Where do these caffeine values come from?
These are approximate caffeine amounts per standard serving for common drinks and foods, compiled from general reference data published by sources such as the U.S. Food and Drug Administration (FDA) and the Mayo Clinic. Actual content can vary significantly by brand, bean type, and brewing method.
What are the recommended limits?
- Healthy adults: up to 400mg per day (U.S. FDA guidance)
- Pregnant / breastfeeding: up to 200mg per day (American College of Obstetricians and Gynecologists guidance)
- Adolescents: there's no single official global limit, but many guidelines recommend staying under 2.5mg per kg of body weight (shown here as roughly 150mg for reference, based on a 60kg body weight).
A note of caution
This calculator provides general reference information β your ideal caffeine limit can vary a lot depending on your personal sensitivity and health conditions (heart conditions, anxiety disorders, pregnancy, etc.). If you have health concerns about caffeine, please talk to a healthcare provider. Everything you enter is calculated in your browser and is never stored or transmitted.
Frequently Asked Questions
Why does caffeine affect people so differently?
The activity of the liver enzyme (CYP1A2) that breaks down caffeine varies genetically from person to person, which can lead to large differences in metabolism speed and sensitivity even at the same dose. Smoking status, pregnancy, and certain medications also affect how quickly caffeine is metabolized.
I tapped the wrong drink by mistake β how do I remove it?
In the "Today's drinks" list, click the β button next to each item to reduce the count; it disappears from the list once it reaches zero.