Last week we saw that a cup of coffee typically has more caffeine than a cup of tea. So now we follow up with whether regularly brewed coffee or espresso contains more caffeine. Coffee is properly brewed at about 50grams per liter (although this is quite strong to many), while espresso is brewed at around 233grams per liter (assuming 7grams per each 1 fluid ounce shot). Therefore espresso is more concentrated with coffee solubles and has about four to five times the concentration of caffeine compared to regularly brewed coffee (per unit volume). Now however we must consider portion size, because even though I sometimes think I could really go for 16ounces of espresso (approximately 16 shots), It's doubtful I would finish it. While I could probably drink 16ounces of regularly brewed coffee without even realizing it or giving it time to cool.