Craft Yarn Council Standard Charts
The Craft Yarn Council website posts excellent charts for standard crochet hook sizes, yarn weights, clothing sizes, and much more. Crochet Today magazine uses these same standards for all our patterns.
If you need to substitute a different yarn, try to choose one that is in the same weight or size, as shown in the chart below. For example, substitute a size 4 yarn with a another size 4 yarn. This chart also includes the suggested hook size and gauge for each yarn size.
Many patterns published in Europe or the UK use only mm sizes for hooks, while US patterns rely on letter sizes. How can you tell which size to use? Refer to the handy chart below.
If you need help figuring out a pattern's abbreviations and terms, check the list below:
When choosing the right size for a sweater or other garment, you can't always rely on your ready-to-wear size. It is much more accurate to take your own measurements--use the diagrams and instructions below to see exactly where to measure yourself or another person:
And there are more handy references on our sister website, the Making Spot.