Your Sleep Profile
Sleep Impact Analysis
Saved Estimates
Your estimates are saved automatically.
Find your personal caffeine cutoff time. Know exactly when to stop drinking coffee for optimal sleep.
Your estimates are saved automatically.
The estimator calculates your personalized caffeine cutoff time based on your bedtime, sensitivity level, and last dose. It uses a 5-hour log₂ clearance model: hours to clear = 5 × log₂(dose/threshold), where threshold is 50mg (high), 100mg (medium), or 200mg (low) sensitivity.
Set your target bedtime, select your sleep sensitivity (High if even 50mg disrupts you), and enter your last caffeine dose. Click Calculate to see your recommended cutoff time and predicted sleep impact.
• High sensitivity = cutoff 6-8 hours before bed.
• Medium sensitivity = cutoff 4-5 hours before bed.
• Low sensitivity = cutoff 2-3 hours before bed.
• Save estimates to track how sensitivity changes over time.