@kpfssport here's a really handy chart I use for conversions like that!
https://www.laughinghens.com/yarn-conversion-chart
Looks like worsted (US) is equivalent to Aran (UK).
And here's my go-to for figuring out hook sizing:
https://creamofthecropcrochet.com/yarn-weight-and-crochet-hook-size-chart/
FWIW, this is highly variable by person. I tend to keep fairly tight tension so I usually end up on the larger end of the size range to get my gauge swatches right..