We Crochet Over 1750 Yarns to choose from

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

If you’re a beginner crocheter, do you understand crochet hook sizes? Not yet? Don’t worry. It’s simple, follow the charts below.

Crochet Hook Sizes Feat Img - Here's what you need to know about hook sizes crochet. No more confusion if you come across a system you're not used to!

Note: If you click a link on this page, and make a purchase, I may receive a commission but at no extra cost to you. Learn More

I’m here to help crocheters like you find the right hook size in this blog article. This is one of the must-know topics in crocheting!

I reviewed and updated this post on January 3, 2022.

Table Of Contents

I adore crocheting with Furls hooks. (Made with wood & resin.)
See their website for great project ideas.

How Do You Know What Size To Use?

Here are methods to decide what hook size you need.

  • Yarn Label – Says what hook size to use, in metric and US sizes. (Plus more info on care, fiber content.)
  • Gauge Swatches – Work the swatch with the recommended hook and stitches. Use a smaller hook if it’s too big and a bigger hook if it’s too small
  • Patterns include sizes too. Ask the pattern designer if it doesn’t

Note: Hook sizes (in mm) vary from the crochet hook brands. No standard set size for crochet hooks exists yet. This measurement guide is for reference only.

I know, the inconsistency between each business is a problem, and it can be a challenge to figure out, but I’m here for that!

Don’t change hooks mid-project.

Because of the variety of material and manufacturer differences, use the same hook throughout.

You might run out of yarn if you use different hook sizes when using a kit.

See my post on a crochet hook stand for keeping your tools under control.

What Are All The Sizes Of Crochet Hooks?

It’s essential to know the conversions when using a crochet 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!

(The shaft is the space between the thumb area part, the handle, and the hook.)

Note: I’m not talking about the length of a hook in this post, which is measured from the bottom to the point.

You can convert the diameter of the shaft to United States sizes for these materials. (Uses numbers and letters.)

For example, a US size G hook is 4.25mm in diameter.

  • UK & Canada – numbers
  • Australia & New Zealand – metric sizes

The sizing for this thing in other countries varies.

Choose a system for you, whether metric or letters and numbers.

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

Steel hooks (“thread hooks”) are only used for fine lace thread. (Use them to make doilies for the home or intricate designs!)

They come in numbered sizes, getting larger as the diameter or millimeters get smaller. If the size is big, it’s a sign they’re tiny!

These crochet hooks vary in size from the 0.6 mm thickness of size 12 to the 3.25 mm thickness of size 00.

Crochet Hooks For Yarn Weights

Here’s how to find the right size crochet hook for different sizes of yarn.

  • 0 (Lace Crochet, 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 Yarn Weight) – N/15

Need a fiber weights chart? See here.

Want some tutorials on finding the correct size? See these ones. They included pictures to help you.

Crochet Hook Conversion Chart

Hope you find this crochet hook size chart on all the sizes helpful!

This crochet hook size conversion is for regular crochet hooks, knook hooks, and all categories of Tunisian crochet hooks.

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 mmG/68
4.25 mmG
4.50 mmUS77
5 mmH/86
5.50 mmI/95
6.00 mmJ/104
6.50 mmK/10.53
7.00 mm2
8 mmL/110
9 mmM/1300
10 mmN/15000
11.50 mmP/16
15.75 / 16 mmQ
19 mmS

(These Size Charts Are Based On Standards From The Craft Council.)
(They also have sizes for knitting needles.)
Crochet Hook Sizes Chart
Share this image, but link back to this post of conversion charts with credit.

Download A Handy PDF Of This Hook Size Chart

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

I will show you how to find the best online yarn shop in my guide.

Crochet Thread Hook Sizes / Steel Hook Crochet Sizes

These needle sizes are for thread crochet hooks, used for thread crocheting.

For the best steel hooks on the market, my recommendations are the Clover Amour line or Susan Bates. These things have excellent reviews, and are best-sellers!

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

(These Measurements Are Based on the Craft Yarn Council’s standards.)
(They also have standards for knitting needle sizes.)

Steel Crochet Hooks Sizes Chart
Share this image, but link back to this post of conversion charts with credit.

Download A Handy PDF Of This Hook Size Chart

How Do You Know What Size Crochet Hook To Use?

Choosing the right-sized crochet hook follows a process.

Most crochet patterns have suggested pattern gauge information with a specific crochet hook. This shows how many stitches you should have per inch.

Do a swatch of about 4 inches in the stitch pattern you use in your crochet project.

Wash your swatch, let it dry and measure your stitches. Super crucial for crocheting items such as a sweater or top.

Suppose your square is smaller than what the pattern calls for. Size up a hook. Or down one of the crochet needle sizes if your square is too large.

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

(Note: Inline and tapered hook sizes vary, as the area between the thumb grip and hook differs.)

You’ll find a crochet hook size to suit the crochet projects you make. It takes a while to decide on your first set of crochet supplies, but it gets easier!

Once you get your sizes sorted, I’ll help you find the best crochet hook set.

Some brands and hook manufacturers don’t produce hooks in all sizes. Know what each craft store makes so you have the right hooks or crochet hook set.


Have a question? I’ve got answers!

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 used for many projects.

What Is The Best Size Crochet Hook For Beginners?

The best size crochet hook for beginners is size 5.0mm. It’s big enough to hold but not cumbersome. It also fits yarns perfect for people learning to crochet!

Regarding crochet hook types, try aluminum crochet hooks as a start. Bamboo is too grippy to work with for beginners.

When you level up in skill, try it! You’ll be pleasantly surprised, as it’s smooth and warm to the touch.

Is My Crochet Hook Too Big?

Here’s an easy method.

Test your hook size by crocheting a test swatch and measuring it. A pattern specifies the crochet stitches per inch.

  • Smaller hook – it will create stitches that are tighter
  • Larger hook – it will create stitches that are looser

But you can adjust the pattern as necessary. You might want smaller stitches in scarves for winter.

Here’s a tutorial. (Check out her other great crochet guides with helpful images and charts.)

A 2.75 mm hook Is What Letter?

Crochet needles of this size are equivalent to a US hook size C/2.

How Does Hook Size Affect Crochet?

The smaller the hook size creates stitches with smaller yarn gaps and tighter connections between the loops. For a bigger crochet hook, the opposite is true.

The yarn thickness also affects the finished product.

What Happens If A Hook Has No Label?

Here are ways to determine your hook size from your collection. Using a ruler, measure the shaft and convert the Metric millimeters to US sizes. Get a gauge or measuring tool.

Slide the hook you use into a hole until it fits.

Which Crochet Hook Is Size P?

A size P hook is 15mm. However, some brands label P types of crochet hooks as 10mm.

What Happens If I Use A Bigger Crochet Hook?

The gauge is larger, making a bigger finished item. If you use a big hook on crochet threads, you end up with a loose creation.

What Size Is A 2.5 mm Crochet Hook?

It’s still a 2.5mm crochet hook in US sizing. In UK/Canada sizing, these types of crochet hooks are 12.

What Is A Size G Crochet Hook?

A size G crochet hook in US sizing 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 seven and a size 7 in the UK & Canada are the exact sizes, but 4.50mm in metric.

In US Sizes, What Is 3.00mm?

A D/3 crochet hook. Some companies use D on 3.25 mm crochet hooks.

What Is A Size 8 Crochet Hook?

Also known as size hook 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?

The best size crochet for a project idea like a blanket is an H/8 (5mm) size hook. However, it depends on the yarn and your fiber preference.

5/5.5mm for Sport or DK weight yarn.

Using something chunkier, or want a looser look for your afghan? Use the crochet hook size 6/6.5mm.

Aluminum crochet hooks are excellent for these projects. A great company that makes them is Susan Bates.

What Size Crochet Hook For 4ply Wool?

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

Come back to this post whenever you need to use the crochet hook sizes conversion chart. You shouldn’t have to remember everything! Have fun with your next project.

Assist each other, friends, and future readers by sharing this post of crochet hook size charts. Happy crocheting!

Need help with hook sizing or downloading your crochet hook size chart? Use your email address to leave a comment with your questions.

Connect with me on social media, like Facebook or Instagram.

Next > Black Friday Yarn Sale

Pin Now to Save for Later

Crochet Hook Sizes Pin

READ NEXT – Want info on the types of crochet hooks? See here.

Has this post helped you? Support me here!

About Jodie Morgan

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

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

Please say hello!

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

  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.

    • Hi Teresa. The Woobles said: “Use bigger yarn. The size of the yarn determines how big or small it will be.” Cheers Jodie

  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.

  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!

    • Hi Angie. That’s frustrating. There are some brands with letter sizing, but not the same mm sizing. Could you try a different hook? Mark the mm size on the H Hooks with different mm sizes. Cheers Jodie

  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

    • Hi Monica. King Cole Comfort Chunky doesn’t list a hook size. It may tell you gauge. Check your gauge by crocheting a swatch with the 7mm hook. Increase hook size if gauge swatch is smaller than desired. If your gauge is larger than desired, use the 6.5mm hook. Everyone has different tensions, so it may take some practice. Cheers Jodie

  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.

    • Hi Debbie. Substitute a steel crochet hook #2 for a B1 hook. MM size must be the same. Check by swatching. More work is required, but it makes a difference. Cheers Jodie

  6. Thanks for this helpful website.
    My project involves crocheting recycled polyester cord – 3mm diameter or 6 mm diameter. Is the hook size the same as the diameter of the cord? What size hooks would I need? I’m not working from a pattern – just making my own.
    Thanks for your help!

    • Hi Catherine. The hook size depends on your project. Use a larger diameter hook for a looser texture, a smaller diameter hook for a tighter texture. Can you test any hooks? For a 3mm diameter cord, pick a 4mm or a 6mm hook. Pick an 8mm hook for a 6mm cord. Cheers Jodie

  7. Hello,
    I’m French and I have a hook size 26 made in England.
    I don’t find the conversion in MM. Can you help me?
    Have a nice day.

    • Bonjour Françoise. Comment allez vous? I practice French every day, but I’m still learning! Lay out a metric measuring tape flat on the table. Measure the shaft section between two mm bars on the measuring tape. Count the number of mm bars your hook occupies starting at the 2cm mark on the tape. This gives you an idea of the diameter in mm. Cheers Jodie


Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.