

12

C/2

-

3.00mm

11

D/3

5/0

3.25mm

10

E/4

-

3.50mm

-

F/5

6/0

3.75mm

9

G/6

-

4.00mm

8

7

7/0

4.50mm

7

H/8

7.5/0

5.00mm

6

I/9

8/0

5.50mm

5

J/10

9/0

6.00mm

4

K/10 ½

10/0

6.50mm

3

10.75

-

7.00mm

2

-

-

7.50mm

1

L/11

-

8.00mm

0

M/13

9.00mm

00

N/15

10.00mm

000

O/17

12.00mm

-

P/19

15.00mm

-

Q/19

20.00mm

-

S/35

25.00mm

-

50

Steel Crochet Hook Sizes

Usually, the steel crochet hook was used for crochet threads and lightweight yarns. These metal hooks numbers size decreases when the diameter increases. You can find the different size chart below:

Metric SizeU.S. Size
3.50 mm00
3.25 mm0
2.75 mm1
2.70 mm00
2.55 mm0
2.35 mm1
2.25 mm2
2.20 mm2
2.10 mm3
2 mm4
1.90 mm5
1.80 mm6
1.75 mm4/0
1.70 mm5
1.65 mm7
1.60 mm6
1.50 mm8/7/2
1.40 mm9/8
1.30 mm10
1.25 mm9/4
1.15 mm10
1.10 mm11
1.05 mm11
1 mm12/6
0.95 mm13
0.90 mm14/8
0.85 mm13
0.75 mm14/10
0.60 mm12

Crochet Hook Sizes For Yarn Weight

Yarn WeightRecommended Crochet Hook US Size
0 (lace, thread)
B/1
1 (super fine)
C/2, D/3
2 (fine)
E/4, F/5
3 (light, light worsted)
G/6, H/8
4 (medium, worsted)
I/9, J/10, K/10.5
5 (bulky)
L/11, M/13
6 (super bulky)
N/15

Crochet hook sizing Tips

Crochet hook Sizing

  1. Don’t switch hooks after you start a project. Once you start a project, you must use the same exact hook throughout the entire project due to the sizing differences between materials and manufacturers. Even using a different hook marked the same size can change the outcome of your final project.
  2. Be careful about using different hook sizes when using a kit because you might run out of yarn.
  3. You should match your crochet hook size to your yarn weight. For example, thread and super fine yarns require small hooks, while thicker, bulkier yarns require larger crochet hooks to achieve even stitches.

Before you start crocheting, you must use the right size crochet hook and the correct yarn weight. Depending on the size of the crochet hook, it may be made of plastic, metal, wood, and sometimes even bone. For durability, small hooks tend to be made of steel, while large hooks are usually made of plastic or other lightweight materials. Medium-sized hooks are usually made of aluminum but can also be made of any other material.


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