Heart Rate Training Zones
Calculate your 5 heart-rate training zones (recovery, endurance, tempo, threshold, VO₂) using the Karvonen method.
Karvonen method
Maximum HR is estimated as 220 − age. Heart Rate Reserve (HRR) = HRmax − HRrest. Each zone target = HRrest + (HRR × intensity %).
Frequently Asked Questions
Is the Heart Rate Training Zones free to use?
Yes, the Heart Rate Training Zones is 100% free to use. There are no subscriptions, no sign-ups, and no hidden fees.
Is my data safe when using the Heart Rate Training Zones?
Absolutely. All calculations performed by the Heart Rate Training Zones happen locally in your web browser. We do not store, track, or transmit your inputs or results to any server.
How accurate is the Heart Rate Training Zones?
Our Heart Rate Training Zones uses industry-standard formulas and methodology. You can view the exact formula and calculation logic used in the methodology section above to verify the math yourself.
Can I use the Heart Rate Training Zones on my mobile phone?
Yes! The Heart Rate Training Zones is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.