Crochet Hook Sizes Explained (And Which One You Actually Need)
- 5 hours ago
- 3 min read
One of the first things you need when you start learning crochet is, of course, a crochet hook and yarn.
Today, let’s break down the hooks.
There are many different hook sizes, and you probably have no idea which one is the right one. They can also be marked in millimetres (mm) or in US terms using letters and numbers — which makes it even more confusing.
So let’s talk about the basics.
Hook Sizes
Let’s have a closer look at sizes.
You’ll notice different numbers on crochet hooks, like 4 mm, 5 mm, 6 mm, etc. This number simply tells you how thick the hook is.
When you use a bigger hook, you get looser stitches. With a smaller hook, your stitches will be tighter.
Hooks can also be labeled in US terms using letters and numbers (for example, a 5 mm hook is called H/8 in US terms), but you don’t need to memorize that right now.
This is the same yarn — only the hook size changes.
What Size Should a Beginner Use?
I would highly recommend starting with a 5 mm hook, because it’s one of the most common sizes used in many projects.
It’s not too small and not too big. It gives you actually a nice balance.
If you choose a 5 mm hook, you’ll usually pair it with medium (worsted, 4) yarn, which is the most common yarn weight.
This combination alone can take you through your first projects.
Hook & Yarn Connection Matters
Every yarn tells you what hook size is recommended.
Look at the label, you’ll see a small hook icon with a size. That’s your starting point.
So even if you choose a different yarn because you love the colour or the brand, always double-check the label.
Do you always need to follow the recommendation? No, absolutely not.
But if you want to experiment (for example, using a bigger hook with thinner yarn), make sure to practice first.
My advice: Pick one hook size and start simple. Add more later only when you actually need them.
Materials of Crochet Hooks
Now let’s have a look at the materials.
Again, there are quite a few options, but let’s keep it simple. The most common ones are:
Aluminum hooks – smooth, simple, and great to start with. They’re also inexpensive.
Ergonomic hooks – perfect for longer sessions and more comfortable to hold. These can be a great upgrade after using aluminum hooks.
Want Everything in One Place?
If you don’t want to keep second-guessing things like hook sizes, yarn choices, and where to actually start, I created a Crochet Starter Kit for Beginners as a clear starting point.
Inside, you’ll find everything in one place:
the theory explained in a simple way (something you can always come back to, no need to memorize it all)
a deeper look into crochet hooks (materials, types like tapered vs inline, and how they actually affect your stitching)
yarn explained so you understand what you’re working with
the basic stitches with step-by-step guidance
how to read crochet patterns
two beginner-friendly patterns to practice
You’ll also get a printable cheat sheet (2 pages) that sums up the most important things like basic abbreviations and symbols, hook sizes in UK and US terms, yarn weights, and recommended hook sizes.
It’s all designed to help you start with clarity, not confusion. Feel free to check it out here:
