The standard 0–7 yarn weight system, with recommended hook sizes and gauge for each.
| # | Category | Also called | Hook size | Sts / 10cm (approx.) |
|---|
Yarn weight refers to the thickness of the strand, not how heavy the skein is. The standard numbered system (0 for the finest lace-weight thread, up to 7 for jumbo roving-style yarn) makes it easy to compare yarns across brands, since names like "worsted" or "sport" can vary slightly between manufacturers. The number is usually printed right on the yarn label alongside a recommended hook size.
What is the most common yarn weight for crochet?
Worsted weight (category 4, "Medium") is the most widely used yarn weight for crochet — it works for blankets, amigurumi, and garments, and is the weight most beginner patterns are written for.
What yarn weight is best for amigurumi?
Most amigurumi patterns use category 3 (Light/DK) or category 4 (Medium/Worsted) yarn with a hook one or two sizes smaller than recommended, to create a tight fabric that hides stuffing.
Can I substitute a different yarn weight in a pattern?
You can, but it will change the finished size and yardage needed, and you'll need to re-check your gauge. Use the Gauge Calculator and Yarn Calculator after swatching with the substitute yarn.