Hook size
12 mm crochet hook
A 12 mm crochet hook has no standard US letter size and has no old UK number. It is the recommended hook range for super bulky (6) yarn, and crocheters typically choose it for super bulky blankets, doubled-yarn rugs and chunky baskets. Always check gauge with a swatch, because tension varies between crocheters.
By the crochetpatterns.io editorial team · Updated · Editorial policy
| Metric | US | Old UK | Suits yarn weights |
|---|---|---|---|
| 12 mm | — | — | #6 Super Bulky |
What is a 12 mm crochet hook in US and UK sizes?
A 12 mm hook is not given a standard US letter size and has no old UK equivalent. 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 |
|---|---|---|---|
| 10 mm | N/P-15 | 000 | #6 |
| 11.5 mm | P-16 | — | #6 |
| 12 mm (this hook) | — | — | #6 |
| 15 mm | P/Q | — | #6, #7 |
| 16 mm | Q | — | #7 |
What yarn weight goes with a 12 mm hook?
A 12 mm hook is typically used with super bulky (#6) yarn. Super Bulky yarn gives about 7–9 sc per 4 in / 10 cm and suits chunky blankets, baskets, oversized scarves.
| Weight | Also called | Crochet gauge | Recommended hooks |
|---|---|---|---|
| #6 Super Bulky | Super chunky, Roving, 14-ply (AU/NZ, approximate) | 7–9 sc per 4 in / 10 cm | 9–15 mm |
Sources and scope
- Craft Yarn Council: Hooks & Needles
Reference for metric and US hook sizes. Letter and number labels vary between manufacturers; check the millimetre measurement. Old UK sizes are a separate historical convention.
- Craft Yarn Council: Standard Yarn Weight System
Source for categories 0–7 and the crochet gauge and hook ranges. These are starting guidelines; use the gauge in your pattern. Regional ply names and yards per 100 g are approximate comparisons, not CYC specifications.