A 15mm crochet hook is a US P/Q. It’s a common size for jumbo weight yarn; check it by mm first, since letter labeling gets inconsistent at this end of the chart.
What is a 15mm crochet hook used for?
This size pairs with jumbo yarn most often, and the exact fabric it produces depends more on your own tension than the label on the hook. Swatch a small square before trusting any single size for a project that needs to fit.
- Yarn weight: jumbo.
- Common projects: match the weight above to garments, amigurumi, or blankets depending on the density you want.
How 15mm compares to nearby sizes
Compared to the nearest standard size, a 12mm hook (12mm) produces a tighter, denser fabric in the same yarn. Reach past it only when a pattern specifically calls for the difference. My rule of thumb is to size down for anything that needs to hold stuffing or structure, and size up for anything meant to drape.
Frequently asked questions
What letter is a 15mm crochet hook?
A 15mm hook is a US P/Q.
What yarn weight uses a 15mm hook?
Jumbo weight yarn is the usual match for a 15mm hook, though a gauge swatch is more reliable than the label on any given skein.
See the full hook size chart
Compare 15mm against every other mm, US, and UK size in one table.