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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.

Max Heart Rate

If you have a tested max HR, it is usually more accurate.

Age

Resting Heart Rate (optional)

If provided, zones can use Heart Rate Reserve (Karvonen) for a more personalized range.

Max heart rate estimation formula (age mode)

Used only when you estimate max HR from age.

Activity intensity scale

Zones show five ranges (50–100%). Borg/CR10 output a single target HR from perceived exertion.

Borg scale value (6–20)

Requires Resting HR.

Borg CR10 value (0–10)

Requires Resting HR.

Copied

Export summary will download a .txt file created in your browser. Copy page link copies only the page address (no inputs).

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.