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Half-Life Calculator

Files stay on your device · 100% private Runs in your browser

Exponential decay by half-life: remaining amount, elapsed time, or number of half-lives.

How it works: after every half-life, half of what remains decays: N = N₀ × (1/2)t/T. Fill any two of initial amount, elapsed time, and half-life — the third is solved. Units are yours to choose as long as they match.
Fill the known quantities.

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How to Use Half-Life Calculator

1

Select or Upload

Choose your file or paste your input into the workspace above. Drag and drop is supported.

2

Configure & Process

Adjust options to fit your task. Processing runs immediately with no waiting queue.

3

Download Result

Preview and save your output in one click with no watermarks or sign-up prompts.

Private & Confidential

Browser tools process files locally on your device, and server temporary files are deleted automatically within 15 minutes.

Free & No Registration

Full access to every utility without creating an account, signing in, or hitting paywalls.

Works on Any Device

Responsive layout that runs smoothly on desktop, tablet, and mobile browsers across all operating systems.

Frequently Asked Questions

Is Half-Life Calculator completely free to use?

Yes, Half-Life Calculator on KiloToolbox is 100% free with no limits, hidden fees, or account sign-up required.

Are my files safe and private?

Yes. Half-Life Calculator processes all files directly inside your web browser using client-side JavaScript and WebAssembly. Your files never leave your computer or mobile device and are never uploaded to any remote server.

Can I use Half-Life Calculator on mobile phones and tablets?

Yes, KiloToolbox is fully responsive and runs smoothly on iPhone, Android, iPad, Mac, Windows, and Linux.