Heart Rate Zones for a Fit 25-Year-Old Athlete

A 25-year-old athlete with a low resting HR of 50 bpm has high cardiac efficiency and wide zone spreads.

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How to use this tool

Enter age and resting heart rate in the fields above.
Results update instantly as you type — or click Calculate.
Read your estimated max hr and the full breakdown beneath it.

See the heart rate training zones for a young, well-conditioned 25-year-old athlete.

Frequently asked questions

What is the Karvonen method?: It calculates training zones as a percentage of heart-rate reserve (max HR − resting HR), then adds resting HR. This personalises zones better than using max HR alone.
How do I find my resting heart rate?: Measure your pulse first thing in the morning before getting up, ideally on several days and average the results.