Crochet Hook Size Chart + How to Pick the Right Size

Home » Blog » Crochet Hook Size Chart + How to Pick the Right Size

When it comes to crochet, crochet hook size matters! Have you ever seen a number, a letter, or a metric value (or maybe all three) stamped on your crochet hooks? These are the codes manufacturers use to tell you how big or small the hooks are, and here’s the kicker: these codes can be different from one brand to another. It can get confusing!

This handy guide is your trusty companion. Bookmark this page and use it whenever you come across a pattern that uses a hook size you’re not familiar with.

UPDATED: DECEMBER 18, 2023 BY BRITTANY
This post may contain affiliate links.

Different crochet hook sizes of Furls Odyssey
Furls Odyssey Crochet Hooks (Discontinued): Read the Review Here

This guide was made to clear up all your questions about crochet hook sizes. Keep in mind, that the size of your crochet hook isn’t only about the yarn it works with – it also affects how your project turns out. If you use a small hook with a thicker yarn, you’ll get a firmer, denser fabric. But if you go for a big hook with a thinner yarn, your project will have a looser, airier feel.

Here’s a quick overview of the topics we will cover in this article:


What are Common Crochet Hook Sizes?

The size marked on your crochet hook will mostly depend on where it was made. However, there’s a straightforward conversion between the metric size and the US size.

Millimeter sizing is the most precise way to talk about crochet hook sizes because it’s a direct measurement.

But sometimes, you’ll come across patterns that only use a letter or a number. That’s where this crochet hook size chart comes to the rescue. You can either memorize it or bookmark it, whichever works best for you. It’ll help you get familiar with crochet hook sizes, both in the US and in metric measurements.

Use this crochet hook conversion chart any time you need to go from US to metric crochet hook sizing:

Common Crochet Hook Size Conversion Chart

Metric SizeUS Size
2.25 mmB-1
2.75 mmC-2
3.25 mmD-3
3.50 mmE-4
3.75 mmF-5
4.00 mmG-6
4.50 mm7
5.00 mmH-8
5.50 mmI-9
6.00 mmJ-10
6.50 mmK-10 1/2
7 mm(No conversion)
8 mm L-11
9 mmM/N-13
10 mmN/P-15
15 mmP/Q
16 mmQ
19 mmS
25 mmT/U/X
30 mmT/X
For more information or for additional sizes, check out the hooks and needles standards from the Craft Yarn Council.

Why Crochet Hook Size Matters

Different crochet hook sizes create different-sized stitches. Some hooks make your stitches big and open, while others make them small and tight. It’s like having a magic wand to control your fabric!

Tension Matters: The size of your stitches affects something called ‘tension.’ If your stitches are too loose, your project might end up floppy and out of shape. On the other hand, if they’re too tight, your work could be stiff and stubborn.

The Gauge Game: When you follow a crochet pattern, it often mentions a ‘gauge.’ Gauge is basically a fancy word for the number of stitches and rows per inch or centimeter. The right gauge ensures your project turns out the same size as the pattern says. And you want that, right?

By choosing the right crochet hook size, you control your tension, and you can match the pattern’s gauge. That means your finished project will look exactly like the picture in the pattern. No surprises!

Experiment and Learn: Over time, you’ll discover how different hook sizes affect your crochet style. You’ll learn when to use a bigger hook for a lacy shawl or a smaller one for a cozy blanket.

So, remember, those numbers, letters, and millimeters on your crochet hooks are your secret weapons. They let you create the perfect tension and gauge for your projects, and over time you’ll get so comfortable with it you won’t even have to think about it.

Understanding Crochet Hook Size Labels

Crochet hook sizes are simple measurements that show you the size of the hook itself. These sizes make a big difference in how your crochet project will look and feel.

You might have seen numbers, letters, or even metric values stamped on your hooks, and it can be a bit puzzling. But don’t worry; I’m here to break it down for you:

US vs. Metric Crochet Hook Sizes

So, first things first, there are two main systems for labeling crochet hook sizes: the US system and the metric system.

  • US Sizes: In the US system, you’ll often see crochet hooks labeled with letters (like G, H, I) or numbers (like 6, 7, 8). These letters and numbers represent different sizes, but they don’t follow a strict numerical order, so it can feel a bit random.
  • Metric Sizes: In the metric system, crochet hook sizes are measured in millimeters (mm). This one is straightforward. The size tells you exactly how wide the hook is in millimeters.

Now, here’s where it gets a tad tricky – these two systems don’t always match up perfectly. You might find that a US G/6 hook is roughly equivalent to a 4.0mm hook in the metric system.

But don’t sweat it too much. Most crochet patterns will mention both US and metric sizes, so you can use whichever system you’re comfortable with. It’s all about making crochet work for you.

Specialty Crochet Hook Sizes

Also known as steel crochet hooks for thread crochet projects, these tiny hooks bring a whole new world of creativity to your crochet game.

For this delicate art (thread crochet), you’ll need steel crochet hooks. These hooks are slender and come in numbered sizes (like 0, 1, 2, etc.) rather than the usual letters or millimeters. They’re designed to handle the thin threads and create intricate, delicate pieces like doilies and lacework.

Steel Crochet Hook Sizes

Steel Hook SizeDiameter (in Millimeters)
01.75
21.50
41.25
61.00
80.90
100.75
120.60
140.50

Where to Find Them: You might not spot steel hooks in your average crochet hook set. Instead, look for them in specialty stores or online shops catering to crocheters. They often come in sets, so you’ll have various sizes to choose from. This is my favorite set available on Amazon.

Thread crochet lets you create elegant and detailed designs. From dainty tablecloths to heirloom-quality pieces, steel hooks are your ticket to a world of fine craftsmanship. So, if you’re ever in the mood for creating something truly special and delicate, steel crochet hooks are your best friends.

How to Choose the Right Size Crochet Hook

Alright, let’s get down to it – picking the right crochet hook size is key for your crochet journey. It’s a little more involved than simply looking at the yarn label, but it’s quite easy to learn.

Here’s a simple guide to help you make the perfect choice:

1. Yarn Weight Wisdom: Start by checking out your yarn’s weight. Most yarn labels give it away, using words like lace, fingering, sport, worsted, bulky, or super bulky. In a general sense, each of these yarn weights pairs up with a specific hook size.

2. Sneak a Peek at the Label: Take a quick look at your yarn label – it’s like your yarn’s user manual. It usually suggests a hook size to use. This gives you a solid starting point but isn’t the only hook you can use.

3. Project Plans: Think about what you’re crafting. Different projects might call for different hook sizes, even if they’re using the same yarn weight. For example, an airy shawl might need a bigger hook than a tightly stitched amigurumi.

4. Check the Pattern: If you’re following a crochet pattern (which can be a lifesaver!), look for any specific hook size recommendations. Always stick to what the pattern says, and only modify if you can’t match the gauge with the recommended size.

5. Gauge It Out: Crochet a small test swatch using the recommended hook size. This lets you see if your stitches match what the pattern wants. If they’re too tight, try a bigger hook; if too loose, go a bit smaller. Here’s a really helpful article I wrote about gauge if you’re not sure how to do this.

6. Fabric Feelings: Consider how you want your finished piece to feel. A larger hook with thinner yarn creates an open, airy fabric, while a smaller hook with thicker yarn makes it tighter and denser.

7. Your Crochet Comfort Zone: Your unique crochet style matters. Some folks naturally crochet tighter or looser. Go with a hook size that feels comfy and gets you the result you want.

8. Play with Sizes: Don’t be shy to experiment with different hook sizes. Sometimes, a slight change from the recommended size adds a special touch to your work. And it may be required to achieve the gauge you need when following a pattern!

9. Keep Track: Make a little crochet diary or notes about the hook sizes you’ve used for different yarns and projects.

10. Flexibility Rules: If things aren’t working out, don’t hesitate to switch hook sizes mid-project. You can always start over and try another size.

By following these simple steps, and with a little bit of practice, you’ll become a pro at choosing the right crochet hook size. And remember, practice makes perfect!

Tips for Choosing the Right Hook Size for Your Project

Episode Sponsored by Lion Brand Yarn
Video not displaying? Watch this episode on YouTube instead.

Choosing Between Inline and Tapered Crochet Hooks

There are two types of crochet hooks; inline and tapered. Each has its own unique advantages, and choosing the wrong one can drastically impact your crocheting experience.

Inline Crochet Hook
Tapered Crochet Hook

Inline Crochet Hooks

These hooks have a head and shaft that are in line with each other, creating a straight and uniform look. Here’s why you might love them:

  • Pencil Grip” Hook of Choice: Inline hooks are great for those who prefer to hold the hook with a “pencil grip”. The straight shaft ensures that your loops stay put when working the stitches in this crochet style.

Tapered Crochet Hooks

Tapered hooks, on the other hand, have a gradually tapered shaft. Here’s why they might be your cup of tea:

  • Knife-Grip” Hook of Choice: Tapered hooks offer a smooth glide through your stitches for those who hold the hook with a “knife grip”.

So, which one should you choose? Well, it’s a bit like choosing the right brush for a painting. It depends on your personal style and your comfort level.

Some crocheters swear by one style, while others love to switch between the two depending on their project. It’s all about finding what feels right for you. Try both inline and tapered hooks, and see which one feels the most natural to you.

Remember, there’s no right or wrong choice here – it’s all about your preference.

How to Read a Pattern for Crochet Hook Sizes

First things first, crochet patterns are like your trusty roadmaps in the crochet world. They tell you what to do step by step. Somewhere near the beginning, you’ll find a section that lists all the tools you need. And right there, you’ll spot the hook size.

The pattern might mention hook sizes in different ways. You could see numbers (like 5.0mm), letters (like H/8), or even both (like G/6 (4.0mm)).

Once you’ve found the hook size, use that to check your gauge, and use that hook throughout your project if your gauge matches. If the gauge doesn’t match, you’ll need to switch to a different hook size and swatch again. Here’s a rule of thumb:

  • If you count fewer stitches per inch, drop down a hook size and swatch again.
  • If you count more stitches per inch, go up a hook size and swatch again.

So, when you’re staring at your next crochet pattern, don’t let those numbers and letters intimidate you. They’re there to guide you.

Crochet Hook Materials and Their Impact

It’s time to explore the world of crochet hook materials and how they can truly impact your crochet experience. Trust me; the material your hook is made of can make a world of difference:

Aluminum Hooks: Aluminum hooks are the trusty workhorses of the crochet world. They’re lightweight, smooth, and glide effortlessly through your yarn. Perfect for most projects, these hooks are reliable and comfortable to use.

Steel Hooks: If you’re diving into thread crochet, say hello to steel hooks. They’re thin, sturdy, and ideal for those delicate, lacy creations. Thread crochet is like crafting delicate lace, and steel hooks are your fine-tuned instruments.

Wooden Hooks: Wooden hooks add a touch of natural warmth to your crochet. They’re lightweight, gentle on your hands, and provide a comfortable grip. It’s a more “grippy” material, so it’ll hang on to the yarn more than aluminum hooks will.

Plastic Hooks: Plastic hooks are great for beginners or when you need a cost-effective option. They’re lightweight and easy on your hands. It’s a “grippy” material so they’re great trainers for beginners who struggle to hold on to the yarn when making stitches.

Ergonomic Hooks: Now, if comfort is your game, check out ergonomic hooks. These beauties come with cushioned handles that reduce hand fatigue. They’re like the cozy armchairs of crochet hooks, and I honestly couldn’t crochet without them.

Fancy Materials: You might even stumble upon hooks made from unique materials like bamboo, glass, or even ceramic. These can add a touch of luxury and flair to your crochet if you’re into this sort of thing.

Impact on Comfort

The material you choose can affect how comfortable your crochet sessions are. So, think about your preferences. Do you like the cool touch of metal, the warmth of wood, or the soft grip of plastic?

Over time, you might find that you develop a personal connection with a certain material, but it’s important to experiment with as many hook materials as you can find to make this connection.

Maintaining Your Crochet Hooks

We’ve covered a lot of ground, but there’s one last thing you need to know to keep your crochet hooks in tip-top shape.

Cleanliness is Key: Your hooks can get dusty or sticky over time, especially if you’ve been working with different yarns. Give them a gentle wipe with a damp cloth or a baby wipe to keep them clean and smooth.

Mind the Material: Different hook materials require different care. Wooden hooks might appreciate a bit of conditioning with wood oil to keep them from drying out. Metal hooks, on the other hand, usually just need a wipe-down.

Avoid Rust: If you’re using metal hooks, be extra careful about moisture. Rust can be a hook’s worst enemy. Store them in a dry place, and if they do get wet, make sure to dry them thoroughly.

Store Properly: Speaking of storage, keep your hooks organized. A crochet hook case or pouch is like a cozy home for your hooks. Plus, it makes it easier to find the right one when you need it.

Know When to Say Goodbye: Sometimes, hooks can wear out over time, especially if you crochet a lot. If you notice that a hook has become too rough or uncomfortable to use, it might be time to retire it and replace it with a shiny new one.

Remember, your crochet hooks are like your companions on this crafting journey, and taking good care of them ensures they’ll be with you for many more projects to come.

Frequently Asked Questions About Crochet Hook Sizes

What do the letters and numbers on crochet hooks mean?

The letters and numbers on crochet hooks represent their sizes. Different systems like US and metric use various labeling methods to indicate hook sizes.

How do I choose the right crochet hook size for my project?

Consider your yarn weight, project type, and desired fabric texture when choosing a hook size. Start with the recommended size in your pattern or on your yarn label.

What’s the difference between a US and metric crochet hook size?

US crochet hooks use letters and numbers, while metric hooks are measured in millimeters. Conversion charts can help you switch between these systems.

Can I change the crochet hook size in a pattern?

Yes, you can adjust the hook size, and you should change hook sizes if your gauge doesn’t match the pattern. Changing hook sizes will affect the project’s size and gauge. Make a gauge swatch to check the impact on your final piece.

What are specialty steel crochet hooks used for?

Steel crochet hooks are ideal for thread crochet projects, such as doilies and lacework, where you work with fine threads and need precision.

What’s the difference between inline and tapered crochet hooks?

Inline hooks have a straight shaft and are known for consistency, while tapered hooks have a gradually tapered shaft and offer smooth stitching. Your preference depends on your crochet style and comfort.

Do different materials of crochet hooks make a difference in my crochet experience?

Yes, different materials like aluminum, wood, and plastic can impact your comfort and the way your stitches glide. Choose the material that suits your preferences.

Can I use any crochet hook size with any yarn weight?

It’s essential to match your hook size with your yarn weight for the best results. Using the wrong size can lead to uneven tension and project sizing issues.

More Topics to Learn About


*Disclosure: Some of the links in this post are affiliate links, which means as an Amazon Associate, I earn from qualifying purchases made through these links. Please note that prices and availability of products are subject to change. This comes at no additional cost to you and helps support the content on this site. I only recommend products that I have personally used and genuinely believe in. Thank you for your support!