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Half-Life Decay & Remaining Quantity Calculator

Calculate exponential radioactive decay and chemical half-life curves.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Formula: N(t) = N₀ * (1/2)^(t / t½). Governs radioactive isotopes, carbon dating, and pharmaceutical drug elimination.

How to use it (step by step)

  1. 1Fill in the boxes: “Initial Quantity (N₀)”, “Half-Life Period (same time unit)”, “Elapsed Time”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

No special words here. Just follow the steps. If anything is unclear, email [email protected] and we will explain it better.

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