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Target Heart Rate Calculator

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

Training heart-rate zones from your age and resting heart rate, by the Karvonen method.

How it works: max heart rate falls with age — Tanaka estimates it as 208 − 0.7 × age. Add your resting rate and the zones use the Karvonen method, which applies each intensity to your heart-rate reserve (max minus resting) instead of raw percentages.
Enter your age; add your resting rate for Karvonen zones.

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How to Use Target Heart Rate 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 Target Heart Rate Calculator completely free to use?

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

Are my files safe and private?

Yes. Target Heart Rate 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 Target Heart Rate Calculator on mobile phones and tablets?

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