Caffeine Half-Life Calculator

Track Your Caffeine Metabolism

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Caffeine Level Calculator

Calculate remaining caffeine in your system based on consumption time

Remaining Caffeine: -

Time to Desired Level

Calculate time needed to reach a specific caffeine level

Time to Reach Level: -

Daily Intake Calculator

Track your daily caffeine intake and compare to recommended limits

Daily Total: -

Understanding Caffeine Metabolism

What is Caffeine Half-Life?

Caffeine half-life is the time it takes for half of the consumed caffeine to be eliminated from your body. For most healthy adults, this is approximately 5 hours, though it can vary from 1.5 to 9.5 hours based on various factors.

Factors Affecting Metabolism

  • Age
  • Body weight
  • Liver function
  • Pregnancy status
  • Medications
  • Smoking status

Safe Consumption Limits

Recommended daily limits:

  • Healthy Adults: 400mg
  • Pregnant Women: 200mg
  • Adolescents: 100mg

Effects on Sleep

Caffeine can affect sleep quality even 6-8 hours after consumption. Consider stopping caffeine intake by early afternoon for better sleep quality.

Common Caffeine Sources

Coffee Drinks

  • Brewed Coffee (8 oz): 95mg
  • Espresso (1 oz): 47mg
  • Instant Coffee (8 oz): 62mg

Tea Varieties

  • Black Tea (8 oz): 47mg
  • Green Tea (8 oz): 26mg
  • White Tea (8 oz): 28mg

Other Sources

  • Energy Drinks (8 oz): 80mg
  • Soft Drinks (12 oz): 35mg
  • Dark Chocolate (1 oz): 12mg