Caffeine Intake Calculator
Calculate caffeine intake from beverage types and amounts. Useful for health management, sleep management, and intake control.
mL
Calculation Result
Please add beverages
Caffeine Intake Guidelines
• Adults: Up to 400mg per day
• Pregnant: Up to 200mg per day
• Children: Up to 2.5mg per kg body weight
• Adolescents: Up to 100mg per day
※Individual differences exist. Adjust according to your condition
Caffeine Content in Common Beverages (per 100mL)
High Caffeine
- Espresso (200mg/100mL): 200mg
- Matcha (64mg/100mL): 64mg
- Coffee (60mg/100mL): 60mg
Medium Caffeine
- Instant Coffee (57mg/100mL): 57mg
- Energy Drink (32mg/100mL): 32mg
- Black Tea (30mg/100mL): 30mg
Low Caffeine
- Green Tea (20mg/100mL)・Oolong Tea (20mg/100mL): 20mg
- Cola (10mg/100mL): 10mg
- Decaf Coffee (3mg/100mL): 3mg
How to Use
- Select beverage type and enter the amount consumed (mL).
- For multiple beverages, use '＋Add Beverage' to add more.
- Press 'Calculate Caffeine Intake' to check total intake and health impact.
Important Notes
- Caffeine content is a general guideline and varies greatly by product and brewing method.
- Individual differences (weight, age, tolerance) greatly affect caffeine impact.
- Pregnant/nursing women and those with heart conditions should follow medical advice.
- Caffeine intake within 6 hours of bedtime may affect sleep quality.
- This tool is for health management reference and does not replace medical diagnosis.
Tips & FAQ
- What is caffeine?
A naturally occurring stimulant compound found in coffee beans, tea leaves, etc. It stimulates the central nervous system, providing alertness and improved concentration. - How long do caffeine effects last?
Effects appear 30 minutes to 1 hour after consumption, with a half-life of about 3-5 hours. Complete elimination takes 6-8 hours. - What happens with too much caffeine?
Symptoms may include insomnia, anxiety, headaches, palpitations, gastrointestinal issues. Severe cases can lead to caffeine toxicity. - Is decaf really caffeine-free?
Not completely zero. While 97%+ is removed from regular coffee, small amounts (about 3mg/100mL) remain. - Caffeine limits for children and pregnant women?
Pregnant women: up to 200mg/day, children: up to 2.5mg per kg body weight, adolescents: up to 100mg/day are recommended.
This information is general guidance. Consult doctors, nutritionists, or medical institutions for detailed advice.