Caffeine Half-Life & Clearance Time Calculator

Enter the time and amount of caffeine consumed to see when it will drop below alert/sleep-interfering levels.

★★★★★4.8(1,247 ratings)

Caffeine Source

Half-Life (hours, typically 5-6)

Time to reach safe sleep level (<25 mg)

10.6 hours

Hours after	Caffeine (mg)	Effect
0 hrs	95.0	Mildly alert
2 hrs	73.8	Mildly alert
4 hrs	57.4	Mildly alert
6 hrs	44.6	Slight effect
8 hrs	34.7	Slight effect
10 hrs	26.9	Slight effect
12 hrs	20.9	Negligible
16 hrs	12.6	Negligible
20 hrs	7.6	Negligible
24 hrs	4.6	Negligible

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How to Use This Caffeine Half-Life Calculator

Enter caffeine amountInput milligrams consumed.
Enter time of consumptionInput when you had caffeine.
View clearanceSee caffeine level over time.

Common Use Cases

Health
Sleep
Coffee
Wellness

Frequently Asked Questions

This tool is for informational purposes only. Read our disclaimer.

Need help with this tool? help@bodhins.com

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