Heart Rate & Training Zone Calculator
Calculate your Maximum Heart Rate (MHR) and Target Zones using the Karvonen Formula.
Understanding Your Heart Rate Metrics
Knowing your Maximum Heart Rate (MHR) and Resting Heart Rate (RHR) is crucial for designing an effective cardiovascular training program. While simple formulas like 220 minus age provide a rough estimate, incorporating your resting heart rate allows for the Karvonen Formula, which is far more personalized and accurate for athletes and fitness enthusiasts.
What is Heart Rate Reserve (HRR)?
Heart Rate Reserve is the difference between your predicted maximum heart rate and your resting heart rate. It represents the actual range of heart beats available for exertion. The higher your fitness level, the lower your resting heart rate usually is, which increases your HRR and your capacity for physical work.
The Karvonen Formula Explained
The Karvonen formula calculates target heart rate (THR) by using a percentage of your heart rate reserve added back to your resting heart rate:
Target HR = ((MHR – RHR) × %Intensity) + RHR
Training Intensity Zones
| Zone | Intensity | Benefit |
|---|---|---|
| Zone 1: Warm Up | 50% – 60% | Weight management and recovery. |
| Zone 2: Fat Burn | 60% – 70% | Improves basic endurance and fat metabolism. |
| Zone 3: Aerobic | 70% – 80% | Improves cardiovascular fitness and aerobic capacity. |
| Zone 4: Anaerobic | 80% – 90% | Increases lactic acid tolerance and speed. |
| Zone 5: Red Line | 90% – 100% | Maximum performance and sprinting (short intervals). |
Real-World Example
Consider a 40-year-old individual with a Resting Heart Rate of 60 BPM:
- Max HR: 220 – 40 = 180 BPM
- HRR: 180 – 60 = 120 BPM
- 70% Intensity Calculation: (120 × 0.70) + 60 = 144 BPM
Using this method, this individual should aim for approximately 144 beats per minute to stay in their aerobic training zone.