Heart Rate Zone Reference
| Zone | Intensity | % of Max HR | Primary Benefit |
|---|---|---|---|
| Zone 1 | Very Light | 50 – 60% | Recovery, warm-up |
| Zone 2 | Light | 60 – 70% | Fat burning, endurance |
| Zone 3 | Moderate | 70 – 80% | Aerobic fitness |
| Zone 4 | Hard | 80 – 90% | Anaerobic threshold |
| Zone 5 | Maximum | 90 – 100% | VO2 max, peak power |
Maximum Heart Rate by Age
Estimated max heart rate using the 220 − age formula. Individual results vary by ±10–12 bpm.
| Age | Max HR (bpm) | Zone 2 Range | Zone 4 Range |
|---|---|---|---|
| 20 | 200 | 120 – 140 | 160 – 180 |
| 25 | 195 | 117 – 137 | 156 – 176 |
| 30 | 190 | 114 – 133 | 152 – 171 |
| 35 | 185 | 111 – 130 | 148 – 167 |
| 40 | 180 | 108 – 126 | 144 – 162 |
| 45 | 175 | 105 – 123 | 140 – 158 |
| 50 | 170 | 102 – 119 | 136 – 153 |
| 55 | 165 | 99 – 116 | 132 – 149 |
| 60 | 160 | 96 – 112 | 128 – 144 |
| 65 | 155 | 93 – 109 | 124 – 140 |
| 70 | 150 | 90 – 105 | 120 – 135 |
Understanding Heart Rate Zones
Heart rate zones are specific ranges of heartbeats per minute that correspond to different levels of exercise intensity. By training in the right zone, you can target specific fitness goals — whether that's burning fat, building aerobic endurance, or pushing your anaerobic limits. Heart rate zone training is used by everyone from casual joggers to elite athletes to optimize their workouts and avoid overtraining.
Your target heart rate zones are calculated from your maximum heart rate (max HR), which represents the fastest your heart can beat during all-out exertion. The standard estimate is 220 minus your age, though individual variation means your actual max HR could be 10–12 bpm higher or lower.
The 5 Heart Rate Training Zones
Zone 1: Warm-Up (50–60% Max HR)
Zone 1 is the lightest intensity. Your breathing is easy and conversational. This zone is ideal for warm-ups, cool-downs, and active recovery between hard training days. It promotes blood flow to muscles without adding training stress. Example activities: easy walking, gentle stretching, light yoga.
Zone 2: Fat Burning (60–70% Max HR)
Zone 2 is where your body primarily burns fat for fuel. At this comfortable, sustainable pace, you can exercise for extended periods. This zone builds your aerobic base — the foundation of all endurance fitness. Most of your weekly training time should be spent here. Example activities: brisk walking, easy jogging, casual cycling, swimming at a relaxed pace.
Zone 3: Aerobic (70–80% Max HR)
Zone 3 improves cardiovascular efficiency and aerobic capacity. Breathing becomes heavier but still manageable. You can speak in short sentences but not hold a full conversation. This zone strengthens your heart muscle and improves your body's ability to transport and use oxygen. Example activities: steady-state running, moderate cycling, rowing, group fitness classes.
Zone 4: Anaerobic (80–90% Max HR)
Zone 4 pushes you past your anaerobic threshold — the point where your body can no longer clear lactic acid as fast as it produces it. Training here improves your lactate threshold, speed, and power. You can only sustain this effort for 10–30 minutes. Example activities: tempo runs, hill repeats, interval training, competitive cycling.
Zone 5: VO2 Max (90–100% Max HR)
Zone 5 is maximum effort. Your heart and lungs are working at full capacity. Training here improves your VO2 max — the maximum amount of oxygen your body can use during exercise. This zone can only be sustained for short bursts of 1–5 minutes. Example activities: all-out sprints, high-intensity intervals, race finishes, Tabata-style workouts.
Standard Method vs. Karvonen Method
There are two main approaches to calculating your heart rate zones:
- Standard method (% of Max HR): Simply multiplies your max heart rate by the zone percentages. Quick and easy, but doesn't account for individual fitness levels.
- Karvonen method (Heart Rate Reserve): Uses both your max HR and resting HR to calculate zones. The formula is: Target HR = ((Max HR − Resting HR) × intensity%) + Resting HR. This method produces more personalized zones because a lower resting heart rate (indicating better fitness) shifts your zones higher.
The Karvonen method is generally considered more accurate for trained individuals. If you know your resting heart rate, toggle to the Karvonen method above for more personalized results.
How to Measure Your Resting Heart Rate
For the most accurate resting heart rate measurement:
- Measure first thing in the morning before getting out of bed
- Place two fingers on your wrist (radial pulse) or neck (carotid pulse)
- Count beats for 60 seconds, or count for 15 seconds and multiply by 4
- Measure on 3 consecutive mornings and take the average
- Avoid measuring after caffeine, alcohol, or a stressful night's sleep
Tips for Heart Rate Zone Training
- Use the 80/20 rule: Spend about 80% of training time in Zones 1–2 and 20% in Zones 3–5 for optimal adaptation without overtraining
- Wear a chest strap or optical HR monitor: Wrist-based monitors can lag during intervals — chest straps provide the most accurate real-time data
- Don't ignore Zone 2: Easy training builds the aerobic engine that supports all other zones. Many athletes train too hard too often
- Recalculate periodically: As your fitness improves, your resting heart rate may drop, shifting your Karvonen-based zones
- Account for conditions: Heat, humidity, altitude, caffeine, and sleep quality all affect heart rate. Don't chase numbers on tough days