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Yarn Weight Guide: From Lace to Jumbo, With Matching Hook Sizes
Yarn weight means the thickness of the strand, not how heavy the ball is. The standard system numbers yarns from 0 (lace) to 7 (jumbo); worsted, the most common crochet yarn, is #4 and works with a 5–6.5 mm hook.
Updated:
- Eight standard weights: 0 lace, 1 super fine, 2 fine, 3 light, 4 medium, 5 bulky, 6 super bulky, 7 jumbo.
- Worsted (#4) is the most common crochet yarn; DK (#3) is a bit thinner; chunky (#5) is thicker.
- UK and Australian names: 4 ply ≈ fingering, DK = 8 ply, aran ≈ worsted/10 ply, chunky ≈ 12 ply.
- To substitute yarn, match the weight category and the yards (meters) per gram, then check gauge.
- The yarn label shows the weight number, suggested hook size and gauge, so read it before buying.
Yarn weight chart with hook sizes
| # | Category | Common names | Hook range | Typical uses |
|---|---|---|---|---|
| 0 | Lace | lace, thread, 1–2 ply | steel or 1.5–2.25 mm | doilies, fine shawls |
| 1 | Super fine | fingering, sock, 4 ply | 2.25–3.5 mm | socks, light shawls, baby items |
| 2 | Fine | sport, baby, 5 ply | 3.5–4.5 mm | baby clothes, lightweight tops |
| 3 | Light | DK, light worsted, 8 ply | 4.5–5.5 mm | garments, amigurumi, baby blankets |
| 4 | Medium | worsted, aran, afghan, 10 ply | 5.5–6.5 mm | blankets, hats, scarves, beginner projects |
| 5 | Bulky | chunky, craft, rug, 12 ply | 6.5–9 mm | warm hats, quick blankets, rugs |
| 6 | Super bulky | super chunky, roving | 9–15 mm | chunky throws, cowls |
| 7 | Jumbo | jumbo, arm-knitting yarn | 15 mm and up | giant blankets, baskets |
Hook ranges are guidelines. Amigurumi deliberately goes smaller; lacy shawls often go larger.
How to read a yarn label
A yarn label (ball band) tells you nearly everything you need:
- Weight symbol: a skein icon with a number from 0 to 7.
- Length and weight: e.g. 200 yd / 100 g. This ratio is the best way to compare thickness between brands.
- Fiber content: acrylic, wool, cotton, blends.
- Recommended hook or needle size and a gauge square, often for knitting and crochet separately.
- Dye lot: buy all balls for one project from the same dye lot; colors can vary slightly between lots.
- Care symbols: machine washable, hand wash, or dry flat.
Worsted vs DK vs aran: the confusing middle
The middle weights cause the most confusion because names overlap between countries.
- DK (double knitting) is #3, a light yarn. In Australia and New Zealand it is called 8 ply.
- Worsted is a US name for #4. It is slightly thinner than aran but both sit in category 4.
- Aran is the UK name for the heavier end of #4, often called 10 ply in Australia.
A worsted pattern can usually be made in aran, sometimes with a smaller hook. Swapping DK for worsted will make a noticeably smaller item unless you adjust stitch counts.
Choosing fiber for your project
| Fiber | Good for | Notes |
|---|---|---|
| Acrylic | blankets, toys, beginners | soft, washable, affordable, wide color range |
| Cotton | dishcloths, summer tops, amigurumi | strong, absorbent, crisp stitch definition, little stretch |
| Wool | hats, sweaters, winter accessories | warm, elastic, blocks well; check if machine washable |
| Blends | garments, baby items | combine softness, washability and warmth |
For baby items, choose a soft, machine-washable yarn and avoid long fuzzy fibers that can shed.
Identifying unlabeled yarn: wraps per inch
Lost the label? Wrap the yarn snugly but without stretching around a ruler or pencil, side by side with no gaps and no overlap, for one inch (2.5 cm). Count the wraps and compare:
| Wraps per inch (approx.) | Likely weight |
|---|---|
| 30 or more | #0 lace |
| 14–30 | #1 super fine |
| 12–18 | #2 fine |
| 11–15 | #3 light / DK |
| 9–12 | #4 medium / worsted |
| 6–9 | #5 bulky |
| 5–6 | #6 super bulky |
| 4 or fewer | #7 jumbo |
The ranges overlap because fiber and twist change how a yarn wraps, so treat the result as a starting point and confirm with a small swatch.
How to substitute a different yarn
- Match the weight category (#0–#7).
- Compare yards per 100 g (or meters per 100 g). Within about 10% is a close match.
- Consider fiber: cotton has less stretch and more weight than acrylic or wool, which changes drape and fit.
- Calculate quantity by total length, not number of balls: total yards needed ÷ yards per ball, then round up.
- Make a gauge swatch before starting anything that needs to fit.
If you only have a thinner yarn, you can sometimes hold two strands together; two strands of a #3 often behave like a #4 or #5. Swatch to be sure.
Every pattern in Yarny lists its materials, and the yarn color palettes help you pick shades that work together before you buy.
Frequently asked questions
What is the most common yarn weight for crochet?
Medium weight (#4), usually called worsted in the US and aran in the UK. It works up quickly, is easy to see, and suits blankets, hats, scarves and most beginner patterns.
Is DK the same as worsted?
No. DK is a light yarn (#3) and worsted is medium (#4), so worsted is thicker. Using DK in a worsted pattern makes a smaller, denser piece unless you change the hook or stitch counts.
What hook do I use with chunky yarn?
Bulky or chunky yarn (#5) usually works with a 6.5 to 9 mm hook. Check the yarn label, and make a small swatch to see whether the fabric feels too stiff or too loose.
What does ply mean in yarn?
Ply is the number of strands twisted together to make a yarn. In the UK, Australia and New Zealand, ply names such as 4 ply, 8 ply and 12 ply are also used as weight labels, but the number of strands no longer reliably tells you the thickness.
Can I use a different yarn weight than the pattern says?
You can, but the size and feel will change. For items that do not need to fit, like blankets, it is often fine. For garments, either stick to the same weight or recalculate stitch counts from your own gauge swatch.