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Crochet Hook Sizes – Handy Size Chart & All The Sizing Facts

There are many techniques to learn in crochet. Understanding crochet hook sizes are just part of the knowledge you need to acquire. Don’t worry. It’s simple, and the charts below will help you.

For a comprehensive look at all things hooks, please visit my post – Crochet Hooks – My Complete Guide To All The Different Types & Styles.

Crocheting is such a wonderful craft, full of creative stitches, patterns, and beautiful yarns. Knowing about hooks is part of the learning.

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Table Of Contents

What Are All The Sizes Of Crochet Hooks?

Crochet Hook Conversion Chart

Metric/AUST/NZUSUK/Canada
2.00 mm14
2.25 mmB/113
2.50 mm12
2.75 mmC/211
3.125 mmD
3.25 mmD/310
3.5 mmE/4
3.75 mmF/59
4.00 mmG/68
4.25 mmG
4.50 mmUS77
5.00 mmH/86
5.50 mmI/95
6.00 mmJ/104
6.50 mmK/10.53
7.00 mm2
8.00 mmL/110
9.00 mmM/1300
10.00 mmN/15000
11.50 mmP/16
15.75/16 mmQ
19 mmS
(Based On Standards From The Craft Council)
Crochet Hook Sizes Chart
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Download A Handy PDF Of This Chart

New Tools from The Hook Nook. An assortment of Hook Nook tools and hooks on a blue background

Crochet Thread Hook Sizes / Steel Hook Crochet Sizes

MetricUS
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
(Based on the Craft Yarn Council’s standards.)
Steel Crochet Hooks Sizes Chart
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Download A Handy PDF Of This Chart

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As you can see from the chart, the hook size varies from place to place. It’s important to know the conversions. Helpful when you want to crochet a pattern written in another country.

The diameter of a hook shaft determines the size of the hook and the size of the stitches. Hook sizes are measured in millimeters and are available from as small as 2 mm to 20 mm or bigger!

Hooks can be labeled with US sizes, which uses numbers and letters. A US size G hook is 4.25mm in diameter. In the UK and Canada, they also use numbers.

Australia and New Zealand use metric sizes. The chart above is a great reference for comparison.

Usually, the bigger or thicker the yarn, the bigger hook you need. Chunky wool uses a bigger crochet hook.

Steel hooks are also known as “thread hooks” and should only be used for fine lace thread. They come in numbered sizes that get larger as the diameter or millimeters gets smaller.

These crochet hooks vary in size from the 0.6 mm thickness of size 12 to the 3.25 mm thickness of size 00. You can find conversion for thread hooks above.

How Do You Know What Size Crochet Hook To Use?

Choosing the right sized crochet hook follows a process.

In most crochet patterns, they have a suggested gauge with a certain crochet hook. This shows how many stitches you should have per inch.

You should do a swatch of about 4 inches in the stitch pattern you’re going to use in your project. Wash your swatch, let it dry and measure your stitches. Super important for crocheting items such as a a sweater or top.

If your square is smaller than what the pattern calls for, size up a hook. Or down a size if your square is too large.

If you’ve bought yarn and don’t have a pattern in mind, the label has a suggestion for the hook size to use and also what gauge you should get. 

You’ll find a crochet hook size to suit the projects you make.

Some brands don’t produce hooks in the sizes, so it’s helpful to know what they do make so you can have the right hooks from your favorite brands.

Types Of Crochet Hooks

The types of crochet hooks vary not only in size but in materials they’re made from. I go into more detail in my Hooks Guide. Below is an overview.

Steel: These crochet hook sizes are the smallest. Refer to the chart above. Used for fine thread crocheting, such as doilies.

Aluminum: The most popular hook choice because the yarn glides smoothly.  Aluminum crochet hooks are available in a large range of sizes. 

Plastic: Available in a wide range of sizes. Great for beginners because they are cost-effective. 

Bamboo: Available in many sizes but not the smallest sizes. The largest is 25mm.

Wood: Wood is used to make crochet hooks as well. They often have beautifully carved handles or are just a regular shape.

Tunisian: Longer than a standard crochet hook. This means more stitches can be held on the hook as you work. 

Ergonomic: The specially designed shape of the handle is to reduce the strain in your working hand. 

The Knook: A long crochet hook with a hole through one end. You thread a piece of yarn through the hole. You can create stitches looking like knitting.

Your Questions Answered

What Is The Most Common Crochet Hook Size?

A G/H crochet hook, (a 6 in Canada and the UK, and 5.00mm in metric,) is excellent for beginners. It’s also used for all sorts of projects

How Does Hook Size Affect Crochet?

The smaller the hook size, the smaller the yarn gaps and the tighter the connections between the loops. For a bigger crochet hook, the opposite is true. Keep in mind the yarn weight also affects the finished product.

What Happens If I Use A Bigger Crochet Hook?

The gauge will be larger, thus making a bigger finished item.

What Size Is A 2.5 mm Crochet Hook?

It’s still known as a 2.5mm crochet hook in US sizing, as there is no direct equivalent. In UK/Canada sizing, it’s 12.

What Is A Size G Crochet Hook?

In US sizing, a size G crochet hook is also known as 6. In metric, it’s 4.00mm, and in the UK & Canada, it’s 8.

What Is A Size 7 Crochet Hook?

A US size 7 and a size 7 in the UK & Canada are the same size, but it’s 4.50mm in metric.

What Is A Size 8 Crochet Hook?

Also known as size H in the States, it’s a 6 in Canada and the UK and is 5.00mm in metric sizing.

What Size Crochet Hook For Blanket?

Generally, the best size crochet for a blanket is H/8 (5mm). However, it depends on the yarn weight of the yarn you’re using.

What Size Crochet Hook For 4ply Wool?

The best size crochet hook for 4ply wool is 2.50mm – 3.00mm, US E/4, and 12-9 for UK/Canada.

Come back to this post whenever you need to use the Crochet Hook Sizes conversion chart. Happy Crocheting!

Something I forgot? Or have a question? Leave a comment at the end.

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About Jodie Morgan

Hi. I’m Jodie Morgan, owner and creator of Crochet Penguin. (Yes, I’m a real person :) )

Thanks for being here. I created Crochet Penguin to help show 1,000,000 people the benefits of crochet & highlight alternatives to fast fashion.

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13 thoughts on “Crochet Hook Sizes – Handy Size Chart & All The Sizing Facts”

    • Hi Kathy. Thanks for getting in touch. A 1.25mm crochet hook is what’s known as a steel crochet hook. The corresponding number is 9/4. Cheers Jodie

      Reply
  1. Hello my name is Teresa. My daughter wants me to crochet a penguin for her but the finished size is 9inch she wants it bigger so how can I make a penguin about 20 inches. Thanks for any help you can give me.

    Reply
    • Thanks for getting in touch Teresa. That’s a good question regarding how to adjust a crochet pattern to make it longer. I’ll ask other crocheters more knowledgeable than me. I am not an expert in adjusting crochet patterns. I will get back to you. Cheers Jodie

      Reply
    • Hi Teresa. The team at The Woobles who create adorable Crochet Penguin patterns said this ” The trick to making a bigger amigurumi is to use bigger yarn. The size of the yarn will determine how big or small the penguin will be 🙂
      Hope that helps. Cheers Jodie

      Reply
  2. Just letting you know that you have 2 different sizes for a G hook in 2 different places. One says that in the US a G hook is 4.25 mm and in another place it says a G hook is 4.00 mm. Clarification is needed. A G hook is generally 4.00 mm and 4.25 mm is considered a 7. HOWEVER, if you use Boye hooks, a G is 4.25 mm. It is definitely a good idea to always make a gauge swatch. In the absence of a gauge being given for the project, it may be a good rule of thumb to either always go by the mm sizing OR choose a brand and stick with that brand. It’s a lesson I learned the hard way as I have multiple brands and just discovered the difference in size G between Boye and Susan Bates. Unfortunately I didn’t keep the hook with the project so now I don’t know which G hook I was using and it makes a big difference.

    Reply
    • Hi Lynn. Thank you so much for taking the time to share your helpful information regarding hook sizes, particularly the differing G Hook mm sizing depending on the brand. You’ve given some excellent tips here based on your experience which is very helpful. Thank you. Cheers Jodie

      Reply
  3. HI! I have 3 different H hooks…. all 5mm… and in actuality, they are each a different size. One of them is about an I hook and one is @ a G 4.25…. I lost my favorite H hook that I use all the time… so this is frustrating with keeping my sizing the same…. any suggestions?
    Thank you!

    Reply
    • Hi Angie. That is very frustrating. I’ve heard from other crocheters that sometimes different brands have the letter sizing but then they don’t correspond with the same mm sizing as you have found. Is it possible to replace your favorite H Hook? With the H Hooks that you have but are different mm sizes, I’d mark them with the mm size. Can you put a small piece of tape with permanent marker of the size somewhere on the handle? Cheers Jodie

      Reply
  4. I want to make a cow blanket the pattern says King Cole comfort chunky, 1 skein = 100 g.
    What size crochet hooks should I use in uk. Is size 7 mm and 6.5 mm the right ones to use?m

    Reply
    • Hi Monica. I’ve taken a look at the King Cole Comfort Chunky and it is not giving a hook size only needle size of 6mm-8mm. The cow blanket pattern will hopefully give you the gauge. I’d suggest crocheting a swatch using the stitch pattern given with the 7mm hook and see if you are close to what the pattern gauge says. If your gauge swatch is smaller than desired, or has more stitches and rows per inch than the designer’s sample, you’ll need to increase your hook size.
      If your gauge swatch is bigger than desired, or has fewer stitches and rows per inch than listed in the crochet pattern, then go down to the 6.5mm hook. It might be a bit of trial and error Monica as we all have different tension in our crochet technique. Let me know how you get on.

      Reply
  5. Hi Jodie,
    Can I use a steel crochet hook # 2 for a B1 hook as long as they have the same mm. size? Thank you for the help.
    Debbie

    Reply
    • Hi Debbie. Using a steel crochet hook #2 as a substitute for a B1 hook could work. As long as they are the same mm size. I always recommend doing a swatch for the pattern to make sure the hook you are using gets the gauge you need. It does mean more work but it makes all the difference to the result of your project. Cheers Jodie

      Reply

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