How this calculator works
Find your five heart-rate training zones from your age or max heart rate. Values are processed instantly on this device, with checks for missing values and invalid divisions.
Max Hr: 220 - age | Zones: percent bands of max HR (50–100%)
Worked example
Enter realistic values in each labeled field, select Calculate, and review both the primary answer and supporting details. Use Reset to clear the form before trying another scenario.
Frequently asked questions
What does the Heart Rate Zone Calculator do?
Find your five heart-rate training zones from your age or max heart rate.
Are my values stored?
No. The calculation runs locally in your browser and the values are not submitted to us.
Can I rely on this result?
Use this as an informational estimate. Health decisions should be discussed with a qualified professional.
Important: This is general educational information, not medical advice.