The maximum heart rate (MHR) is the highest number of beats per minute that the heart can reach during very intense physical activity.
This metric is essential for any athlete looking to structure their training, whether in running, trail running, cycling, or any other endurance sport.
However, the FCM is often misunderstood, underestimated, and sometimes confused in practice with other metrics such as maximum aerobic speed (MAS) or resting heart rate.
This article provides an overview of reliable methods for calculating your maximum heart rate, their limitations, and how to apply this value in a training program.
FCM Calculator
This calculator uses thegeneral formularecommended by the French National Authority for Health (HAS):Theoretical maximum heart rate = 220 − age(in years). This is anestimate, not a clinical measurement or a green light for maximum exertion.
Calculation method
Astrand: a widely used standard estimate (220 − age), included in general public guidelines such as those from the HAS. Gellish et al. (2007): regression model 207 − 0.7 × age. Both remain approximations, not a measured maximum heart rate.
Your age
Required value, between 15 and 100 years (general guideline).
Why is it important to know your maximum heart rate?
The MHR is used as a reference for establishing training heart rate zones.
Without this information, it is difficult to gauge the intensity of the workout: a basic endurance run, a session at the anaerobic threshold, or high-intensity interval training do not place the same demands on the cardiovascular system.
Knowing your maximum heart rate allows you to tailor each workout to your current fitness level, make progress without overloading your heart, and reduce the risk of overtraining.
It also serves as a monitoring tool: an abnormally high average heart rate during moderate exercise may indicate accumulated fatigue or an underlying health issue.
Methods for calculating your maximum heart rate
Formulas for estimating age
The most well-known formula is Astrand’s: 220 minus your age. For a 40-year-old runner, this yields a theoretical maximum heart rate of 180 bpm. This linear approach makes it very easy to calculate your theoretical maximum heart rate.
| Age (years) | Max heart rate (bpm) |
|---|---|
| 10 | 210 |
| 15 | 205 |
| 20 | 200 |
| 25 | 195 |
| 30 | 190 |
| 35 | 185 |
| 40 | 180 |
| 45 | 175 |
| 50 | 170 |
| 55 | 165 |
| 60 | 160 |
| 65 | 155 |
| 70 | 150 |
| 75 | 145 |
| 80 | 140 |
This approach has the advantage of simplicity, but it has a significant margin of error, ranging from 10 to 15 beats per minute depending on the individual.
The formula proposed by Gellish et al. ((207 − 0.7 × age) is considered more accurate in the scientific literature because it accounts for the fact that the relationship between age and FCM is not perfectly linear.
The Karvonen method, on the other hand, uses resting heart rate to refine the calculation of training zones, but it requires knowing your maximum heart rate beforehand.
In any case, a maximum heart rate estimated using a formula is still only an approximation. Two people of the same age, weight, and fitness level may have maximum heart rates that differ by more than 20 bpm. Genetic variations, gender (values differ slightly between men and women), and athletic background account for these differences.
The field test
To measure your maximum heart rate more reliably, a field test is a practical alternative.
The protocol typically consists of a gradual 10- to 15-minute warm-up, followed by a step-by-step increase in intensity over 6 to 8 minutes, culminating in a sustained maximum effort during the final 30 seconds.
The highest number displayed on the heart rate monitor or heart rate watch at the end of the workout corresponds to the measured maximum heart rate.
This test should be performed when the athlete is in good physical condition, ideally in their primary sport: maximum heart rate during running often differs from that measured during cycling or swimming, as the muscle groups involved are not the same.
Laboratory stress test
Elite athletes or runners training for a marathon or a long-distance trail race should undergo a stress test under medical supervision.
This test, performed using an electrocardiogram, not only allows for the accurate determination of the maximum heart rate but also helps detect any potential heart abnormalities.
It also provides additional data, such as the ventilatory threshold and VO2max, which are useful for developing a personalized training program.
This medical evaluation is recommended for anyone resuming intense physical activity or who has a risk factor for cardiovascular disease.
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Applying Your FCM to Training
Once the FCM value has been determined, training zones can be defined as a percentage of that value.
| Training zone | % of the FCM | Common name | Main objective | Sensations / Points of reference | Related session types |
|---|---|---|---|---|---|
| Zone 1 | 50–60% | Active recovery | Recovery, blood circulation | Very easy, normal breathing | Very light jog, cool-down |
| Zone 2 | 60–70% | Basic endurance | Basic Aerobic Training | Easy, conversation possible | Long runs, jogging |
| Zone 3 | 70–80% | Active endurance | Improved endurance | Moderate, slightly increased breathing, limited conversation | Brisk jogging, light pace |
| Zone 4 | 80–90% | Threshold (anaerobic) | Development of aerobic capacity | Difficult; only a few words can be exchanged | Tempo run, race-specific pace |
| Zone 5 | 90–100% | Maximum effort / VO2 max | Aerobic power, speed | Very difficult, gets out of breath quickly | Circuit training, sprints, short intervals |
For example, basic endurance typically falls between 60% and 70% of MHR: this is the ideal training zone for long runs and active recovery. The threshold zone, between 80% and 90% of MHR, corresponds to the specific pace for long-distance running and builds aerobic capacity. Above 90%, you enter the maximum effort zone, which is used during interval training or short sprints.
These zones aren’t set in stone. Heart rate varies depending on temperature, hydration, stress, sleep, and muscle fatigue. A tip often given by coaches: compare your heart rate data with how you feel and your running pace. A single number on a heart rate monitor never tells the whole story of a workout.
What the FCM Isn't Saying
The theoretical maximum heart rate does not measure physical fitness or performance. A sedentary person may have the same maximum heart rate as a trained athlete.
What changes with endurance training is the heart’s efficiency: stroke volume increases, resting heart rate decreases, and the body can perform the same amount of work with less cardiac effort. The maximum heart rate itself does not improve with training; it gradually decreases with age, regardless of fitness level.
Finally, it’s important to keep in mind that an individual’s actual maximum heart rate can vary slightly from year to year. Reassessing this data periodically—through a field or laboratory test—helps ensure that training zones remain consistent and that the training program is tailored to the athlete’s current physiological condition.
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Scientific references and sources
2 – French National Authority for Health— public information sheet “Physical activity: your best ally for health: distinguishing intensities by heart rate”; formula for theoretical maximum heart rate: 220 − age.
