Estimate the caffeine content in your coffee. Values are approximate and vary by bean type, roast, and brewing method.
⚠️ Health Disclaimer: 400mg/day is the FDA guideline for healthy adults. Pregnant/nursing individuals should limit to 200mg. Children, those with heart conditions, or caffeine-sensitive individuals should consult a healthcare provider. Individual tolerance varies significantly.
Last updated: March 2026
*For healthy adults only
All values are estimates. Actual caffeine varies ±20% by bean, roast, and brewing method.
Caffeine is a natural stimulant found in coffee beans, tea leaves, and cocoa pods. It works by blocking adenosine receptors in the brain, which prevents drowsiness and increases alertness. While caffeine has many benefits, including improved focus and physical performance, excessive intake can lead to jitters, insomnia, and increased heart rate.
The amount of caffeine in your cup depends on several factors: bean variety (Robusta has ~2× the caffeine of Arabica), roast level (minimal effect—light and dark roasts have nearly identical caffeine when brewed by weight), and brewing method. Espresso is the most concentrated per ounce, but a 12oz drip coffee typically contains more total caffeine than a double shot due to the larger serving size.
Drip coffee has ~13.5 mg/oz, espresso has ~65 mg per shot, cold brew RTD has ~15 mg/oz, and instant coffee has ~9 mg/oz when prepared. Caffeine content varies by bean variety, roast level (minimal effect), and brewing method. These are averages; actual amounts vary.
The FDA recommends 400mg/day as safe for healthy adults. However, individual tolerance varies significantly. Pregnant or nursing individuals should limit to 200mg/day. Those with heart conditions, anxiety, or caffeine sensitivity should consult a healthcare provider.
Decaffeination removes 97-99% of caffeine but not all. A typical 8oz cup of decaf has 2-5 mg of caffeine. If you're very sensitive, limit decaf intake or avoid it entirely. Decaf removes some flavor compounds too, affecting taste.
Cold brew concentrate has 150-200 mg per serving (varies by brand and brewing strength). Always read the label and dilute according to instructions. When diluted to drink strength, it's similar to regular brewed coffee but more concentrated if consumed undiluted.
Roast level has minimal effect on caffeine content—light and dark roasts contain nearly identical caffeine when brewed by weight. The myth persists because dark roast's bolder taste feels more caffeinated, but it's not. Bean variety matters much more (Robusta has ~2× Arabica's caffeine).
Caffeine typically takes 15-45 minutes to enter the bloodstream and reach peak levels. Peak effects occur around 30-60 minutes. Half-life is 5-6 hours (varies by metabolism), meaning half the caffeine remains after 6 hours. Avoid coffee after early afternoon if you value sleep.
Absolutely. Even small amounts of caffeine can disrupt sleep if consumed late in the day. For optimal sleep, avoid caffeine after 2-3 PM. Caffeine residue (half-life of 5-6 hours) means a 4 PM coffee still has caffeine in your system at bedtime.
Mild symptoms (jitters, anxiety) usually pass. Stay hydrated and eat a small snack with sugar or carbs. Severe symptoms (heart palpitations, chest pain) require medical attention. Long-term excess consumption can increase anxiety and insomnia. Gradually reduce intake if over-consuming.