Caffeine

Cold brew typically contains 150–300 mg of caffeine per 12 oz serving — often more than the same volume of hot drip coffee (150–200 mg). The key variable is whether you’re drinking straight cold brew concentrate (higher) or a diluted ready-to-drink version (comparable to drip). The range is wide because cold brew caffeine depends on three things: the coffee-to-water ratio used during steeping, whether you dilute the concentrate before drinking, and the caffeine content of the specific beans. Here is how to understand exactly what is in your cup. ...

A red eye coffee is a cup of regular drip coffee with one shot of espresso added. It combines the larger volume of brewed coffee with the concentrated intensity of espresso — giving you a significantly stronger, more caffeinated drink than either alone. The name comes from red-eye flights: long overnight trips that leave passengers exhausted and red-eyed by morning. The drink became popular at airport coffee bars as a fast, high-caffeine solution for sleep-deprived travelers. ...

A single shot of espresso (1 oz / 30 ml) contains 63–75 mg of caffeine. A double shot (doppio) contains 126–150 mg. That’s less than most people expect — and less than a standard 8 oz drip coffee, which averages 95 mg. The confusion comes from concentration: espresso is highly concentrated, but you drink far less of it. Espresso Caffeine by Shot Type Shot Type Volume Caffeine Single shot (solo) 1 oz / 30 ml 63–75 mg Double shot (doppio) 2 oz / 60 ml 126–150 mg Ristretto (short shot) 0.75 oz / 22 ml ~50–65 mg Lungo (long shot) 1.5 oz / 45 ml ~75–90 mg Note: The FDA considers up to 400 mg/day safe for healthy adults. That’s roughly 5–6 single espresso shots. ...