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Free Heart Rate Zones Online
Free Heart Rate Zones Online is a free online tool by US AI. Training pulse zones. It runs completely in your browser — no signup, no download, works on mobile and desktop.
📖 How to use
- Open the tool with the button above — it loads instantly.
- Enter your age and press Show Zones — your estimated max heart rate (about 220 minus age) and five training zones (Recovery, Fat burn, Aerobic, Threshold, Max) appear instantly.
- Your data stays on this device — nothing is uploaded or shared. Max heart rate is an estimate — consult a doctor before intense training.
✨ Why use this tool?
US AI's free heart rate zones online is fast, private and 100% free forever. Bookmark this page and share it with anyone who needs it.