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All About Sizes for Knitting Needles and Crochet Hooks
If you’ve ever stood in front of a yarn shelf wondering if crochet hook sizes and knitting needle sizes follow some secret ancient code, you’re not alone. Every maker has faced the big question at some point: Do you use the same size crochet hook as knitting needles?
Short answer: sometimes.
Long answer: keep reading because we’re about to make this whole sizing world make sense.
Grab your yarn, your favorite cup of something warm, and let’s untangle this topic.
Why sizes matter more than we think
The size of your hook or needle decides what your stitches look like. Tight, loose, airy, chunky, soft, structured... all of that comes from two things:
- Your tension
- Your tool size
When the size is off, your hat turns into a fruit bowl, your sweater becomes a tent, and your scarf grows into a questionable blanket. So yes, size matters here.
Crochet vs Knitting Tools: Same idea, different jobs
Crochet hooks come in single sticks with a hook at the end. Knitting needles work in pairs (except circulars, which are the overachievers of the knitting world).
Even though yarn labels may list both tools, a 5 mm crochet hook and a 5 mm knitting needle won’t behave the same way. Crochet makes thicker, denser fabric. Knitting tends to be lighter and stretchier.
So when someone asks, “Do you use the same size crochet hook as knitting needles?” The safe answer is: use the size your pattern suggests, not the size your cousin said works “just fine.”
Hoooked Knitting Needle to Crochet Hook Conversion Chart
Here’s the star of the show. If you ever feel confused when switching between crafts, this knitting needle to crochet hook conversion chart will save you time, tears, and frantic Googling.
Note: Please use the Hoooked Crochet Hooks and Knitting Needle Size Conversion Chart as a guide, actual sizes may differ by manufacturer because of shapes and materials of crochet hooks.
Needle & Hook Conversion Chart
| Metric (mm) | Knitting Needle (US) | Knitting Needle (UK) | Crochet Hook (US / Steel) | Crochet Hook (UK / Steel) |
|---|---|---|---|---|
| 1.5 | - | - | 6 steel | 3.5 steel |
| 1.75 | - | - | 5 steel | - |
| 2 | 0 | 14 | 4 steel | 14 or 2.5 steel |
| 2.25 | 1 | 13 | B-1 or 2 steel | 13 or 1.5 steel |
| 2.5 | - | - | - | 12 |
| 2.75 | 2 | 12 | C-2 or 1 steel | 1 steel |
| 3 | 3 | 11 | D-3 or 0 steel | 11 |
| 3.25 | 3 | 10 | - | 10 or 0 steel |
| 3.5 | 4 | 9 | E-4 or 00 steel | 9 |
| 3.75 | 5 | 9 | F-5 | 8 |
| 4 | 6 | 8 | G-6 | 8 |
| 4.25 | - | - | - | 7 |
| 4.5 | 7 | 7 | 7 | - |
| 5 | 8 | 6 | H-8 | 6 |
| 5.5 | 9 | 5 | I-9 | 5 |
| 6 | 10 | 4 | J-10 | 4 |
| 6.5 | 10.5 | 3 | K-10.5 | 3 |
| 7 | - | 2 | - | 2 |
| 7.5 | - | 1 | - | - |
| 8 | 11 | 0 | L-11 | - |
| 9 | 13 | 00 | M/N-13 | - |
| 10 | 15 | 000 | N/P-15 | - |
| 12.75 | 17 | - | - | - |
| 15 | 19 | - | P/Q | - |
| 16 | - | - | Q | - |
| 19 | 35 | - | S | - |
| 25 | 50 | - | - | - |
Picking the right material: Metal, Bamboo, or something fancy?
Because you’re shopping with us, you already know we love yarn that treats the planet kindly. The same goes for tools.
Metal Crochet Hooks
Smooth, fast, great for tight crocheters.
If your yarn keeps snagging or you're someone who crochets at turbo-speed, metal hooks glide like butter.
They're durable, great for small projects, and perfect for cotton yarns.
Bamboo Crochet Hooks
Light, warm, gentle on the hands, and sustainable. If you like a softer grip and a natural feel, bamboo hooks are your best friend.
They create more control for beginners because the yarn doesn’t slip away as easily. Advanced makers also love them, especially for larger projects.
Which one should I pick?
If you're unsure, go bamboo to start.
If you already crochet like you mean business, try metal.
If you want both? Treat yourself. We won’t judge.
How to use this chart without overthinking it
Here’s the easiest way to choose your tool:
- Start with the metric size listed on your yarn label.
- Match that number to the hook or needle size in the chart.
- Make a small swatch.
- Adjust if your stitches look too loose or too tight.
That’s it. No spreadsheets needed.
Final thoughts before you run to your yarn stash
Whether you knit, crochet, or happily do both, the right tool makes a big difference. This guide gives you the basics, the conversions, and a better feel for how sizes work. You're now officially prepared to decode any yarn label you meet.
And remember: Your tools should feel good in your hands, match your project, and make crafting fun. Because at the end of the day, it’s all about joy, creativity, and maybe a little yarn obsession. We support all of that.
Want to start your next project?
Take a look at our sustainable crochet hooks and beautiful yarns. Your next masterpiece is already waiting for you.
