Crochet Yarn Weight Chart

The standard yarn weights from 0 (lace) to 7 (jumbo) with their other names, typical single-crochet gauge and the hook sizes to use, plus a skein substitution helper.

Quick rule

Same weight number + same total yardage = a safe swap. Always check gauge with a swatch, because fibre content (cotton vs acrylic vs wool) changes drape and stretch.

Yarn weights and hook sizes

Weight	Also called	Sc per 4 in	Hook (mm)	Hook (US)	Free patterns
0 – Lace	Fingering 10-count crochet thread	32–42 dc	1.6–1.4 mm steel / 2.25 mm	Steel 6, 7, 8 · B-1	patterns
1 – Super Fine	Sock, Fingering, Baby	21–32	2.25–3.5 mm	B-1 to E-4	patterns
2 – Fine	Sport, Baby	16–20	3.5–4.5 mm	E-4 to 7	patterns
3 – Light	DK, Light Worsted	12–17	4.5–5.5 mm	7 to I-9	patterns
4 – Medium	Worsted, Afghan, Aran	11–14	5.5–6.5 mm	I-9 to K-10.5	patterns
5 – Bulky	Chunky, Craft, Rug	8–11	6.5–9 mm	K-10.5 to M-13	patterns
6 – Super Bulky	Super Chunky, Roving	7–9	9–15 mm	M-13 to Q	patterns
7 – Jumbo	Jumbo, Roving	6 and fewer	15 mm and larger	Q and larger	–

Ranges follow the Craft Yarn Council’s published guidelines and are a starting point; the yarn label and your swatch decide.

Questions

Is DK the same as worsted?

No. DK is a light (3) weight; worsted is medium (4). DK is thinner, so you need more yardage and a smaller hook.

Is aran the same as worsted?

Both are grouped as medium (4), but aran is slightly thicker. They can often be swapped if you check gauge.

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