Tools / Heart rate zone calculator
Heart rate zone calculator
Enter your age and, if you know it, your resting heart rate (measured in the morning before getting up).
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Enter your age.
- Optionally add your resting heart rate.
- Train in the zone that fits your goal.
Your inputs live only in the link, not on our server.
Last checked: October 2026 · Based on: Fox formula, Tanaka et al. 2001, Karvonen method. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
What is a good training heart rate for fat burning?
Zone 2, about 60–70 % of your maximum, is often recommended for long, easy endurance training.
How do I measure my resting heart rate?
In the morning after waking up, lying down, count the beats for 60 seconds.