半減期計算機

共有リンク

はじめに

Half-Life Calculator — Half-life of any exponential decay. Enter Initial amount N₀, Remaining amount Nₜ, Elapsed time to get an instant, accurate result.

計算式

t½ = t × ln(2) / ln(N₀/Nₜ), derived from the exponential decay equation.

ステップごとの説明

Enter the Initial amount N₀.
Enter the Remaining amount Nₜ.
Enter the Elapsed time.
Click Calculate to see your result instantly.

実例

Example: With Initial amount N₀ = 100, Remaining amount Nₜ = 25, Elapsed time = 10, the Half-Life Calculator gives Half Life: 5.

よくある質問

What does half-life mean?

The time it takes for a quantity to reduce to half its original amount, common in radioactive decay and pharmacokinetics.

Does half-life depend on the starting amount?

No — half-life is constant for a given substance regardless of the starting quantity.

What inputs does the Half-Life Calculator need?

You'll need to provide: Initial amount N₀, Remaining amount Nₜ, Elapsed time. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Half-Life Calculator?

The Half-Life Calculator applies the formula exactly as calculated — t½ = t × ln(2) / ln(N₀/Nₜ), derived from the exponential decay equation. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Half-Life Calculator free to use?

Yes, the Half-Life Calculator is completely free, requires no signup, and runs instantly in your browser.