Confused by all the crochet hook sizes out there? We make it easy to understand with our guide!
I remember when I first started crocheting I was a little overwhelmed by all the choices out there. Hooks in all sizes, shapes, handles and materials…. all the different yarn choices and then the notions!
Understanding crochet hook sizes can initially seem daunting, but fear not, I’m here to guide you through the maze. To fully comprehend crochet hooks, it’s crucial to familiarize yourself with the different sizing systems used worldwide: Metric, US, and UK sizes.
Eventually you will become familiar with which hook size goes with what, and now I know most of the US to metric sizes by heart, but that’s not a requirement. As a designer, it’s important for me to list both metric and US on my designs, so I have become familiar with both measurements.
Understanding Crochet Hook Sizes
Metric Sizes
The metric sizing system is the most universally adopted for crochet hooks. In this system, the hook size is determined by the diameter of its shaft in millimeters (mm). This method allows you to pinpoint the exact size you need for your project. For instance, a 2.5 mm crochet hook signifies that the diameter of the hook’s shaft is 2.5 millimeters. Here’s a brief list of common metric sizes:
- 2.0 mm
- 2.5 mm
- 3.0 mm
- 3.5 mm
- 4.0 mm
- 5.0 mm
- 6.0 mm
US Sizes
US crochet hook sizes employ a combination of numbers and letters. Hooks with smaller sizes have higher numbers, and larger hooks have lower numbers. For example, a size B (2.25 mm) crochet hook is smaller than a size I (5.5 mm) crochet hook. To simplify things, here’s a conversion chart of common US sizes to their metric equivalents:
Metric Diameter | US Crochet Hook Size |
---|---|
2.25 mm | B-1 |
2.75 mm | C-2 |
3.25 mm | D-3 |
3.5 mm | E-4 |
3.75 mm | F-5 |
4 mm | G-6 |
4.5 mm | 7 |
5 mm | H-8 |
5.5 mm | I-9 |
6 mm | J-10 |
6.5 mm | K-10.5 |
8 mm | L-11 |
9 mm | M/N-13 |
10 mm | N/P-15 |
12.75 mm | โ |
15 mm | P/Q |
16 mm | Q |
19 mm | S |
25 mm | U |
*Please note that there is no US equivalent for a 12.75 mm crochet hook.
UK Sizes
The UK crochet hook size system is based on standard whole numbers, with smaller numbers representing larger hooks. This system can be slightly more challenging to navigate, but don’t worry, we’ve got you covered with a conversion chart that lists common UK sizes and their metric equivalents:
UK Size | Metric Size (mm) |
---|---|
14 | 2.0 |
12 | 2.5 |
11 | 3.0 |
9 | 3.5 |
8 | 4.0 |
6 | 5.0 |
4 | 6.0 |
With these tables and explanations, you should now have a more comprehensive understanding of the different crochet hook sizing systems. Remember to always check the suggested hook size for your yarn type and pattern to ensure the best results in your crochet project.
Find the free pattern for this blanket here
Factors Determining Hook Size
Yarn Weight
When choosing a hook size, it is important to consider the weight of the yarn you are using. The yarn label typically provides a recommended hook size in both metric and US sizes, as well as information on the yarn’s thickness, fiber content, and care instructions. To ensure the best results for your project, aim to use the suggested hook size for the specific yarn you have chosen.
Yarn Weight | Suggested Hook Size |
---|---|
Lace, Thread | (No. 1) 1.50 mm, (No. 2) 1.50 mm, (B-1) 2.25 mm, 2.50 mm |
Super Fine | (C-2) 2.75 mm, (D-3) 3.25 mm |
Fine | (E-4) 3.50 mm, (F-5) 3.75 mm |
Light, Light Worsted | (G-6) 4.00 mm, (7) 4.50 mm, (H-8) 5.00 mm |
Medium, Worsted | (I-9) 5.50 mm, (J-10) 6.00 mm, (K-11) 6.50 mm |
Bulky, Chunky | 7.00 mm, (L) 8.00 mm, (M/N) 9.00 mm |
Super Bulky | (N/M) 10.00 mm, 12.00 mm |
Jumbo | (P/Q) 15.00 mm, (Q) 16 mm |
Crochet Pattern
Another component to consider when selecting a hook size is the crochet pattern itself. Patterns usually list a suggested hook size to help you create a finished product that closely resembles the original design. Keep in mind that different patterns might require different hook sizes, even if they use the same yarn weight.
It’s a good idea to work a gauge swatch using the recommended hook size and stitch pattern from the pattern. This will help you measure the number of stitches in a row and ensure that your final project turns out as expected.
Personal Preference
Lastly, personal preference plays a role in determining the best hook size for your project. Your individual crochet tension, the feel of the hook in your hand, and your level of comfort with certain sizes can all influence your choice.
To find the right hook size for you, it’s helpful to experiment with different sizes and materials, such as aluminum, plastic, or bamboo hooks. By exploring various options, you can identify your favorites and develop a better understanding of which hooks work best for your particular crochet style and projects.
See our guide to the best crochet hooks for beginners
Some of my personal ergonomic hooks that I use and love
Types of Crochet Hooks
Steel Crochet Hooks
Steel crochet hooks are typically used for finer yarns or threads, such as lace or doilies. They are durable and strong, allowing you to work with finer materials without worrying about the hook bending or breaking. Steel hooks are available in a range of sizes, usually smaller than other crochet hooks.
Aluminum Crochet Hooks
Aluminum crochet hooks are lightweight, smooth, and glide effortlesslythrough yarn. They are a popular choice due to being affordable and easy to find in various sizes. Aluminum hooks are suitable for most types of yarns, but their smooth finish might not be the best choice for slippery fibers.
Wooden Hooks
Wooden crochet hooks are known for their warmth and natural feel in your hands. They provide a comfortable grip and are a great choice for those who suffer from arthritis or other joint conditions. High-quality wooden hooks are polished for smooth use and typically made from materials like bamboo or hardwood.
Plastic Crochet Hooks
Plastic crochet hooks are lightweight and affordable, which makes them an excellent choice for beginners. They come in various sizes and can be more flexible than metal or wooden hooks. However, keep in mind that they might not be as durable, especially when working with thicker or rougher yarns.
Ergonomic Crochet Hooks
Ergonomic crochet hooks are specially designed to reduce stress on your hands and wrists. They typically have a thicker, padded handle for a more comfortable grip, and some come in unique shapes, such as a Y-shaped or paddle handle. They are available in various materials like aluminum, plastic, and wood.
Tunisian Crochet Hook
Tunisian crochet hooks, also known as Afghan hooks, are longer than standard crochet hooks and often feature a stopper at the end to prevent stitches from slipping off. They are used for a specific technique called Tunisian crochet, which creates a dense, knitted-like fabric. Tunisian hooks can be made from different materials like aluminum, wood, or plastic.
Crochet Hook Sizes for Different Projects
Small Hooks and Thinner Yarns
When working with thinner yarns, such as fingering or DK yarn, it’s best to use smaller crochet hooks. These hooks, typically sized D-3 (3.25mm) and smaller, are perfect for delicate projects like intricate lace, doilies, and lightweight garments. In this range, you’ll find hooks labeled with letters, numbers, or millimeters (mm). Here are some common yarn and hook combinations:
- Fingering weight yarn: D-3 (3.25mm) crochet hook
- DK yarn: E-4 (3.50mm) to G-6 (4.00mm) crochet hooks
Using a smaller hook will result in tighter, neater stitches, which is ideal for these types of projects. Remember to always work gauge swatches and adjust your hook size as needed to match the recommended gauge, ensuring that your final project fits and drapes well.
Large Hooks and Thicker Yarns
For projects using thicker yarns like worsted weight, chunky, or even jumbo yarns, you’ll want to use larger crochet hooks. These hooks, sized H-8 (5.00mm) and larger, are suitable for creating cozy blankets, warm scarves, and comfy sweaters. Here’s a quick reference for selecting the right hook for your thicker yarns:
- Worsted weight yarn: H-8 (5.00mm) to J-10 (6.00mm) crochet hooks
- Chunky yarns: K-10.5 (6.50mm) to M-13 (9.00mm) crochet hooks
- Jumbo yarns: N-15 (10.00mm) and larger crochet hooks
Using a larger hook with thicker yarns allows for better stitch definition and creates a more open and airy fabric, perfect for those cozy projects. As always, make sure to check your gauge and adjust your hook size accordingly, ensuring a proper fit and drape for your finished project.
Best Tips for Choosing the Right Crochet Hook
Considering Yarn Weight
When selecting the right crochet hook, always consider the weight of the yarn you’re using. The yarn weight chart is a helpful tool to find the correct crochet hook size for your project. To make it easier, most yarn bands will provide suggestions for the appropriate crochet hook size. It’s a good idea to keep in mind the yarn’s category, as it will also affect the choice of hook.
Checking the Pattern
Don’t forget to pay attention to the pattern you’re working with. The pattern will often recommend a specific hook size to ensure your project turns out just right. If the pattern doesn’t mention the hook size, you can refer to the yarn weight chart and the information provided on the yarn band. Make sure to follow the pattern’s recommendations to achieve the desired result.
Testing with a Gauge Swatch
A gauge swatch is a small sample of your crochet work used to test stitch size and tension. Before starting your project, create a gauge swatch with the recommended crochet hook size and the yarn you plan to use. This will allow you to adjust your hook size if necessary to match the pattern’s gauge. If your swatch is larger than the pattern’s gauge, try using a smaller hook, and if it’s smaller, use a larger hook. This will ensure your finished project will have the correct size and fit. Remember, practice makes perfect, so don’t be discouraged if you need to make a few adjustments along the way.
Effect of Hook Size on Crochet Stitches and Fabric
As you delve into the world of crochet, it’s essential to understand the impact of crochet hook size on your stitches and the resulting fabric. The size of your crochet hook plays a vital role in shaping the appearance and feel of your final project.
When you use a larger hook, you’ll likely notice a looser and more drapey crochet fabric. This is because each crochet stitch is larger in size, creating larger gaps or holes between stitches. This can be great for airy and lightweight projects like shawls or lacy summer tops, but may not work as well for more structural items like bags or tight-fitting garments.
On the other hand, using a smaller crochet hook will result in smaller stitches, making the fabric denser and firmer. In this case, there are fewer gaps or holes between stitches, which means your crochet fabric will be more solid and hold its shape better. This is particularly suitable for projects that require a sturdier fabric, such as amigurumi, cozy blankets, or winter accessories.
The number of stitches in your crochet pattern also affects the overall size of the project. This is known as gauge, which refers to the number of stitches and rows within a specific measurement (typically 4×4 inches or 10×10 cm). It’s crucial to pay attention to gauge when working on projects that require a particular fit or size, as different hook sizes can drastically alter the dimensions.
Here’s a brief summary to help you remember the effects of crochet hook size:
- Larger Hooks: Create larger stitches, resulting in a looser, more drapey crochet fabric with bigger gaps between stitches.
- Smaller Hooks: Produce smaller stitches, resulting in a denser, firmer crochet fabric with smaller holes between stitches.
Remember, the choice of crochet hook size matters when working on your project. Always consider the type of yarn, the project’s intended purpose, and the desired texture when selecting the appropriate hook size. This will ensure that your finished crochet item turns out just as you envisioned it.
Here are some of my favorite hooks:
Standardization and Conversion Charts
As a crochet enthusiast, you probably know the importance of using the correct size crochet hook for your projects. To help with that, there are standardization guidelines provided by the Craft Yarn Council that allow multiple brands and types of crochet hooks to feature a consistent sizing. This makes it easier for you to find the right hook size for your projects.
When selecting a crochet hook, you’ll often encounter both metric and US sizes. To easily switch between these measurements, a conversion chart is the perfect solution. You can find crochet hook size charts that display sizes in millimeters (mm) and their corresponding US letter or number size. This way, no matter which kind of measurement a pattern uses, you’ll have a handy reference to find the equivalent sizes.
To effectively utilize a size chart, first identify the crochet hook size specified in your pattern. Then, use the chart to match the size to its metric or US counterpart. Keep in mind that even if the chart is not 100% accurate, it will still steer you in the right direction and help you find the appropriate crochet hook for your project. Here’s a basic example of what a crochet hook conversion chart may look like:
Here is a complete crochet hook size chart that includes US, UK, and Metric sizes:
Japanese | UK | Metric | US |
---|---|---|---|
2/0 | 14 | 2.00mm | B/1 |
3/0 | 13 | 2.25mm | |
4/0 | 12 | 2.50mm | C/2 |
5/0 | 11 | 3.00mm | |
10 | 3.25mm | D/3 | |
6/0 | 9 | 3.50mm | E/4 |
7/0 | 8 | 4.00mm | G/6 |
7.5/0 | 7 | 4.50mm | 7 |
8/0 | 6 | 5.00mm | H/8 |
5 | 5.50mm | I/9 | |
10/0 | 4 | 6.00mm | J/10 |
3 | 6.50mm | K/10.5 | |
5 | 2 | 7.00mm | |
8 | 0 | 8.00mm | L/11 |
Please note that not all sizes have a direct equivalent in each system, and some sizes may not be available in certain countries. The Metric system is the most standardized and is used as the base for all other measuring systems.
Final Thoughts on Crochet Hook Sizes
Wow! Okay that’s a lot of information to take in! Just remember to check the recommended hook size on your pattern, or look at the recommended hook size on the yarn label for help if you get confused by all the options.
Everyone starts out a little overwhelmed but you will get there! If you’re really unsure, you can always buy a crochet kit and include the recommended hook for the project.
Just click on the image above to check out the kits.
I hope you enjoy this amazing hobby called crochet!
Amanda