Contrary to popular belief espresso is not that high in caffeine compared to how much of it you would typically drink. When dilluted with milk or water back down to regular strength (by flavor) it is actually usually lower in caffeine than a typical medium roast drip. Light roast can be very high especially if you brew at 60g of coffee per liter of water that seems to have become popular with internet coffee enthusiasts.
I had to convert it I think that is around 1/4 cup per 6 cups (6 oz for some reason on coffee makers) . I use twice that but measured in dry beans. Is that really that much?
I think your conversion may be wrong. 60g per liter is 15g for 250ml (which is a small mug of coffee). At least with my coffee 15g occupies most of the quarter cup scoop I have been using. The flavor is good at that strength, but it’s a lot of caffeine. In the ballpark of 200mg depending on the beans and how well your brew method extracts it. 200mg is fine on its own but most people drink a few cups in a day.
