Yarn Weight Conversion Reference
Yarn weights are categorised by the Craft Yarn Council (CYC) on a scale from 0 (lace) to 7 (jumbo). Older patterns and patterns from outside North America use different naming conventions, which can make substitution confusing.
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CYC 0 (Lace)
Cobweb to lace weight. Typically 33–40 stitches per 4 inches on US 0–3 needles. Used for lace shawls and very fine accessories.
CYC 1 (Fingering / Sock)
Sock weight. Typically 27–32 stitches per 4 inches on US 1–3 needles. Used for socks, fingerless mitts, and lightweight shawls.
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CYC 2 (Sport)
Sport weight. Typically 23–26 stitches per 4 inches on US 3–5 needles. Used for lightweight sweaters and baby items.
CYC 3 (DK / Light Worsted)
DK or "Double Knit" in the UK. Typically 21–24 stitches per 4 inches on US 5–7 needles. The most popular weight for sweaters worldwide.
CYC 4 (Worsted / Aran)
The American "Worsted" and the British "Aran" overlap at this weight. Typically 16–20 stitches per 4 inches on US 7–9 needles. The classic weight for hats, mittens, and warm sweaters.
CYC 5 (Bulky / Chunky)
Bulky weight. Typically 12–15 stitches per 4 inches on US 9–11 needles. Used for fast cosy projects.
CYC 6 (Super Bulky)
Super bulky. Typically 7–11 stitches per 4 inches on US 11–17 needles. For arm-knit blankets and statement scarves.
Abbreviation reference
| Abbreviation | Meaning |
|---|---|
| CYC | Craft Yarn Council |
| DK | double knit |
Tips
- Always verify gauge by swatching, even with a yarn labelled the same weight as the pattern.
- CYC numbers are a starting point — yarn within a single category can vary widely.
- When substituting yarn, match the gauge first and the weight category second.
In depth
The CYC numbering system was introduced in 2003 to standardise yarn weight terminology across the industry. Before then, "worsted" in one country might have meant "aran" in another. The CYC numbers are now printed on most ball bands and are the most reliable single indicator of yarn weight.