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Caffeine Half-Life Tracker

Model caffeine as exponential decay over your drinks to get the level at bedtime and when it clears.

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Caffeine Half-Life Tracker works straight from this page — free, instant, nothing to install. Its place is under Chemistry; Half-life calculator and Battery life calculator answer the questions closest to this one.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Caffeine Half-Life Tracker do?

Model caffeine as exponential decay over your drinks to get the level at bedtime and when it clears.

When would I actually use this?

Preparing a solution at a stated concentration, working out how much of a reagent a reaction needs, and converting between mass, moles and volume.

What is the most common mistake?

Confusing molarity with molality. One is per litre of solution and the other per kilogram of solvent; they diverge as concentration rises, and only one of them is temperature-independent.

How is Caffeine Half-Life Tracker different from Half-life calculator?

They sit next to each other but answer different questions: Half-life calculator is the one to open when you need it to compute how much of a substance remains after a time, given its half-life. Pick whichever matches what you're starting from — both are free.

Where do the figures come from?

Atomic masses are the IUPAC standard values. Results assume ideal behaviour and standard conditions unless the tool says otherwise — real solutions deviate, and lab work needs lab measurement.

Further reading

All guides →
ExplainerCaffeine Half-Life: Why Your Afternoon Coffee Is Still There at MidnightCaffeine leaves by first-order kinetics, so what remains is the dose times one half to the power of elapsed time over half-life. The half-life is not a constant — it varies by multiples between people, and that is the whole story.ExplainerHow Half-Life Works: What Is Left After 1, 3 and 10 Half-LivesOne half-life leaves 50%, three leave 12.5%, ten leave less than a tenth of a percent. The formula is a single line — the part worth understanding is why the answer never reaches zero.ExplainerCaffeine Against Sleep Pressure: What It Blocks, and What It CannotSleep is regulated by two processes: a pressure that builds with every waking hour, and a clock. Caffeine acts on neither directly — it blocks the receptors that report the pressure. The pressure keeps building behind the block, which is why the crash arrives and why an afternoon dose costs that night's sleep even when you do not feel it.ExplainerHow Long Until You Are Sober? Zero-Order Elimination ExplainedAlcohol leaves the body at a roughly constant mass per hour, whatever the concentration. That one property — zero-order elimination, unlike caffeine's exponential decay — explains why doubling the dose doubles the time, why nothing speeds it up, and why every estimate carries a wide error bar. With the Widmark relation worked through, and each market's legal limit stated separately.ExplainerNap Length Decides What You Get — Not How Tired You WereA nap's effect depends on which sleep stage the alarm interrupts, and length is the only part of that you control. What 10, 20, 30 and 90 minutes actually do, with the arithmetic for the alarm.How-toHow to Calculate Molar Mass, Including Parentheses and HydratesMultiply each atomic weight by its subscript and add. The only three places the arithmetic goes wrong are a subscript after a closing bracket, the hydrate dot, and a capital letter typed as a lowercase one.