What Letter Is A 3mm Crochet Hook? – Easy Guide to Crochet Hook Sizes

If you’re new to crocheting, you might be wondering what letter is a 3mm crochet hook and when to use it. The most common crochet hook sizes are 2.5mm, 3mm, and 3.5mm, but there are other sizes available too. So, what letter is a 3mm crochet hook?

In the United States, crochet hooks are typically labeled with a letter or number. The smaller the hook, the higher the letter designation goes. For example, a size B hook is smaller than a size C hook.

Therefore, a 3mm crochet hook would be labeled as a “D” hook in the US (or a 4 mm hook would be a G).

understanding crochet hook sizes

3mm Crochet Hooks are categorized by a letter in the alphabet. It is a common size used in many crochet patterns. This hook can be used to create different types of stitches, such as chain stitch, slip stitch, and single crochet.

When crocheting with this hook, it is important to keep your tension loose so that your work does not become too tight.

H Crochet Hook in MM

Whether you’re a beginner or an experienced crocheter, understanding crochet hook sizes is important. The size of your crochet hook will determine the gauge of your stitches, as well as the overall look and feel of your finished project. In general, the thicker the yarn you’re using, the bigger the hook you’ll need.

For example, if you’re working with bulky yarn, you might use a size N (10 mm) crochet hook. On the other hand, if you’re using thread or lace-weight yarn, you might use a B (2.25 mm) or even C (2.75 mm) crochet hook. It can be helpful to think of it this way: The higher the letter on the crochet hook, the bigger the hook! Or for the UK, the smaller the number the bigger the hook.

What Letter Is A 3Mm Crochet Hook?

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Crochet Hook Size Comparison Chart

Here are some common Crochet Hook Sizes and their metric equivalents, as you can see from this list, there is quite a range of sizes when it comes to crochet hooks!

And that’s not even all of them – there are even larger sizes available for special projects like rugs and afghans.

2.0 mm14Fingering/Super Fine
2.25 mmB-113Fingering/Super Fine
2.5 mm12Fingering/Super Fine
2.75 mmC-2Fingering/Super Fine
3.0 mm11Fingering/Super Fine
3.25 mmD-310Fingering/Super Fine
3.5 mmE-49Fingering/Super Fine
3.75 mmF-5Sport/Fine
4.0 mmG-68Sport/Fine
4.5 mm77DK/Light
5.0 mmH-86DK/Light
5.5 mmI-95Worsted/Medium
6.0 mmJ-104Worsted/Medium
6.5 mmK-10.53Worsted/Medium
7.0 mm2Worsted/Medium
7.5 mm1Bulky
8.0 mmL-110Bulky
9.0 mmM-1300Bulky
10.0 mmN-15000Super Bulky
12 mmO-16Super Bulky
15.0 mmP/Q-19Super Bulky
15.75 / 16.0 mmQJumbo
17.5 mmRJumbo
19.0 mmS-35Jumbo
25.0 mmUJumbo

What Size Crochet Hook Is 3mm?

There is no definitive answer to this question as it depends on the brand of crochet hook you are using. However, most crochet hooks will have a size somewhere between 2.5mm and 3.5mm for a 3mm hook. Therefore, it is important to check the size of your crochet hook before beginning a project.

What Letter Is A 3mm Hook?

There is no definitive answer to this question as the sizing of crochet hooks can vary depending on the manufacturer. However, most 3 mm hooks are typically labeled with a ‘C’ or ‘D’ – meaning that they are medium-sized hooks.

What Is A Size E Crochet Hook In MM?

There is no definitive answer to this question as different brands of crochet hooks can vary slightly in size. However, on average, a size E crochet hook is approximately 3.5 mm in diameter. This can make it a versatile hook to use for a variety of projects as it can accommodate medium-weight yarns and threads.

What MM Is M Crochet Hook?

There is no definitive answer to this question as the size of a crochet hook can vary depending on the brand and type of hook you are using. However, most M crochet hooks are 9mm. So if you are looking for an M crochet hook, you should look for one that is in this range.


A 3mm crochet hook ranges between a C and D but will be more commonly labeled a D. A 3mm hook is best used with a Fingering/Super Fine Yarn.


I’m Jane and I’m the editor of janesknittingkits.com! I am a long-time craft and clothing design fan who has been writing about these interests for years.

I have spent many hours studying knitting, weaving, sewing, embroidery, and quilting as well as learning about various brands and models of sewing gear and machines. In addition to this research, my work involves publishing information related to these topics in ways that will be informative for both amateur crafters like me and more experienced sewers!