Calculate your 5 heart rate training zones instantly. Get your maximum heart rate from 4 scientific formulas and personalized zones using the Karvonen method.
Enter your age to get started. Add resting heart rate for more accurate zones.
Heart rate training zones are specific ranges of heart rate intensity, typically expressed as a percentage of your maximum heart rate (MHR). They divide the full spectrum of exercise intensity into 5 distinct zones, each targeting different energy systems and producing different physiological adaptations.
Training in the right zone helps you achieve specific fitness goals more efficiently. Whether you are trying to burn fat, build endurance, increase speed, or improve your VO2 max, understanding which zone you are in ensures you train at the right intensity for the desired outcome.
| Zone | Name | Intensity | What It Trains | Example Activities |
|---|---|---|---|---|
| 1 | Recovery | 50-60% | Active recovery, warm-up, improved blood flow | Easy walking, gentle cycling, stretching |
| 2 | Fat Burn / Endurance | 60-70% | Aerobic base, fat oxidation, mitochondrial density | Brisk walking, easy jogging, light cycling |
| 3 | Aerobic | 70-80% | Cardiovascular efficiency, stamina, lactate clearance | Running, cycling, swimming at moderate effort |
| 4 | Anaerobic / Threshold | 80-90% | Lactate threshold, speed endurance, anaerobic capacity | Tempo runs, hill repeats, race-pace intervals |
| 5 | VO2 Max | 90-100% | Maximum oxygen uptake, neuromuscular power, peak speed | All-out sprints, short intervals, competitive racing |
Your maximum heart rate (MHR) is the highest number of beats per minute your heart can achieve during maximal exertion. It is genetically determined and decreases with age. There are several ways to estimate or measure it:
Our calculator uses four scientifically validated formulas to estimate your max HR:
For the most accurate result, a graded exercise test (GXT) performed by a medical professional measures your actual max HR. This involves progressively increasing exercise intensity on a treadmill or cycle ergometer while monitoring your heart rate until you reach true maximal effort.
The Karvonen method, also known as the Heart Rate Reserve (HRR) method, is a more personalized way to calculate training zones. Developed by Finnish physiologist M.J. Karvonen in 1957, it accounts for your individual fitness level by incorporating your resting heart rate.
A fit person with a resting heart rate of 50 bpm and an unfit person with a resting heart rate of 80 bpm have very different effective training ranges, even at the same age. The standard percentage-of-max-HR method ignores this difference. The Karvonen method accounts for it by using the heart rate reserve, the difference between your maximum and resting heart rates.
For a 30-year-old with a resting HR of 60 bpm:
Notice how the Karvonen method produces higher zone values that better reflect this person's actual training capacity.
Zone 2 training (60-70% of max HR) has gained significant attention from endurance coaches, exercise physiologists, and longevity researchers. It is the intensity at which your body maximally relies on fat as a fuel source while still being comfortable enough to sustain for long periods.
Besides monitoring your heart rate, the "talk test" is a simple way to gauge Zone 2 intensity: you should be able to carry on a conversation but might find it slightly challenging. If you can sing, you are too easy. If you can only say a few words at a time, you have crossed into Zone 3.
The "fat burning zone" label on cardio machines suggests that exercising at a lower intensity (Zone 2) is the best way to lose fat. This is one of the most persistent myths in fitness, and the truth is more nuanced.
Both Zone 2 and higher-intensity training have their place. Zone 2 is excellent for building an aerobic base, improving metabolic health, and enabling higher training volumes. Higher-intensity work is time-efficient and produces strong cardiovascular adaptations. The best approach for most people is a mix of both, with the majority of volume in Zone 2.
Your resting heart rate (RHR) is a valuable indicator of cardiovascular fitness and overall health. A lower resting heart rate generally indicates a more efficient heart and better aerobic fitness.
| Category | Resting HR (bpm) |
|---|---|
| Elite Athlete | 40-50 |
| Well-Trained | 50-60 |
| Active / Fit | 60-70 |
| Average Adult | 70-80 |
| Below Average | 80-90 |
| Poor / Sedentary | 90-100+ |
This heart rate zone calculator is provided for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. The heart rate zones calculated are estimates based on population-average formulas and may not accurately reflect your individual physiology.
Before starting any new exercise program or significantly increasing your exercise intensity, consult with a qualified healthcare provider, especially if you have a heart condition, high blood pressure, are taking medications that affect heart rate (such as beta-blockers), are over 40 and have been sedentary, or have any other health concerns. If you experience chest pain, dizziness, or unusual symptoms during exercise, stop immediately and seek medical attention.
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