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Yarn weight refers to the thickness of the yarn strand.
Different yarn weights create different fabric textures and require different hook sizes: thinner yarns create lighter fabric with smaller hooks, while thicker yarns create heavier fabric with larger hooks.
Crochet patterns usually specify a yarn weight to help achieve the correct size and texture. The chart below shows the standard yarn weight categories along with common names and typical crochet hook sizes.
| Weight # | Yarn Weight Name | Common Names | Typical Hook Size |
|---|---|---|---|
| 0 | Lace | Thread, Cobweb | 1.5–2.25 mm |
| 1 | Super Fine | Fingering, Sock | 2.25–3.25 mm |
| 2 | Fine | Sport | 3.25–3.75 mm |
| ★ 3 | Light | DK, Light Worsted | 3.75–4.5 mm |
| ★ 4 | Medium | Worsted, Aran | 4.5–5.5 mm |
| ★ 5 | Bulky | Chunky | 5.5–8 mm |
| 6 | Super Bulky | Super Chunky | 8–12 mm |
| 7 | Jumbo | Roving | 12 mm + |
★ Indicates the most commonly used yarn weights for crochet projects.
Tip: The recommended hook size listed on a yarn label is only a guideline. The hook size you use may vary depending on your tension and the type of project you are making.
Why Yarn Weight Matters
- Thinner yarns create lighter, more delicate fabric.
- Thicker yarns create warmer, heavier fabric.
- Patterns are designed for specific yarn weights, so using the correct weight helps achieve the intended size and texture.