← All Calculators

Caffeine Calculator

Current caffeine level, safe sleep time, and daily limit — based on your drinks and caffeine half-life.

Drinks consumed today

Ad

Daily nutrition made simple — vitamins, probiotics & adaptogens in one scoop.

Try AG1

Current caffeine level

95mg

Total intake today

95mg

Safe to sleep from

05:02

FDA daily limit (400 mg)

24%

Within FDA daily limit

Caffeine decay over time

Caffeine half-life: ~5 hours

Now
95
+2h
72
+4h
54
+6h
41
+8h
31
< 100 mg — safe to sleep

Read more

Caffeine Calculator: How Long Until You Can Sleep? →

Caffeine has a half-life of ~5 hours. Calculate your current caffeine level and find out when you can safely fall asleep tonight.