Target Heart Rate Zone Calculator
Determine your personal training intensities using the Karvonen Formula.
Your Personalized Training Zones
Max Heart Rate: BPM
Heart Rate Reserve (HRR): BPM
| Zone | Intensity | Range (BPM) | Benefit |
|---|---|---|---|
| Zone 1 | 50% – 60% | Warm-up / Recovery | |
| Zone 2 | 60% – 70% | Fat Burning / Endurance | |
| Zone 3 | 70% – 80% | Aerobic / Fitness | |
| Zone 4 | 80% – 90% | Anaerobic / Performance | |
| Zone 5 | 90% – 100% | Max Effort / Speed |
Understanding Target Heart Rate Zones
Calculating your target heart rate (THR) training zones is essential for optimizing your cardiovascular workouts. Whether your goal is weight loss, endurance building, or improving athletic performance, training at the right intensity ensures you aren't overexerting yourself or, conversely, not working hard enough to see results.
The Karvonen Formula Explained
This calculator utilizes the Karvonen Formula, which is widely considered more accurate than the standard "220 minus age" method because it takes your Resting Heart Rate (RHR) into account. By factoring in your fitness level (represented by your RHR), it creates a more personalized intensity scale.
The Formula:
1. Max HR = 220 – Age
2. Heart Rate Reserve (HRR) = Max HR – Resting HR
3. Target HR = (HRR × Intensity%) + Resting HR
1. Max HR = 220 – Age
2. Heart Rate Reserve (HRR) = Max HR – Resting HR
3. Target HR = (HRR × Intensity%) + Resting HR
What do the Heart Rate Zones mean?
- Zone 1 (Very Light): Ideal for active recovery and warming up. It improves overall health but doesn't significantly boost fitness.
- Zone 2 (Light): The "Fat Burning Zone." This intensity builds basic endurance and allows the body to become more efficient at utilizing fat for fuel.
- Zone 3 (Moderate): The Aerobic Zone. This improves your cardiovascular system and lung capacity. It is the sweet spot for most fitness enthusiasts.
- Zone 4 (Hard): The Anaerobic Zone. This increases your lactate threshold. You'll be breathing hard and unable to maintain a conversation.
- Zone 5 (Maximum): All-out effort. This is usually reserved for short interval training (HIIT) to improve peak speed and power.
Example Calculation
If you are 40 years old with a resting heart rate of 70 BPM:
- Max HR: 220 – 40 = 180 BPM
- HRR: 180 – 70 = 110 BPM
- Zone 2 (60% Lower Limit): (110 × 0.60) + 70 = 136 BPM
- Zone 2 (70% Upper Limit): (110 × 0.70) + 70 = 147 BPM
To stay in Zone 2, this individual should keep their heart rate between 136 and 147 beats per minute.