Yarn weights explained
From lace to jumbo: what yarn weight means, how it links to hook size, and which weight suits which project.
Yarn weight describes how thick a yarn is. It is the first thing to check when you buy yarn for a pattern, because it decides how the fabric looks, drapes and feels.
The standard weight system
The table shows the Craft Yarn Council’s standard categories and the hook sizes suggested on many yarn labels. Treat these as starting points: brands, fibres and personal tension all vary.
| Weight | Number | Suggested hook (mm) | Good for |
|---|---|---|---|
| Lace | 0 | 1.6–2.25 | Doilies, fine shawls |
| Fingering / Super fine | 1 | 2.25–3.5 | Socks, shawls, lightweight garments |
| Sport / Fine | 2 | 3.5–4.5 | Baby items, lightweight garments |
| DK / Light | 3 | 4.5–5.5 | Garments, baby blankets, amigurumi |
| Worsted / Medium | 4 | 5.5–6.5 | Blankets, hats, bags, garments |
| Bulky | 5 | 6.5–9 | Quick blankets, winter accessories |
| Super bulky | 6 | 9–15 | Chunky blankets, baskets |
| Jumbo | 7 | 15 and up | Arm-knit style blankets, rugs |
Hook size versus label
A pattern may call for a smaller hook than the label suggests. Amigurumi and bags usually use a hook one to two sizes smaller, to make a dense fabric that hides stuffing and holds shape. Drapey items such as shawls sometimes use a larger hook.
Substituting yarn
- Match the weight category, then compare the yardage per 100 g or per ball.
- Match the fibre’s behaviour. A pattern designed for cotton may sag in wool, and one designed for wool may feel stiff in cotton.
- Always make a swatch and check the gauge.