Caffeine Calculator
Calculate your caffeine intake, half-life, and optimal cutoff time for sleep. Track tolerance and find your ideal caffeine strategy.
Medical Disclaimer
This calculator provides general estimates for informational purposes only and does not constitute medical advice. Results should not be used for diagnosis or treatment decisions. Always consult a qualified healthcare professional or registered dietitian before making changes to your diet, exercise, or health routine.
Frequently Asked Questions
What is caffeine half-life?
Caffeine half-life is 5-6 hours for most adults. If you have 200mg at 2pm, you still have 100mg at 8pm and 50mg at 2am.
When should I stop drinking coffee?
Stop caffeine 8-10 hours before bedtime for optimal sleep. For 10pm bedtime, your cutoff is 12-2pm.
How much caffeine is too much?
Up to 400mg daily (about 4 cups coffee) is safe for most adults. Pregnant women should limit to 200mg. Individual tolerance varies.
Does caffeine tolerance reset?
Tolerance develops in 1-2 weeks of daily use. A 7-12 day break can reset tolerance, making caffeine effective again at lower doses.
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