How it works
Training in the right heart-rate zone makes every workout count. Zone 2 (60–70% of max) builds your aerobic base and burns fat; zones 4–5 improve speed and fitness. Adding your resting heart rate gives more personal zones (Karvonen method).
Frequently asked questions
How do I find my resting heart rate?
Count your pulse for 60 seconds right after waking up, before getting out of bed.
These calculators give estimates for general guidance only and are not medical advice. Please consult a doctor for health concerns.