Crochet Hook Conversion Chart – Knitting Help

Welcome, fellow yarn enthusiasts! If you’re passionate about the intricate, soothing art of crochet, like myself, you know the magic lies in those special tools of the trade – crochet hooks.

But aren’t we all too familiar with the daunting task of converting hook sizes between the different measurement systems used around the world? Fear not! Today, we’re going to simplify this daunting task with our comprehensive Crochet Hook Conversion Chart.

Crochet hooks come based on different sizing systems: metric, British, Canadian, American alphabetical, American numerical, etc. This chart will give you some idea of which hook size to try if yours is not labelled in metric, as used on this site. Do a swatch to be certain.

Before we dive into the article, we also have an Afghan (blanket) sizes chart so you can choose the right one for your bed.

This chart is the ultimate tool for all of you seasoned crocheters, as well as those who are just starting to dip their toes into the beautiful sea of loops and stitches. Whether you have a crochet pattern from across the pond or a stunning hook set inherited from your grandmother, this chart will be your guiding light.

It will help you navigate through the labyrinth of hook sizes, ensuring your projects turn out perfect, no matter which system your pattern or hooks use.

Metric Canada/UK USA USA
2 14 0
2.25 13 B 1
2.5 12
2.75 C 2
3 11
3.5 9 E 4
3.75 F 5
4 8 G 6
4.5 7 7
5 6 H 8
5.5 5 I 9
6 4 J 10
6.5 3 K 10.5
7 2
8 0 L 11
9 00 M 13
10 000 N 15

Join me as we unravel this knot of confusion together. No longer will we be lost in translation – let’s demystify the world of hook sizes and make our crochet journey smoother. From millimeters to UK and US sizes, let’s crochet our way through with clarity and confidence. With our Crochet Hook Conversion Chart, your patterns and projects are set for success!

Here’s a quick guide on youtube for crocheting which you might find useful:

Welcome to the realm of easy understanding, happy hooking, and most importantly, blissful crocheting.

How to Crochet


Why are there different crochet hook size systems?

Different regions around the world developed their own crochet hook sizing systems over time, leading to the variety we see today. This diversity reflects the rich history and global nature of crochet.

What if my crochet hook doesn’t have a size label?

If your crochet hook doesn’t have a size label, you can use a hook gauge to determine its size. These tools have holes of various sizes that you can insert your hook into to find its match.

What is a swatch test in crochet?

A swatch test involves crocheting a small square with the hook and yarn you plan to use for your project. This helps you determine if you’re achieving the correct gauge as per the pattern.

What is gauge in crochet?

Guage refers to the number of stitches and rows in a specified measurement (usually 1 inch or 4 inches). It’s crucial for ensuring your finished project matches the size specified in the pattern.

What should I do if my gauge doesn’t match the pattern’s gauge?

If your gauge doesn’t match the pattern’s gauge, try adjusting your hook size. If your stitches are too large, try a smaller hook. If they’re too small, try a larger hook.

Is there a standard crochet hook size for beginners?

There’s no standard size, but many beginners find it easier to start with a medium-sized hook, such as an H/8 (5mm) hook.

What material is best for crochet hooks?

The best material depends on your personal preference. Aluminum hooks are durable and slide easily through yarn, while bamboo hooks are lightweight and warm in the hand.


Crocheting is a journey of creativity and patience, a dance between the hook and yarn. While the diversity of hook sizes and systems may seem daunting, remember that every knot, every stitch, is a step towards mastering this beautiful craft.

With our guide, you’re well-equipped to navigate the sea of loops and stitches. So, here’s to happy hooking and blissful crocheting!