CaffSenseHow Much Caffeine Is Too Much?
For most healthy adults, the U.S. FDA points to about 400 mg of caffeine a day — roughly four cups of brewed coffee — as a level not generally linked to negative effects.
General daily reference points
| Group | Common daily guidance |
|---|---|
| Healthy adults | up to ~400 mg |
| Pregnancy | up to ~200 mg |
| Adolescents | lower; caution advised |
General references, not personal advice. Sensitivity varies widely; talk to a healthcare professional about your situation.
What 400 mg looks like
Roughly four 240 ml coffees (~95 mg each), or about five energy drinks (~80 mg), or a mix. See the full breakdown in caffeine in coffee, tea & energy drinks. Large takeaway cups and pre-workout can push you toward the limit faster than you'd expect.
Signs you may be having too much
- Jitteriness, a racing heart, or anxiety
- Upset stomach
- Trouble falling or staying asleep
- Needing caffeine just to feel normal
It's not just the total — it's the timing
Even within a safe daily amount, caffeine late in the day can disturb sleep. Two people at 300 mg/day can sleep very differently if one stops at noon and the other at 6 pm. See when to stop drinking coffee before bed and how long caffeine stays in your system.
Sources
- FDA — ~400 mg/day for healthy adults.
- EFSA (2015) — caffeine safety, including pregnancy.
This article is observational wellness information only, not medical advice, and should not be used to diagnose, treat, cure, or prevent any condition. For guidance about your own caffeine intake, consult a qualified professional.