In England, pubs usually sell "small", "medium" or "large" glasses of wine, which are 125mL, 150mL and 250mL. ([1] for good evidence for this, that you can buy measures for it. There's also a law [2].)

But the comparisons in this discussion are all confused, as the first person wrote "US measuring cup" but used UK alcohol "units" (which are 10mL = 6g), but the US "standard drink" contains 11g = 18mL alcohol.

UK units are nicer to calculate, as an example 150mL glass of 13% wine contains 150 × 13 ÷ 1000 → 1.95 "units" alcohol (19.5mL).

But the US standard drink is probably nearer to what people actually consider one drink. The UK site shows that typical drinks are nearer 2-3 units [3].

[1] https://www.wineware.co.uk/professional-stainless-steel-thim...

[2] https://www.gov.uk/weights-measures-and-packaging-the-law/sp...

[3] https://www.nhs.uk/live-well/alcohol-support/calculating-alc...

Yeah, sorry, I was trying to use the "measuring cup" for familiar reference purposes. The 10 ml of alcohol measure in the UK (with 1-2 units being the "safe" range) definitely seems a lot clearer and easier to approximate if your drink has an ABV % to me than the "standard drink which is all over the place: https://en.wikipedia.org/wiki/Standard_drink

"For example, in the United States, a standard drink contains about 14 grams of alcohol." "Different countries define standard drinks differently. For example, in Australia, a standard drink contains 10 grams of alcohol,[4] but in Japan, one "unit" contains approximately 20 grams."

But, ok, yeah, I'm sorry. I'd perked up and replied to parent because the "2 standard unit 20ml limit" as "safe" seems to show up in a bunch of studies, and interpreted "2 drinks" as that. But if he meant US standard drink that would be a 1.7*2 units (or 2 5% beer bottles), which is a bit harder to hit (but also firmly in unhealthy territory). That said, as another person noted, you can blow through that with a high ABV craft beer really easily (or an overly full glass of wine).

It's a very large glass of wine, yes. That said, I've been in restaurants with large wine glasses that generously fill them.

I guess if you're paying by the bottle who cares. Ensures more consumption?

And, was more noting how people could deceive themselves. I just fetched one of the large wine glasses from the kitchen. Filled but well below the rim (maybe a couple of cm below) it was 2 cups of water (so 6 units!) - I emptied out the water and filled it with 1 cup of water (so well over the 2 units) the glass was less than half full. Visually looked about a third of the way up the glass due to the curve.