Target Heart Rate Calculator

Estimate target heart rate zones based on age.

Privacy: All calculations will run locally in your browser. We do not send your inputs to any server.
Tip: your entries are never placed in the page URL.
If you have a tested max HR, it is usually more accurate.
If provided, zones can use Heart Rate Reserve (Karvonen) for a more personalized range.
Used only when you estimate max HR from age.
Zones show five ranges (50–100%). Borg/CR10 output a single target HR from perceived exertion.

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About Target Heart Rate

This page is a placeholder. Next, we’ll add the full set of inputs, formulas, and guidance—written in plain English.

How it will work

As you enter values, results will be calculated in your browser (no server calls). You’ll be able to export a summary and (optionally) store results locally as history.