How to Use the Caffeine Daily Intake Calculator
Caffeine helps with alertness and focus, but too much causes anxiety, insomnia, heart palpitations, and elevated blood pressure. The FDA recommends a maximum of 400mg per day for healthy adults. Pregnant women and teens have lower limits.
Weight-based calculation: healthy adults should stay under 5.7mg/kg (max 400mg); teens under 2.5mg/kg (max 100mg); pregnant women under 200mg regardless of weight. A typical 12 oz drip coffee contains about 145mg — roughly 2.5 cups is the daily limit for most adults.
Frequently Asked Questions
Common symptoms include anxiety, jitteriness, heart palpitations, insomnia, headaches, and upset stomach. Severe overconsumption can cause nausea or dizziness.
Yes — decaf typically contains 2–15mg per cup, far less than regular coffee but not zero.
200mg per day or less is the recommended limit during pregnancy. That's roughly one 12 oz cup of drip coffee.