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Caffeine calculator
Add up your caffeine, see how much is left at bedtime and find your caffeine cutoff.
What do you drink in a day?
- Espresso · 63 mg0
- Coffee (250 ml) · 95 mg2
- Black tea · 47 mg0
- Green tea · 28 mg0
- Cola (355 ml) · 34 mg0
- Energy drink (250 ml) · 80 mg0
15:00
23:00
Caffeine per day
190mg
Within the 400 mg/day limit for most adults.
Still in your body at bedtime
≈ 49mg
Caffeine has a half-life of about 5 hours.
Your caffeine cutoff
15:00
About 8 hours before bed to protect deep sleep.
Pregnant people should stay under 300 mg a day. Sensitivity varies a lot between people.
General estimates for educational purposes only — not medical advice. If you have a health condition, talk to a qualified professional.
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