Calculate your caffeine intake and effects
The calculator multiplies the number of each drink type by its average caffeine content: Espresso (63mg per shot), Regular Coffee (95mg per 8oz), Latte/Mocha (75mg), Energy Drinks (150mg). It sums these values to give your total daily caffeine intake and compares it to recommended limits.
While moderate caffeine consumption (up to 400mg daily for most adults) is generally safe, excessive intake can cause anxiety, insomnia, rapid heartbeat, and digestive issues. Tracking helps you stay within healthy limits and understand how caffeine affects your sleep and overall wellbeing.
Caffeine's half-life is about 5 hours, meaning half the caffeine remains in your system 5 hours after consumption. Individual metabolism varies based on weight, genetics, medications, and pregnancy. The calculator provides a general estimate - some people metabolize caffeine faster or slower than average.
Limit intake to 400mg daily (200mg if pregnant). Avoid caffeine after 2 PM to protect sleep quality. Stay hydrated - caffeine is a diuretic. Be aware of hidden caffeine in chocolate, medications, and some teas. If you experience jitters, anxiety, or sleep issues, reduce your intake gradually to avoid withdrawal headaches.
For most healthy adults, up to 400 milligrams of caffeine per day is considered safe by the FDA and major health organizations. This is roughly equivalent to four 8-ounce cups of brewed coffee. Pregnant women should limit intake to 200mg per day, and children and adolescents should consume significantly less based on body weight.
Caffeine has a half-life of approximately 5 hours, meaning half the caffeine you consume is still in your body 5 hours later. It takes roughly 10 to 12 hours for caffeine to be fully eliminated from your system. This is why experts recommend avoiding caffeine after 2 PM to prevent sleep disruption.
An 8-ounce cup of brewed coffee contains about 80-100mg of caffeine, while the same amount of black tea has 40-70mg and green tea has 20-45mg. Espresso is more concentrated at roughly 63mg per 1-ounce shot. Energy drinks vary widely from 50mg to over 300mg per can. Coffee generally delivers caffeine faster, while tea provides a more gradual, sustained effect due to the presence of L-theanine.