Yarn guide

Everything yarn, explained

Choose yarn with confidence. Decode labels and weights, compare fibers, find the right hook and work out exactly how much to buy.

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Yarn Weight Chart for Crochet

Understand yarn weights at a glance — from lace to jumbo — with typical crochet gauge, recommended hook sizes and what each weight is best for.

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Charts & reference

Yarn weights, hook sizes and quick lookups.

Crochet Hook Size Chart: Metric, US & UKConvert crochet hook sizes between millimeters, US letters and old UK numbers, and learn how to choose the right hook for your yarn and project.1 min read

Fibers

How cotton, acrylic, wool and friends behave.

Yarn Fibers for Crochet: Cotton, Acrylic, Wool & MoreHow common yarn fibers behave in crochet — cotton, acrylic, wool, merino, bamboo and chenille — and which to choose for amigurumi, blankets, bags and wearables.2 min read

Planning a project

Substitutions, yardage and buying the right amount.

How to Substitute Yarn in a Crochet PatternSwap the yarn in any crochet pattern with confidence: match the weight and gauge, compare fiber and yardage, and work out exactly how many skeins you need.2 min read

Yarn weights at a glance

Standard yarn weights with typical crochet gauge and hook sizes
Weight	Also called	Crochet gauge (4 in / 10 cm)	Hook (mm)	Hook (US)	Approx. WPI
0Lace	Fingering, 10-count crochet thread	32–42 dc*	Steel 1.6–1.4 mm; regular 2.25 mm	Steel 6–8; B-1	30–40+
1Super Fine	Sock, fingering, baby	21–32 sc	2.25–3.5 mm	B-1 to E-4	14–30
2Fine	Sport, baby	16–20 sc	3.5–4.5 mm	E-4 to 7	12–18
3Light	DK, light worsted	12–17 sc	4.5–5.5 mm	7 to I-9	11–15
4Medium	Worsted, afghan, aran	11–14 sc	5.5–6.5 mm	I-9 to K-10½	9–12
5Bulky	Chunky, craft, rug	8–11 sc	6.5–9 mm	K-10½ to M-13	6–9
6Super Bulky	Super bulky, super chunky, roving	7–9 sc	9–15 mm	M-13 to Q	5–6
7Jumbo	Jumbo, roving	6 sc and fewer	15 mm and larger	Q and larger	1–4

Ranges are general guidelines based on the industry-standard yarn weight system. *Lace-weight crochet gauge is usually given in double crochet. Always follow your yarn label and pattern.