What Letter Is A 4.5 MM Crochet Hook? – Easy guide to crochet hook sizes

Wondering what letter is a 4.5 mm crochet hook? The 4.5mm crochet hook is actually the number ‘7’ rather than a letter like the majority of crochet hook sizes. This size hook is often used for crocheting projects that use medium-weight yarns and threads. The smaller the number associated with the crochet hook, the smaller the hook will be.

understanding crochet hook sizes

The size of crochet hooks can vary depending on the manufacturer. However, most 4.5 mm crochet hooks would be considered a ‘7’ or a size G or H hook.

Crochet Hook Size Conversion Chart

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

Size H Crochet Hook in Mm

If you’re a crochet beginner, you may be wondering what size hook to use. The most important factor is the type of yarn you’re using. Different yarns require different-sized hooks.

For example, DK weight yarn is usually crocheted with a size H (5 mm) hook, while worsted weight yarn is usually crocheted with a size I (5.5 mm) hook. Now that you know the general rule, let’s talk about the specifics of the Size H Crochet Hook in mm. This particular hook is on the smaller side, which means it’s great for delicate projects made with thinner yarns.

It’s also a good choice for amigurumi projects – those cute little stuffed animals made with crochet! Keep in mind that every crocheter is different and that you may prefer a slightly different-sized hook than what is recommended for your chosen yarn. That’s perfectly okay!

The best way to figure out what works best for you is to experiment until you find the perfect combination.

What Letter Is A 4.5 Mm Crochet Hook?

Credit: hearthookhome.com

What Size is a 4.5 MM Hook?

A 4.5 mm (US 7) crochet hook is on the smaller side of the average. It is often used for delicate projects such as lace or doilies, or for crocheting with very thin yarn or thread. It’s a great choice if you are wanting minimal holes in your final product.

What is a 5.5 Crochet Hook?

A 5.5 crochet hook is a size ‘I’ hook and is one of the most common sizes used for crocheting. It is best suited for medium to heavyweight yarns, such as worsted-weight yarn. This size hook can also be used with lighter-weight yarns, but the projects will generally be smaller in size.

What Size Crochet Hook is G?

There is no definitive answer to this question as the size of a crochet hook is dependent on the type and brand of hook you are using. However, most G hooks will fall within the range of 4.0-4.5mm.

What Size is H Crochet Hook?

An H crochet hook is a size 6 metric hook. It is also known as a 5.0 mm or a US H-8 hook.


If you’re a crocheter, you know that there are different sizes of crochet hooks. But what do the numbers and letters mean? In this blog post, we looked at the 4.5 mm crochet hook and what letter it is. We also discussed some of the other most common sizes and their uses.

The 4.5 mm crochet hook is actually the number ‘7’ rather than a letter. This size is perfect for medium-weight yarns and worsted-weight yarns. It’s also a good size to use if you’re just starting out with crochet.

The 4.5 mm hook will give you nice, even stitches that aren’t too loose or too tight.


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!