Heart Rate Zone Calculator
Calculate your 5 training zones using the Karvonen method or max HR percentage. Customize with your age and resting heart rate.
Your data
Measure upon waking, lying down
Heart Rate Zone Calculator: Optimize Your Training
Why Calculate Your Heart Rate Zones?
Knowing your heart rate zones lets you tailor the intensity of every workout to your goals: weight loss, endurance, performance, or recovery.
Zone-based training reduces the risk of overtraining and injury by helping you respect your body's physiological limits.
The Karvonen method, built into this tool, factors in your resting heart rate to deliver more accurate and personalized ranges than a simple max HR percentage.
Common Use Cases
- Marathon and Half-Marathon Preparation
- Determine your base endurance pace (zone 2) for long runs and your threshold pace (zone 4) for distance-specific interval sessions.
- Weight Loss and Fat Burning
- Identify the optimal heart rate range (zones 1-2) where your body primarily burns fat as fuel during cardio sessions.
- Cycling and Triathlon Training
- Calibrate your rides and transitions by knowing your exact effort zones to manage energy across long, multi-discipline events.
- Fitness Tracking Over Time
- Track how your zones evolve by regularly measuring your resting HR. A decreasing resting HR indicates improved cardiovascular fitness.
How to Use the Heart Rate Zone Calculator
Enter your age to estimate your maximum heart rate using the Fox formula (220 − age). If you know your true max HR from a stress test, the results will be even more accurate.
Enter your resting heart rate (measured in the morning upon waking, lying down, over 3 consecutive days) to activate the Karvonen method, which is more reliable than the simple percentage.
View your 5 personalized training zones with BPM ranges. Use these values to set zone alerts on your watch or heart rate monitor.
Frequently Asked Questions About Heart Rate Zones
- What is the difference between the Karvonen method and simple max HR percentage?
- The Karvonen method uses heart rate reserve (max HR − resting HR) to calculate zones, providing more personalized results. The simple percentage is based solely on estimated max HR, which is less accurate because it does not account for your baseline fitness level.
- How do I accurately measure my resting heart rate?
- Measure your resting HR in the morning upon waking, while still lying in bed, before getting up. Use a heart rate monitor or take your pulse at the wrist for 60 seconds. Repeat over 3 to 5 days and average the results for a reliable figure.
- Is the 220 − age formula reliable for estimating max HR?
- The Fox formula (220 − age) provides an acceptable estimate for most adults, but it can vary by ±10 to 15 bpm between individuals. For a precise value, a supervised maximal exercise test by a healthcare professional remains the gold standard.
- Can I use these zones for all sports?
- Heart rate zones apply to any endurance activity: running, cycling, swimming, rowing, hiking, or brisk walking. However, sports with frequent pauses or technical components (tennis, weight training) are less suited to zone-based monitoring.
- Do my zones change as my fitness improves?
- Your max HR changes little (it decreases slightly with age), but your resting HR can drop significantly with training. By regularly recalculating your zones with the Karvonen method and an updated resting HR, your training ranges will always stay optimal.