Track your daily caffeine consumption from coffee, tea, and other sources and compare to safe limits
This calculator is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.
Caffeine is the most widely consumed psychoactive substance in the world, found in coffee, tea, energy drinks, cola, and chocolate. While moderate caffeine intake is generally considered safe for most adults, consuming too much can lead to anxiety, insomnia, digestive problems, rapid heartbeat, and dependency. Understanding how much caffeine you consume each day is the first step towards managing your intake responsibly. The European Food Safety Authority (EFSA) has established a safe upper limit of 400mg of caffeine per day for healthy adults. This is roughly equivalent to four cups of filter coffee or eight cups of tea. For pregnant and breastfeeding women, the NHS recommends a lower limit of 200mg per day, as high caffeine intake has been linked to low birth weight and, in extreme cases, miscarriage. Children and adolescents are also advised to limit caffeine, though specific UK guidelines are less well defined. This calculator helps you track your daily caffeine intake from common sources and compares it to recommended safe limits. It accounts for the approximate caffeine content of each beverage type and provides a clear indication of whether you are within, approaching, or exceeding your daily limit. Remember that individual sensitivity to caffeine varies, and some people may experience adverse effects at lower doses.
To calculate your daily caffeine intake: 1. Enter the number of cups of coffee you drink per day. This calculator uses an average of 80mg per cup, which is a reasonable estimate between filter coffee (95mg) and instant coffee (63mg). 2. Enter the number of cups of tea you drink. A standard cup of tea contains approximately 47mg of caffeine. 3. Enter the number of energy drinks you consume. A typical 250ml energy drink contains around 80mg of caffeine, though some brands contain significantly more. 4. Enter the number of cola servings (330ml cans). A standard cola contains approximately 32mg of caffeine per can. 5. Enter the number of dark chocolate bars (40g serving). Dark chocolate contains roughly 43mg of caffeine per 40g bar. 6. If you are pregnant or breastfeeding, toggle the pregnancy option to use the lower NHS pregnancy limit of 200mg instead of the standard 400mg adult limit. 7. View your results. The calculator shows your total daily caffeine intake, what percentage of the recommended limit you have reached, how much more you can safely consume, and a breakdown by source.
The calculator multiplies the number of servings of each caffeinated item by its approximate caffeine content: Coffee: 80mg per cup (average of filter and instant) Tea: 47mg per cup Energy drink: 80mg per 250ml can Cola: 32mg per 330ml serving Dark chocolate: 43mg per 40g bar Total daily caffeine = sum of all sources. The result is compared against the appropriate daily limit: 400mg for healthy adults (EFSA recommendation) or 200mg for pregnant women (NHS recommendation). The status is determined by the percentage of the limit consumed: under 80% is "Within limit", 80-100% is "Approaching limit", and over 100% is "Over limit". Caffeine has a biological half-life of approximately 5 to 6 hours, meaning that half of the caffeine from a drink consumed at midday will still be in your system at 5 or 6 in the evening. This is why timing of caffeine consumption matters for sleep quality.
Caffeine content varies significantly between brands and preparation methods. Espresso-based drinks from coffee shops may contain 63mg per single shot or 126mg per double shot. Cold brew coffee can contain 150-200mg per serving. Some energy drinks contain up to 300mg per can. This calculator uses average values as a practical guide. The NHS advises that caffeine can affect people differently depending on body weight, medication use, and individual sensitivity. If you experience anxiety, jitteriness, heart palpitations, or sleep problems, consider reducing your caffeine intake even if you are within the recommended limit. Sources: EFSA Scientific Opinion on caffeine safety (2015), NHS guidance on caffeine and pregnancy, British Dietetic Association caffeine fact sheet.