OK. A little bit confused here. If I have a single shot basket, say 7-9 grams. At 1:2 ratio you have a 14-18 gram/ml shot. However a single shot is suppose to be 30 ml/grams. Same thing with a double shot. What is correct?
Thanks

Nominally, a single is 7 grams and a double 14 grams of coffee. Of course, this is only a starting point. When dialing in the grinder and tasting, such "standards" go out the window along with other standards such as brew ratio, temperature and so on. For brew ratios, here's a good article. https://home.lamarzoccousa.com/brew-rat ... und-world/.

So, a single at 2:1 is 14 grams out A double at 2:1 is 28 grams out. But this is only nominally.

tag1260 wrote:OK. A little bit confused here. If I have a single shot basket, say 7-9 grams. At 1:2 ratio you have a 14-18 gram/ml shot. However a single shot is suppose to be 30 ml/grams. Same thing with a double shot. What is correct?
Thanks

Both. The traditional 30ml/14g-18g numbers include crema. (14ml-18ml is wrong.)