Caffeine Intake Calculator

Tracking Daily Caffeine Intake

Caffeine is found in coffee, tea, energy drinks, chocolate, and many pre-workout supplements. Tracking your total daily intake across all sources helps you stay aware of how much caffeine you consume throughout the day.

The commonly referenced daily intake level for adults is 400 mg, as noted by the FDA. Individual responses to caffeine vary widely based on genetics, habitual use, body weight, and other factors.

Caffeine and Exercise

The International Society of Sports Nutrition (ISSN) position stand notes that caffeine in the range of 3–6 mg per kilogram of body weight is the commonly studied ergogenic range when consumed approximately 30–60 minutes before exercise. This calculator shows your personalized mg range based on your body weight.

For tracking how long caffeine stays in your system, see our Caffeine Half-Life Calculator, which models decay over 24 hours with multi-dose support.

Understanding mg/kg

Expressing caffeine relative to body weight (milligrams per kilogram) provides better context than absolute milligrams alone. A 200 mg intake has different significance for someone weighing 60 kg versus 100 kg. This calculator displays both absolute and weight-adjusted values.

• Below 3 mg/kg: Low daily intake relative to body weight
• 3–6 mg/kg: Moderate daily intake — within the ISSN studied ergogenic range
• Above 6 mg/kg: High daily intake relative to body weight

How to Use This Calculator

1. Enter your body weight
2. Add each caffeine source you consume during the day (coffee, tea, energy drinks, supplements)
3. Set the number of servings for each source
4. Click "Calculate Intake" to see your daily total, mg/kg ratio, and sensitivity tier
5. Review the visual gauge showing your intake relative to the 400 mg reference

Related tools: Caffeine Half-Life Calculator, Calorie Intake Calculator, Macro Calculator