Guide to Sizing
WHAT NEEDLE OR HOOK DO I USE?
Knitting needles and crochet hooks can vary in the way they are labelled depending on whether you're using needles that are in metric size, US size or UK size.
The following table can be helpful if you need to convert knitting needle sizes:
HOW ARE YARN WEIGHTS CATEGORISED?
The table below from the US Craft Council outlines some general yarn weight categories and suggests suitable needle and hook sizes in metric and US sizings.
Categories of yarn, gauge ranges, and recommended needle and hook sizes:
* GUIDELINES ONLY: The above reflect the most commonly used gauges and needle or hook sizes for specific yarn categories.
** Lace weight yarns are usually knitted or crocheted on larger needles and hooks to create lacy, openwork patterns. Accordingly, a gauge range is difficult to determine. Always follow the gauge stated in your pattern.
*** Steel crochet hooks are sized differently from regular hooks—the higher the number, the smaller the hook, which is the reverse of regular hook sizing