Enter your beverage type, serving size, and body weight to find out your total caffeine intake and how it compares to your safe daily limit. The Caffeine Content Calculator shows your total caffeine (mg), percentage of daily recommended maximum, and whether your intake is within a safe range — all broken down by drink source.
Total Caffeine Intake
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Your Safe Daily Limit
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% of Daily Limit Used
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Safety Assessment
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Caffeine Remaining Before Limit
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For healthy adults, health authorities like the FDA recommend no more than 400 mg of caffeine per day. This calculator adjusts that limit based on your body weight, using an approximate guideline of 5.7 mg per kg (2.6 mg per lb) of body weight. Pregnant women are advised to stay under 200 mg per day.
Health authorities generally recommend consuming no more than 200 mg of caffeine at one time. Spacing out your intake throughout the day is better than consuming a large amount all at once, as it reduces the risk of side effects like jitteriness, elevated heart rate, and anxiety.
Yes, in very high doses caffeine can be fatal. The estimated lethal dose is approximately 150–200 mg per kg of body weight. For a 70 kg (154 lb) adult, that would be roughly 10,500 mg — equivalent to over 100 cups of brewed coffee. While lethal doses from beverages alone are extremely rare, concentrated caffeine supplements and powders pose a genuine risk.
An 8 oz cup of brewed drip coffee typically contains around 95 mg of caffeine, though this can range from 70–140 mg depending on the roast and brewing method. Espresso has about 63 mg per 1 oz shot, while instant coffee averages around 62 mg per 8 oz serving.
Generally, no. An 8 oz cup of black tea contains about 47 mg of caffeine, and green tea has around 28 mg. Energy drinks vary widely — a standard 8.4 oz Red Bull contains about 80 mg, which is similar to a cup of coffee. Some energy drinks can contain significantly more, up to 200+ mg per can.
Health authorities recommend that children under 12 avoid caffeine entirely. Adolescents aged 12–18 should consume no more than 100 mg per day, which is roughly one small cup of coffee or two cans of cola. This calculator is designed for adults aged 18 and over.
Common symptoms of caffeine overconsumption include restlessness, insomnia, headaches, rapid or irregular heartbeat, nervousness, irritability, frequent urination, and muscle tremors. If you experience severe symptoms such as chest pain or difficulty breathing, seek medical attention immediately.
Yes, decaf coffee is not completely caffeine-free. An 8 oz cup of decaf typically contains between 2–15 mg of caffeine — significantly less than regular coffee, but still a small amount. This matters for people who are very sensitive to caffeine or need to avoid it for medical reasons.