How to Use the Daily Caffeine Limit Calculator
Enter your body weight and pregnancy status to see your recommended daily maximum caffeine intake based on FDA and ACOG guidelines. The calculator also shows how many common beverages fit within that limit.
Daily Caffeine Limits by Group (FDA / ACOG)
| Group | Daily Maximum |
|---|---|
| Healthy adults | 400 mg |
| Pregnant women | 200 mg (ACOG) |
| Teens (12–18) | ~100 mg (2.5 mg/kg) |
Caffeine Content of Common Drinks
| Drink | Caffeine |
|---|---|
| Brewed coffee (8 oz) | ~95 mg |
| Espresso (1 shot) | ~63 mg |
| Energy drink (8.4 oz) | ~80 mg |
| Cola (12 oz) | ~34 mg |
| Green tea (8 oz) | ~28 mg |
Frequently Asked Questions
What is the safe limit for adults?
The FDA recommends up to 400 mg per day for healthy adults — about 4 cups of brewed coffee.
How much is safe during pregnancy?
ACOG recommends less than 200 mg per day. Caffeine crosses the placenta and may affect fetal development.
What are signs of caffeine overconsumption?
Palpitations, insomnia, anxiety, headaches, and digestive issues. Severe cases can raise blood pressure significantly.