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Coffee Caffeine Content and Half-Life Calculator

Caffeine remaining = C₀ × 0.5^(t/5.7).

Calculates remaining caffeine in your system after a given time using the caffeine half-life of approximately 5.7 hours. Useful for timing coffee consumption.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

C(t) = C₀ × (0.5)^(t / 5.7); half-life ≈ 5.7 h

In depth

Calculates remaining caffeine in your system after a given time using the caffeine half-life of approximately 5.7 hours. Useful for timing coffee consumption.