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Caffeine Tracker
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Add drinks to track your total caffeine intake against the FDA-recommended daily limit of 400mg.
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ℹ️ FDA recommends ≤ 400mg/day for healthy adults. Pregnant women: ≤ 200mg. Sensitive individuals may experience effects at lower doses.
Frequently Asked Questions
How long does caffeine stay in your system?
Caffeine has a half-life of approximately 5–6 hours in healthy adults. This means half the caffeine is metabolized in that time. After 10–12 hours, about 75% has been cleared. Individual metabolism varies based on genetics, liver function, medications, and pregnancy.
What is the safe daily caffeine limit?
Health Canada and the FDA cite 400 mg/day as generally safe for healthy adults — roughly 3–4 cups of coffee. Pregnant women are advised to limit intake to 200 mg/day. Sensitivity varies widely: some people experience anxiety or insomnia from much smaller amounts.
Why does caffeine cause a crash?
Caffeine blocks adenosine receptors, masking fatigue. When caffeine is metabolized, adenosine binds all at once, causing sudden drowsiness — the 'crash.' Sugar spikes from caffeinated drinks can amplify this. Spacing caffeine intake and staying hydrated reduces crash severity.