Read the convention
CYC rows are standards guidance. UK, AU/NZ, and Japanese names are published conventions that can overlap.
CYC 0–7 · data reviewed 15 Aug 2026
Find the yarn weight. See the evidence.
Translate a name, identify a yarn, or calculate a substitute—including yarns held together. Everything runs on this page.
Method: official CYC ranges + published regional conventions + your exact ball-band numbers. A blocked swatch still decides the fabric.
Yarn weight tool
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What term are you looking at?
Search US, UK, AU/NZ, CYC, or Japanese terms. “4 ply” asks what the 4 means before resolving.
Context required
What does the “4” describe?
Combine what you can measure
Start with the ball band
Quantity first, compatibility second
What does the pattern require?
Improve this comparison Add the original label, categories, or blocked gauges
The thickness continuum
CYC 0–7 Gauge Plate
Select a category in Match. In Identify and Substitute, the plate shows the evidence.
- Lace
- Super Fine
- Fine
- Light
- Medium
- Bulky
- Super Bulky
- Jumbo
Result
Start with the term you see
—
Search a name such as DK, 4 ply, or 並太. The result will show the source posture and closest categories before you buy yarn.
How the answer is built
Three evidence levels, kept separate
Use the label numbers
Length per 100 g is reproducible comparison evidence, but fibre density, loft, twist, and construction still affect fabric.
Confirm the fabric
Gauge, drape, and hand come from a blocked swatch in the pattern stitch. No category table can replace it.
Printable reference
Yarn weight comparison chart
Official CYC 0–7 guidance plus clearly marked regional comparisons. A dagger † means credible references disagree.
| CYC | US / common | UK | AU / NZ | Japanese comparison | Knit gauge | Needles | Crochet gauge | Hooks | m / 100 g | WPI |
|---|---|---|---|---|---|---|---|---|---|---|
| 0 · Lace | Lace, cobweb, light fingering† | 1 ply, 2 ply, 3 ply† | 2 ply, 3 ply† | 極細 gokuboso · 合細 aiboso† | 33–40 sts / 4 in | 1.5–2.25 mm · US 000–1 | 32–42 dc / 4 in | 1.4–2.25 mm · US steel 6–8 / B-1 | 600–1100 m/100 g | 30–40+ |
| 1 · Super Fine | Fingering, sock, baby† | 4 ply† | 4 ply† | 合細 aiboso · 中細 chūboso† | 27–32 sts / 4 in | 2.25–3.25 mm · US 1–3 | 21–32 sc / 4 in | 2.25–3.5 mm · US B-1–E-4 | 420–580 m/100 g | 14–30 |
| 2 · Fine | Sport, baby† | 5 ply, sport | 5 ply | 中細 chūboso · 合太 aibuto† | 23–26 sts / 4 in | 3.25–3.75 mm · US 3–5 | 16–20 sc / 4 in | 3.5–4.5 mm · US E-4–7 | 260–400 m/100 g | 12–18 |
| 3 · Light | DK, light worsted† | double knitting, DK | 8 ply | 合太 aibuto · 並太 namibuto† | 21–24 sts / 4 in | 3.75–4.5 mm · US 5–7 | 12–17 sc / 4 in | 4.5–5.5 mm · US 7–I-9 | 210–250 m/100 g | 11–15 |
| 4 · Medium | Worsted, Afghan, Aran† | Aran† | 10 ply | 並太 namibuto† | 16–20 sts / 4 in | 4.5–5.5 mm · US 7–9 | 11–14 sc / 4 in | 5.5–6.5 mm · US I-9–K-10½ | 130–200 m/100 g | 9–12 |
| 5 · Bulky | Bulky, chunky, craft, rug | Chunky | 12 ply, 14 ply† | 極太 gokubuto† | 12–15 sts / 4 in | 5.5–8 mm · US 9–11 | 8–11 sc / 4 in | 6.5–9 mm · US K-10½–M-13 | 90–120 m/100 g | 6–9 |
| 6 · Super Bulky | Super bulky, roving† | Super chunky | 14 ply, 16 ply† | 超極太 chōgokubuto† | 7–11 sts / 4 in | 8–12.75 mm · US 11–17 | 7–9 sc / 4 in | 9–15 mm · US M-13–Q | 40–80 m/100 g | 5–6 |
| 7 · Jumbo | Jumbo, roving† | Jumbo | Jumbo | ジャンボ · ロービング† | 6 or fewer sts / 4 in | 12.75 mm or larger · US 17 or larger | 6 or fewer sc / 4 in | 15 mm or larger · US Q or larger | below 40 m/100 g | 1–4 |
- CYC guidance: follow the pattern’s gauge and make a blocked swatch. Same category does not guarantee the same hand or drape.
- Grist: metres per 100 g are DMC/Cowgirlblues published orientation bands, not CYC standard fields and not physical diameter.
- WPI: current CYC bands overlap substantially and depend on wrapping tension.
- Regional/Japanese names: comparisons retain disagreement instead of merging sources into one false equivalence.
Source posture
What this chart can—and cannot—tell you
The controlling CYC rows and WPI table were reviewed on 15 August 2026. Regional terms and length-per-mass bands come from named published references. Thresholds used to rank evidence are practical comparison rules, not standards.
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