Friday, 6 December 2024

Decoding Crochet Hook Sizes: A Comprehensive Guide

Image shows various different crochet hooks, splayed out on a red surface. Text reads: Decoding Crochet Hook Sizes: A Comprehensive Guide

Hello! Have you ever found yourself baffled by the seemingly endless array of crochet hook sizes? It can be confusing to navigate between metric measurements, numbered sizes and letter-number combinations. I mean, how can the SAME hook be known as a 4mm, a G/6, an 8 AND a 7/0? 

Don't worry! My blog post will help you unravel this tangle and select the perfect hook for your next project.

Understanding Crochet Hook Sizes

Crochet hooks come in various sizes, each designed for specific yarn weights and project types. The most common sizing systems are:

  1. Metric System: Measured in millimetres (mm), this is the most widely used system, especially in European countries. I write my patterns with the hook sizes stated in mm, adding the US sizes when I remember!
  2. The US System: This letter and number system is typically used in the United States of America; this system combines letters with numbers to denote hook size, for example H/8.
  3. Numbered System: The old UK and Canadian crochet hook size system uses numbers, similar to the US system, but with slightly different numbering. It's important to note that this system is now less commonly used, and that most modern patterns use the metric or US system.
  4. Japanese System: The Japanese crochet hook size system uses numbers but the numbers definitely do not refer to millimetres! It's essential to refer to a conversion chart to accurately match Japanese hook sizes to the system you're most familiar with.

A Handy Crochet Hook Size Chart 

Would a FREE copy of my crochet hook conversion chart be helpful? Sign up for my mailing list and I'll send it straight to your inbox! This chart will help you to see at a glance the hook sizes across the different systems. When you sign up, you'll also receive exclusive crochet tips, patterns, and updates on new blog posts. Don't miss out, subscribe today! 

Anatomy of the Crochet Hook

Did you know, the part of the crochet hook which dictates its size is the shaft? Also known as the shank, this is the long, cylindrical part of the hook (see infographic below). It's the diameter of the shaft or shank which determines the size of the stitches you can create with that particular hook.


Infographic with an image of a crochet hook in the centre with arrows pointing to each of the different parts. Clockwise from left: head, lip or nose, throat, thumb grip, handle, shaft or shank, neck


Tips for Choosing the Right Hook Size

  • Read your Pattern Carefully: Well written crochet patterns should specify the recommended hook size.
  • Consider the Yarn Weight: Different yarn weights require different hook sizes - as a general rule of thum, the thicker the yarn, the bigger the hook size. The yarn label will give you some guidance here, though frustratingly, they often only give knitting needle size recommendations.
  • Experiment: Don't be afraid to try different hook sizes to achieve your desired fabric. We all crochet slightly differently!
  • Check Your Tension: If your stitches are too loose or too tight, adjust your hook size accordingly. For more advice on tension, please visit my blog post all about.

I hope that I've given you a good understanding of the different sizing systems and that, by following my tips, you'll be confident about selecting the perfect crochet hook for any project. 

Until next time, happy crocheting,

Marta xx


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