yrs
Enter your age (10–100).
Used to estimate maximum heart rate
BPM
Measure first thing in the morning. Enables Karvonen formula for more accurate zones.
Tanaka formula is more accurate for adults over 40
Maximum Heart Rate
—
Your 5 Heart Rate Training Zones
⚠️ Medical Disclaimer: Heart rate zone calculations are estimates based on population averages. Consult a physician before starting a new exercise program, especially if you have heart conditions, high blood pressure, or other health concerns. Stop exercising and seek medical attention if you experience chest pain, dizziness, or shortness of breath.
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Sources & Methodology
Heart rate zone formulas verified against American Heart Association, ACSM, and peer-reviewed exercise physiology research.
American Heart Association — Target Heart Rates
Primary source for target heart rate guidelines and the 220-minus-age maximum heart rate formula
ACSM — Physical Activity Guidelines
American College of Sports Medicine guidelines for exercise intensity, heart rate zones, and training recommendations
Tanaka et al. — Age-Predicted Maximal Heart Rate (JACC, 2001)
Peer-reviewed study validating the Tanaka formula: 208 − (0.7 × age) as a more accurate MHR estimate for older adults
Methodology: Maximum heart rate (MHR) is estimated using either 220−age (standard) or 208−(0.7×age) (Tanaka formula). Standard zone percentages: Zone 1: 50–60% MHR, Zone 2: 60–70% MHR, Zone 3: 70–80% MHR, Zone 4: 80–90% MHR, Zone 5: 90–100% MHR. When resting heart rate (RHR) is provided, the Karvonen formula is used: Target HR = RHR + (intensity% × (MHR − RHR)), which personalizes zones for individual fitness level.
⏱ Last reviewed: April 2026
Heart Rate Training Zones Explained — 2026 Guide
Heart rate training zones divide the range from resting heart rate to maximum heart rate into bands, each representing a different exercise intensity and physiological stimulus. Training in specific zones targets different energy systems, fitness adaptations, and health outcomes. Understanding your zones allows you to train smarter — not just harder — for your specific goals.
How to Calculate Maximum Heart Rate
Max HR (Standard) = 220 − Age
Example, age 35: 220 − 35 = 185 BPM. Simple and widely used, but tends to overestimate for older adults.
Max HR (Tanaka) = 208 − (0.7 × Age)
Example, age 35: 208 − (0.7 × 35) = 208 − 24.5 = 183.5 BPM. More accurate for adults over 40, validated by large peer-reviewed study.
Karvonen Formula: THR = RHR + (Intensity% × (Max HR − RHR))
Example, age 35, RHR 60, Zone 2 lower limit (60%): 60 + (0.60 × (185 − 60)) = 60 + (0.60 × 125) = 60 + 75 = 135 BPM. The Karvonen formula accounts for individual fitness level via resting heart rate, giving more personalized zones.
The 5 Heart Rate Training Zones
| Zone | % Max HR | Name | Feel | Primary Benefit |
|---|---|---|---|---|
| Zone 1 | 50–60% | Very Light | Easy, can sing | Warm-up, recovery, active rest |
| Zone 2 | 60–70% | Light / Fat Burn | Comfortable, talking easily | Fat oxidation, aerobic base, mitochondria |
| Zone 3 | 70–80% | Moderate / Aerobic | Somewhat hard, short sentences | Aerobic fitness, endurance, tempo |
| Zone 4 | 80–90% | Hard / Threshold | Hard, few words, breathing heavy | Lactate threshold, performance, speed |
| Zone 5 | 90–100% | Maximum | Maximum effort, unsustainable | Anaerobic power, VO2 max, sprinting |
How Long to Spend in Each Zone
The optimal training distribution depends on your goals. For general cardiovascular health, the American Heart Association recommends at least 150 minutes per week of moderate-intensity exercise (Zone 2–3) or 75 minutes of vigorous exercise (Zone 4–5). For endurance athletes and those focused on longevity, research increasingly supports the 80/20 polarized training approach: approximately 80% of training volume in Zones 1–2 and 20% in Zones 4–5, with minimal time in Zone 3.
Why Zone 2 Gets Special Attention
Zone 2 training (60–70% max HR) has received significant attention in sports science and longevity research. At this intensity, the body primarily uses fat as fuel, which trains the mitochondria — the cells' energy powerhouses — to become more numerous and efficient. This adaptation improves endurance, fat-burning efficiency, and metabolic health. Researchers and longevity physicians including Dr. Peter Attia recommend 3–4 hours of Zone 2 cardio per week for optimum long-term health outcomes.
💡 Practical Tip: You are in Zone 2 if you can maintain a conversation but feel moderate effort — this is sometimes called the "talk test." If you can sing, you are in Zone 1. If you can only say a few words between breaths, you are in Zone 3 or higher.
Heart Rate Zones by Age — Quick Reference (220−Age Formula)
| Age | Max HR | Zone 1 (50–60%) | Zone 2 (60–70%) | Zone 3 (70–80%) | Zone 4 (80–90%) |
|---|---|---|---|---|---|
| 20 | 200 | 100–120 | 120–140 | 140–160 | 160–180 |
| 30 | 190 | 95–114 | 114–133 | 133–152 | 152–171 |
| 40 | 180 | 90–108 | 108–126 | 126–144 | 144–162 |
| 50 | 170 | 85–102 | 102–119 | 119–136 | 136–153 |
| 60 | 160 | 80–96 | 96–112 | 112–128 | 128–144 |
Frequently Asked Questions
Target heart rate is the heart rate range you aim to reach during exercise to achieve a specific fitness goal. It is expressed as a percentage of your maximum heart rate. Different target zones correspond to different workout intensities and benefits — from gentle fat burning at low intensity to peak cardiovascular effort at high intensity.
The standard formula is 220 minus your age. For example, a 35-year-old has an estimated max HR of 185 BPM. The more accurate Tanaka formula is 208 minus (0.7 times age). Both are estimates — actual max heart rate varies significantly by individual. The Tanaka formula is preferred for adults over 40.
Zone 1 (50–60%): Very light — warm-up and recovery. Zone 2 (60–70%): Light — fat burning and aerobic base. Zone 3 (70–80%): Moderate — aerobic fitness and endurance. Zone 4 (80–90%): Hard — lactate threshold and performance. Zone 5 (90–100%): Maximum — anaerobic power and speed. Each zone targets different energy systems and adaptations.
Zone 2 (60–70% of max HR) is called the fat burning zone because fat provides a higher percentage of energy at this intensity. However, higher intensity zones burn more total calories per minute even if the fat percentage is lower. For overall fat loss, Zone 2 steady-state cardio combined with higher-intensity interval training is most effective.
The Karvonen formula uses heart rate reserve (max HR minus resting HR) to calculate personalized zones. Target HR = Resting HR + (intensity% × Heart Rate Reserve). For max HR 185 and resting HR 60, Zone 2 lower limit = 60 + (0.60 × 125) = 135 BPM. This gives more accurate zones than the percentage-only method.
A normal resting heart rate for adults is 60 to 100 BPM. Well-trained athletes often have resting heart rates of 40 to 60 BPM due to cardiac efficiency. Measure your resting heart rate first thing in the morning before getting out of bed for the most accurate reading. A resting HR consistently above 100 BPM warrants medical evaluation.
You can measure exercise heart rate using a chest-strap HR monitor (most accurate), a smartwatch or fitness tracker with optical sensor (slightly less accurate at high intensity), or manually — press two fingers to your neck or wrist, count beats for 15 seconds, then multiply by 4. Chest straps are preferred for serious training because optical sensors can be inaccurate during vigorous exercise.
Zone 2 training is steady-state cardio at 60–70% of max HR where you can hold a conversation. It builds aerobic base, improves mitochondrial density, enhances fat oxidation, and promotes recovery. Longevity researchers and endurance coaches increasingly recommend 3–4 hours of Zone 2 per week as the foundation of cardiovascular fitness and long-term health.
Heart rate zone training provides objective data that removes guesswork. Training by feel (rate of perceived exertion) is affected by fatigue, heat, hydration, and daily stress, leading to inconsistent intensity. Combining both methods is ideal — use heart rate zones to set intensity boundaries and perceived exertion as a cross-check. The "talk test" aligns well with Zone 2 boundaries.
VO2 max is the maximum rate at which your body consumes oxygen during intense exercise — the gold standard of aerobic fitness. Zone 5 training at 90–100% max HR is approximately equivalent to VO2 max intensity. Higher VO2 max means you can work at greater absolute intensity while maintaining the same percentage heart rate zone — elite runners run faster than most people in Zone 2.
Research supports the 80/20 polarized approach: about 80% of training volume in Zones 1–2 and 20% in Zones 4–5. This is more effective than spending most time in Zone 3. The AHA recommends 150 minutes per week of moderate-intensity exercise or 75 minutes of vigorous exercise for general health. Beginners should start predominantly in Zones 1–2 before adding higher intensity sessions.
Yes. Maximum heart rate naturally declines approximately 1 BPM per year, which is why the formula is 220 minus age. A 20-year-old has an estimated max HR of 200 BPM while a 60-year-old has an estimated max of 160 BPM. Absolute BPM targets for each training zone decrease with age, but the percentage-based zones remain the same, meaning the effort level stays similar.
Yes. Heart rate zones apply to all cardiovascular exercise including cycling, swimming, rowing, and elliptical training. However, max heart rate can vary slightly by exercise type — running typically produces the highest max HR because it involves more muscle mass. Your functional max HR for cycling or elliptical may be 5–10 BPM lower than your running max HR.
Heart rate drift (cardiac drift) is the gradual increase in heart rate during prolonged exercise even at constant intensity. It is caused by dehydration, heat, and fatigue. During long workouts you may need to reduce pace to stay in your target zone. Staying well hydrated and training in cooler conditions minimizes cardiac drift and helps you maintain accurate zone-based training.
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