카페인 실시간 누적 계산기 수동 기록으로 반감기 곡선과 취침 전 기준 확인
Step 1: Add a manual intake record
This is a manual log, not a background tracker. Once the page is closed, it cannot keep monitoring you; add a record after each drink.
1 means one default serving; use 0.5 or 1.5 for a half cup or a large drink.
Default is 5 hours; real values vary widely by metabolism, medication, age and genetics.
Default 50 mg is only a general reference, not a safety or medical line.
Current estimate
Estimated with Σ dose × 0.5^((now−intake time)/half-life).
Below the common adult 400 mg/day reference limit.
Uses 50 mg as a bedtime remaining-caffeine reference line.
Records are stored only in this browser's localStorage. They may disappear if you switch devices, clear data, or use private browsing.
Next 24 hours caffeine decay curve
The curve uses only the records you manually entered and the half-life setting; it cannot know about drinks you did not log.
Today's records
Honest disclaimer and health notes
- A common adult reference limit is about 400 mg/day (FDA/EFSA), but individual tolerance varies greatly.
- This tool is for manual logging and general information only. It is not medical advice and cannot diagnose sleep, anxiety, or cardiovascular issues.
- Pregnancy, trying to conceive, breastfeeding, teens, arrhythmia, medication use, or caffeine sensitivity may require different limits; follow medical or local official guidance.
카페인 실시간 누적 계산기
이 도구는 수동 기록과 감소 곡선을 보여주는 도구이며, 백그라운드에서 계속 작동하는 건강 추적기가 아닙니다. 커피, 차, 에너지 드링크, 콜라 또는 직접 입력한 mg을 마실 때마다 직접 추가해 주세요. 페이지를 닫으면 정적 프런트엔드는 추적을 계속할 수 없습니다.
Caffeine half-life / 咖啡因半衰期
카페인 반감기는 보통 몇 시간 단위로 설명되지만 간 대사, 나이, 약물, 유전적 차이에 따라 크게 달라집니다. 기본값은 5시간이며 성인 일반 기준으로 하루 약 400mg을 함께 표시합니다. 참고 자료: Wikipedia: Caffeine、FDA caffeine guidance、EFSA caffeine topic
How the 24-hour decay curve works
The calculator uses remaining = Σ dose × 0.5^((t−intakeTime)/halfLife) for the records you manually enter. The dashed line is a bedtime reference threshold, defaulting to about 50 mg. It is a planning aid, not a medical safety line, and it cannot include drinks you forgot to record.
Privacy and related tools
기록은 이 브라우저의 localStorage에만 저장되며, 데이터를 지우거나 기기를 바꾸면 사라질 수 있습니다. You can also compare food and drink context with 한국어 Food Calories tool.
Important disclaimer
This is not medical advice. Pregnancy, breastfeeding, teens, heart rhythm issues, anxiety sensitivity, liver conditions, and medication interactions may require different caffeine limits; follow a qualified clinician or your local official guidance.
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