Maximal heart rate is calculated by subtracting your age from 220
Use this interactive calculator to estimate your maximum heart rate, compare common formulas, and see your training zones for cardio, endurance, and interval work.
Classic formula: 220 minus age.
Different formulas may fit different populations.
Used to estimate heart rate reserve.
Highlights a practical target zone.
What does “maximal heart rate is calculated by subtracting your age from” mean?
The classic answer is 220. In the most widely known fitness formula, your estimated maximal heart rate, often written as HRmax, is calculated by subtracting your age from 220. So if you are 40 years old, the traditional estimate is 220 minus 40, which equals 180 beats per minute. This number is used as a reference point for setting exercise intensity zones, planning cardio workouts, and understanding how hard your heart is working during training.
Even though the 220 minus age method is simple, its popularity comes from convenience rather than perfect precision. It gives coaches, clinicians, and exercisers a very fast way to estimate an upper heart rate limit for exercise. That estimate can then be used to identify lighter effort, moderate aerobic work, threshold training, and high intensity intervals.
It is important to understand that maximum heart rate is not the same thing as your ideal exercise heart rate for all workouts. Most training is done at a percentage of estimated maximum heart rate. For many adults, moderate intensity exercise is often discussed in a range around 50 percent to 70 percent of maximum heart rate, while vigorous intensity may be framed around 70 percent to 85 percent. Those percentages are practical because they make one formula useful across many goals.
The classic formula: 220 minus age
The standard formula works like this:
- Start with 220.
- Subtract your age.
- The result is your estimated maximal heart rate in beats per minute.
Examples:
- Age 20: 220 – 20 = 200 bpm
- Age 30: 220 – 30 = 190 bpm
- Age 45: 220 – 45 = 175 bpm
- Age 60: 220 – 60 = 160 bpm
This formula remains common in gyms, wearable fitness products, school health classes, and general exercise advice because it is easy to remember and fast to apply. However, researchers have shown that individual variation can be significant. Two people of the same age can have noticeably different true maximal heart rates because of genetics, training history, medication use, and other physiological factors.
Why maximum heart rate matters for training
Maximum heart rate is useful because it helps structure exercise intensity. Rather than relying only on pace or subjective effort, many people like to use heart rate zones. These zones can guide a workout toward a specific purpose:
- 50 percent to 60 percent of HRmax: very light to light activity, warmups, walking, and recovery work
- 60 percent to 70 percent of HRmax: steady aerobic activity, base building, and general health improvement
- 70 percent to 80 percent of HRmax: moderate to hard training, often used for improving endurance
- 80 percent to 90 percent of HRmax: vigorous efforts, tempo sessions, and demanding intervals
- 90 percent to 100 percent of HRmax: near maximal work, very short bursts, and performance testing
For example, someone with an estimated maximal heart rate of 180 bpm would have a moderate exercise range around 90 to 126 bpm at 50 percent to 70 percent and a vigorous range around 126 to 153 bpm at 70 percent to 85 percent. A coach might still adjust these numbers based on the person’s sport, conditioning level, and measured response during exercise.
How accurate is 220 minus age?
The formula is best understood as a practical estimate. It is not a universal truth. In exercise science, researchers have found that the traditional formula can produce substantial prediction error for some people. That is one reason alternative formulas exist. One of the best known alternatives is the Tanaka formula: 208 – 0.7 x age. Another commonly referenced equation for women is the Gulati formula: 206 – 0.88 x age.
The reason these alternatives matter is that heart rate behavior changes with age, sex, fitness status, and the specific population studied. A formula developed from one group may not fit another group equally well. That does not make 220 minus age useless. It simply means that users should avoid treating the estimate as exact.
| Age | 220 – age | Tanaka: 208 – 0.7 x age | Gulati: 206 – 0.88 x age | Difference from classic formula |
|---|---|---|---|---|
| 20 | 200 bpm | 194 bpm | 188 bpm | Classic is 6 to 12 bpm higher |
| 30 | 190 bpm | 187 bpm | 180 bpm | Classic is 3 to 10 bpm higher |
| 40 | 180 bpm | 180 bpm | 171 bpm | Classic matches Tanaka, higher than Gulati |
| 50 | 170 bpm | 173 bpm | 162 bpm | Classic is 3 bpm lower than Tanaka |
| 60 | 160 bpm | 166 bpm | 153 bpm | Classic is 6 bpm lower than Tanaka |
The table above shows why formula choice can matter. At some ages, formulas are fairly close. At others, the difference can be meaningful enough to shift exercise zones by several beats per minute. For a casual exerciser, that may not matter much. For an endurance athlete or someone in cardiac rehabilitation, it can matter more.
What do major health organizations say?
Authoritative public health guidance often uses age-predicted heart rate for practical exercise recommendations. For example, the Centers for Disease Control and Prevention discusses target heart rate ranges for moderate and vigorous intensity activity. The National Heart, Lung, and Blood Institute also explains exercise intensity concepts and how heart rate can help monitor effort. For deeper exercise physiology and training principles, many readers also consult educational resources from institutions such as the Johns Hopkins Medicine health education site.
These sources generally agree on the practical value of target heart rate guidance, while also recognizing that formulas estimate rather than directly measure true maximal capacity.
Target zones based on percentages of maximum heart rate
Once you know your estimated maximum heart rate, the next step is usually to calculate percentages. Below is a practical comparison using a person with an estimated HRmax of 180 bpm.
| Zone | Percentage of HRmax | Heart rate at HRmax 180 | Primary use |
|---|---|---|---|
| Zone 1 | 50% to 60% | 90 to 108 bpm | Recovery, warmup, easy movement |
| Zone 2 | 60% to 70% | 108 to 126 bpm | Aerobic base and steady cardio |
| Zone 3 | 70% to 80% | 126 to 144 bpm | Tempo and moderate endurance work |
| Zone 4 | 80% to 90% | 144 to 162 bpm | Threshold efforts and hard intervals |
| Zone 5 | 90% to 100% | 162 to 180 bpm | Near maximal bursts and testing |
When 220 minus age can be especially misleading
Although the formula is convenient, there are several situations where relying on it too heavily can be unhelpful or even inappropriate:
- Medication use: Beta blockers and some other drugs can lower exercise heart rate response.
- Cardiovascular or metabolic disease: A clinician may recommend different monitoring strategies.
- Highly trained endurance athletes: Atypical cardiovascular adaptations can make simple formulas less informative.
- Beginners with anxiety about exercise: Heart rate can rise from stress and not just workload.
- Hot weather, dehydration, or altitude: Environmental stress can elevate heart rate at lower power outputs.
For these reasons, many coaches pair heart rate with other tools such as pace, power, breathing pattern, and the talk test. If you can speak in full sentences, you are often in a lower intensity range. If talking becomes difficult, you are likely in a more vigorous zone.
Maximum heart rate versus heart rate reserve
Another useful concept is heart rate reserve, often abbreviated HRR. This method takes your resting heart rate into account. Instead of using only maximum heart rate, it looks at the difference between maximum and resting values. The popular Karvonen method estimates training heart rate with this formula:
Target heart rate = ((HRmax – resting heart rate) x intensity) + resting heart rate
For example, if your estimated HRmax is 180 and your resting heart rate is 60, your reserve is 120. At 70 percent intensity, your target would be (120 x 0.70) + 60 = 144 bpm. Some trainers prefer this approach because it can better personalize the effort range, especially when two people have the same age but very different resting heart rates.
How to use your estimate safely
- Use the formula as a starting point, not an absolute limit.
- Begin with lower intensity zones if you are new to exercise.
- Track how you feel along with your heart rate.
- Adjust your workouts if heat, illness, poor sleep, or stress changes your normal response.
- Talk to a healthcare professional before vigorous exercise if you have symptoms, chronic conditions, or are returning after a long break.
If you are exercising mainly for health, consistency matters more than chasing a perfectly precise number. A useful estimate that helps you stay active is often better than waiting for a laboratory-grade test that you may never get.
Frequently asked question: is 220 always the number you subtract from?
In the traditional formula, yes. The classic answer is 220. But in broader exercise science, no single number is universally best for everyone. Alternative equations use different constants and age multipliers, which is why calculators like the one above let you compare methods. If someone asks, “maximal heart rate is calculated by subtracting your age from what number?” the standard textbook response is still 220.
Best practical takeaway
If you want the simplest possible answer, your estimated maximum heart rate is calculated by subtracting your age from 220. That estimate can then help you identify moderate and vigorous exercise zones. Just remember that formulas are approximations. If your workout data, wearable readings, or supervised exercise testing suggest a different pattern, those real-world measurements may better reflect your actual physiology.
Use the calculator above to compare formulas, estimate your maximum heart rate, and explore the training zones that fit your current goal. For health-focused exercise, the best plan is usually one you can perform consistently, safely, and progressively over time.