NUMORA originals · NUMORA
Caffeine Calculator
How much of that cup is still aboard at bedtime.
Open interactive calculatorHow to use
Adult half-life ≈ 5h (highly individual).
Formula
A = A0 × (1/2)^{t/h}
FAQ
Is this Caffeine calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
Adult half-life ≈ 5h (highly individual).
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