Crochet hooks come in many sizes and types. They are always referenced in either the US or Metric sizes. Below I’ve created a handy crochet comparison chart that lists crochet hooks in both US and metric sizes and how to convert one from the other. Scroll down to take a look at the crochet hook chart!
Crochet Patterns by Hook Size
All of our free crochet patterns are tagged with the hook size they use. If you are looking for a crochet pattern to use with a specific hook size, check out our archives below.
What is a Crochet Hook?
First, if you are new to crocheting, a crochet hook is a handheld tool that helps create stitches with yarn. Crochet hooks come in many different sizes and varieties.
Types of Crochet Hooks
Crochet hooks are made in a variety of different material. The hook that works best for you is a personal preference and will vary from crocheter to crocheter. Let’s learn about the different types of crochet hooks that are available below.
- Steel: Steel crochet hooks are great for crocheting with thread (to make doilies for example) since they are the smallest hook sizes available. (see the chart below)
- Plastic: These types of hooks are usually the cheapest to buy but may not last as long as other varieties.
- Aluminum: The most widely available hook and a great beginner hook to use when learning how to crochet. Brands include Susan Bates and Boye.
- Wood: Crochet hooks made of wood that can sometimes be colored and or hand carved.
- Tunisian: Also known as an Afghan hook these long crochet hooks (sometimes with cables) are used by keeping the yarn on the hook the entire time while crocheting. Learn more about Tunisian Crochet.
- Bamboo: Crochet hooks made of Bamboo and usually inexpensive.
- Ergonomic: Made to reduce strain on a hand when crocheting with a larger handle. Brands include Clover, Furls and Tulip.
US and Metric Crochet Hook Sizes
The diameter of a hook shaft determines the size of the hook and the size of the stitches that are made. Hook sizes are measured in millimeters and are available from as small as 2 mm to 20 mm or bigger!
The usual rule of thumb is the bigger or thicker the yarn the bigger size hook you will need. Hooks can be labeled with US sizes or metric sizes so this chart is a great reference for comparison.
Clover is my favorite set of all the common hook sizes. You can buy it on Amazon pretty cheaply:
Since they are many manufacturers of hooks, please take the time to check the size of the hook and your gauge when crocheting a pattern. The difference in sizes in hooks and manufacturers is one of the good reasons to have our chart in arms reach!
All Crochet Hook Sizes
Here we show you all the US sizes of hooks, and their Metric and UK equivalents.
|US Size||Metric Size||UK Size|
|C/2||2.5 mm , 2.75 mm||12|
|D/3||3 mm, 3.25 mm||11, 10|
|F/5||3.75 mm, 4 mm|
|G/6||4 mm, 4.25 mm||8|
|K/10.5||6.5 mm, 7 mm||3, 2|
Steel Crochet Hook Sizes
Usually used for crochet threads and lightweight yarns. These metal hooks numbers size decreases when the diameter increases.
|Metric Size||U.S. Size|
Get a Copy of our Crochet Hook Size Chart
Enter your email address below to download our “Crochet Hook Sizes Chart” reference chart. This chart will come in handy when you are trying to convert US hook sizes to Metric (or vice versa).