Yarn weight #2

Fine weight yarn (#2)

Fine yarn is category 2 in the Craft Yarn Council system and is usually labelled sport or baby weight. Crocheters work fine yarn with a 3.5–4.5 mm hook, US E-4 to 7, reaching 16–20 single crochet per 4 inches. Fine yarn suits baby blankets, summer tops and lightweight cardigans.

By the crochetpatterns.io editorial team · Reviewed September 13, 2026 · Editorial policy

Fine yarn at a glance
Detail	Value
CYC number	#2
Also called	Sport, Baby, 4-ply (UK/AU, approximate)
Crochet gauge	16–20 sc per 4 in / 10 cm
Hook size (mm)	3.5–4.5 mm
Hook size (US)	E-4 to 7
Yards per 100 g	about 250–350 yd
Best for	Baby blankets, Summer tops, Lightweight cardigans, Amigurumi

What is fine weight yarn called in the US and UK?

Fine yarn is category 2 in the Craft Yarn Council system. You will also see it sold as sport, baby, 4-ply (uk/au, approximate). It typically runs about 250–350 yd per 100 g, though the exact length depends on the fibre.

How does fine yarn compare with the weights either side?

Super Fine (#1) is one step finer and works up at 21–32 sc per 4 in / 10 cm. Light (#3) is one step thicker at 12–17 sc per 4 in / 10 cm. Moving one weight up usually means going up about one to two hook sizes.

Fine yarn and neighbouring weights
Weight	Crochet gauge (4 in)	Hook (mm)	Hook (US)	Yards per 100 g
#1 Super Fine	21–32 sc per 4 in / 10 cm	2.25–3.5 mm	B-1 to E-4	about 350–500 yd
#2 Fine	16–20 sc per 4 in / 10 cm	3.5–4.5 mm	E-4 to 7	about 250–350 yd
#3 Light	12–17 sc per 4 in / 10 cm	4.5–5.5 mm	7 to I-9	about 200–280 yd

What hook size should you use for fine yarn?

Start with a hook between 3.5–4.5 mm (E-4 to 7). Standard hooks in that range are 3.5 mm (US E-4), 3.75 mm (US F-5), 4 mm (US G-6), 4.5 mm (US 7). Go down a size for tighter fabric such as amigurumi, and up a size for drape.

What is fine yarn best for?

Fine yarn is a good choice for baby blankets, summer tops, lightweight cardigans, amigurumi. Our library has 12 patterns in this weight, such as campus queen woven plaid shawl (1951), fantasy star stitch stole (1960), post stitch ribbed bookmark with tassel, colonial charm hexagon afghan (1952), concerto popcorn and shell stole (1960).