What time do you go to sleep?
Find your last coffee time for better sleep.
Drink
Start with 6–9 hours before bed as a practical range. Larger or stronger drinks and slower caffeine clearance can move that time earlier, so use the calculator above for today's drink and bedtime.
CoffeeCutoff works backward from bedtime until your selected drink is estimated to reach the 50 mg reference point. A stronger drink, multiple servings, or the Sensitive setting takes longer. The result is a planning guide, not a claim that coffee after that time is unsafe for everyone.
Choose "Already had coffee" above and enter when and what you drank to estimate how much caffeine may remain at bedtime. You can use that estimate to avoid adding more caffeine today and compare an earlier time tomorrow, but it cannot predict exactly how you will sleep.
Yes, it can. A coffee at 3, 4, or 5 PM may still leave caffeine in your body at bedtime, especially with an early bedtime, a larger drink, or slower caffeine clearance. Use "Already had coffee" for your drink instead of treating every afternoon coffee the same.
Yes. The calculator uses the caffeine amount shown below each drink for one standard serving, but cafe sizes and brands vary. Stronger, larger, or multiple drinks usually move the cutoff earlier; increase the quantity when your total is close to multiple listed servings.
We estimate how the selected dose decreases over time using the half-life for your sensitivity, then work backward from bedtime to a shared 50 mg reference point. That reference keeps the estimate consistent; it is not a medical safety threshold, and individual responses vary. See the calculation and research