How to Use This Heart Rate Zone Calculator
Enter your age and resting heart rate to calculate your five training zones. Choose between the simple percentage of max heart rate method or the more accurate Karvonen method, which factors in your resting heart rate. You can also enter your current heart rate to see which zone you're in during a workout.
Understanding the Training Zones
Zone 1 (Recovery): Light activity like walking. Ideal for warm-ups, cool-downs, and active recovery days. Builds a strong aerobic foundation.
Zone 2 (Endurance): Comfortable conversational pace. This is where most of your training should occur. Improves fat metabolism and builds base endurance.
Zone 3 (Aerobic): Moderate effort where breathing becomes heavier. Improves cardiovascular efficiency and aerobic capacity.
Zone 4 (Threshold): Hard effort near your lactate threshold. Improves speed endurance and race performance. Sustainable for 20-40 minutes.
Zone 5 (VO2 Max): All-out effort for short intervals only. Builds maximum power and speed. Used in sprint training and high-intensity interval workouts.
Percentage vs Karvonen Method
The percentage method simply calculates zones as a percentage of your estimated max heart rate (220 minus age). The Karvonen method uses your heart rate reserve (max HR minus resting HR) for more personalized zones. Athletes with lower resting heart rates will see a noticeable difference between the two methods. The Karvonen method is generally considered more accurate for trained individuals.
How to Measure Resting Heart Rate
Measure your resting heart rate first thing in the morning before getting out of bed. Count your pulse for 60 seconds, or count for 15 seconds and multiply by 4. Average several mornings for the most accurate reading. A typical resting heart rate for adults is 60-100 bpm, while trained athletes may be as low as 40 bpm.