Hook size

5 mm crochet hook

A 5 mm crochet hook equals US size H-8 and has old UK size 6. It is the recommended hook range for light (3) yarn, and crocheters typically choose it for DK blankets, cardigans and worsted-weight amigurumi. Always check gauge with a swatch, because tension varies between crocheters.

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

5 mm crochet hook conversions
Metric	US	Old UK	Suits yarn weights
5 mm	H-8	6	#3 Light

What is a 5 mm crochet hook in US and UK sizes?

A 5 mm hook is US size H-8 and old UK size 6. Metric millimetres are the only measurement that is the same on every brand, so check the mm size stamped on the hook.

Hook sizes around 5 mm
Metric	US	Old UK	Yarn weights
4 mm	G-6	8	#2
4.5 mm	7	7	#2, #3
5 mm (this hook)	H-8	6	#3
5.5 mm	I-9	5	#3, #4
6 mm	J-10	4	#4

What yarn weight goes with a 5 mm hook?

A 5 mm hook is typically used with light (#3) yarn. Light yarn gives about 12–17 sc per 4 in / 10 cm and suits garments, baby items, amigurumi.

Yarn weights for a 5 mm hook
Weight	Also called	Crochet gauge	Recommended hooks
#3 Light	DK, Double knitting, Light worsted, 8-ply (AU/NZ)	12–17 sc per 4 in / 10 cm	4.5–5.5 mm

What can you make with a 5 mm hook?

34 patterns in our library use a 5 mm hook, including classic granny square, day and night shell stitch rug (vintage american thread), simple half double crochet baby beanie in the round, easy moss stitch crochet dishcloth, autumn chevron afghan (1952), solid corner-to-corner crochet blanket.