“One coffee” can mean 60 mg or 300 mg. Here are typical amounts from Mayo Clinic and CSPI data — useful for staying under your daily limit.
Typical caffeine per serving
- Drip coffee (8 oz): ~70–100 mg
- Espresso (1 shot): ~63–80 mg — strongest per ounce
- Cold brew (8 oz): ~100–200 mg
- Black tea: ~47–55 mg · Green tea: ~28–35 mg
- Energy drink (8 oz, e.g. Red Bull): ~80 mg
- Energy shot (5-Hour Energy): ~200 mg
- Cola (12 oz): ~35–40 mg
Two things that trip people up
First, size: a 16 oz café coffee can hold 2–3 “cups” of caffeine. Second, espresso feels stronger but a single shot often has less total caffeine than a mug of drip — it's just concentrated.
Caffy has these drinks (and hundreds more) built in, so logging is a tap — and it adds each one to your live caffeine level.