Heart Rate Zone Calculator
Calculate your 5 target heart rate zones for optimal training.
Updated April 2026 · CalcFlow Editorial
Enter values above and click Calculate to see your results.
How to Use
- Enter your age.
- Enter your resting heart rate (measure in the morning before getting up).
- Click Calculate to see all 5 zones.
Formula
Max HR = 220 - Age | Karvonen Zone = Resting HR + (Max HR - Resting HR) x Zone %