Heart Rate Zones Calculator
Five training zones — recovery, endurance, tempo, threshold and max — based on your max heart rate.
Scan to open on your phone
Point your phone camera at the code to open this tool.
Five training zones — recovery, endurance, tempo, threshold and max — based on your max heart rate.
How to use Heart Rate Zones Calculator
- Open the toolNo signup and nothing to install; it works as soon as the page loads.
- Set “Age”
- Read the resultChange any input and the result is recalculated immediately.
Worked example with the defaults
- FAT-BURN ZONE (60–70%)
- 112–131
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
Heart Rate Zones Calculator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- What is zone 2?
- Zone 2 is 60-70% of max heart rate — the easy endurance zone where you can still hold a conversation. Long runs there build aerobic base.