Hook size
6.5 mm crochet hook
A 6.5 mm crochet hook equals US size K-10½ and has old UK size 3. It is the recommended hook range for medium (4) and bulky (5) yarn, and crocheters typically choose it for aran and light bulky hats, cowls and textured blankets. Always check gauge with a swatch, because tension varies between crocheters.
By the crochetpatterns.io editorial team · Reviewed · Editorial policy
| Metric | US | Old UK | Suits yarn weights |
|---|---|---|---|
| 6.5 mm | K-10½ | 3 | #4 Medium, #5 Bulky |
What is a 6.5 mm crochet hook in US and UK sizes?
A 6.5 mm hook is US size K-10½ and old UK size 3. Metric millimetres are the only measurement that is the same on every brand, so check the mm size stamped on the hook.
| Metric | US | Old UK | Yarn weights |
|---|---|---|---|
| 5.5 mm | I-9 | 5 | #3, #4 |
| 6 mm | J-10 | 4 | #4 |
| 6.5 mm (this hook) | K-10½ | 3 | #4, #5 |
| 7 mm | — | 2 | #5 |
| 8 mm | L-11 | 0 | #5 |
What yarn weight goes with a 6.5 mm hook?
A 6.5 mm hook is typically used with medium (#4) yarn or bulky (#5) yarn. Medium yarn gives about 11–14 sc per 4 in / 10 cm and suits blankets and afghans, beanies, granny squares. Bulky yarn gives about 8–11 sc per 4 in / 10 cm and suits chunky hats, scarves and cowls, quick throws.
| Weight | Also called | Crochet gauge | Recommended hooks |
|---|---|---|---|
| #4 Medium | Worsted, Afghan, Aran, 10-ply (AU/NZ) | 11–14 sc per 4 in / 10 cm | 5.5–6.5 mm |
| #5 Bulky | Chunky, Craft, Rug, 12-ply (AU/NZ) | 8–11 sc per 4 in / 10 cm | 6.5–9 mm |
What can you make with a 6.5 mm hook?
1 pattern in our library use a 6.5 mm hook, including skiers beware! girl's crocheted hooded jacket.
