Target Heart Rate Calculator
Calculate your target heart rate zones for exercise.
Understanding Target Heart Rate Calculator
Target heart rate is a range of heart rates that can be used to estimate exercise intensity during aerobic activity. Instead of treating exercise intensity as simply easy or hard, target heart-rate zones provide numerical ranges that can help people structure workouts and monitor how hard they are exercising.
This calculator uses the heart-rate-reserve method, commonly associated with the Karvonen formula. Unlike a calculation based only on age, this approach incorporates both estimated maximum heart rate and resting heart rate. Because resting heart rate differs between individuals, using heart rate reserve can provide a more personalized training estimate than simply multiplying maximum heart rate by a percentage.
Using the result in context
To use Target Heart Rate Calculator effectively, enter the values requested by the calculator and keep their units and meaning consistent. The main information requested on this page includes Age, Resting Heart Rate (bpm). If the calculator offers selectable methods or options, choose the one that matches the question you are trying to answer.
When the result is an estimate
The result is calculated from the inputs shown on this page, so it is most useful when you understand what each input represents. Before relying on the number, check the units, the scale of the result, and any assumptions described above the calculator.
About Target Heart Rate Calculator
Target heart rate is a range of heart rates that can be used to estimate exercise intensity during aerobic activity. Instead of treating exercise intensity as simply easy or hard, target heart-rate zones provide numerical ranges that can help people structure workouts and monitor how hard they are exercising.
This calculator uses the heart-rate-reserve method, commonly associated with the Karvonen formula. Unlike a calculation based only on age, this approach incorporates both estimated maximum heart rate and resting heart rate. Because resting heart rate differs between individuals, using heart rate reserve can provide a more personalized training estimate than simply multiplying maximum heart rate by a percentage.
How Target Heart Rate Is Calculated
The calculation begins by estimating maximum heart rate using the age-based formula of 220 minus age. Heart rate reserve is then calculated by subtracting resting heart rate from estimated maximum heart rate.
Maximum HR = 220 − Age
Heart Rate Reserve:
HRR = Maximum HR − Resting HR
Target Heart Rate:
Target HR = Resting HR + (HRR × Exercise Intensity)
For example, a 30-year-old person with a resting heart rate of 70 bpm has an estimated maximum heart rate of 190 bpm. The heart rate reserve is therefore 120 bpm. At 60% intensity, the estimated target heart rate is approximately 142 bpm.
What Is Heart Rate Reserve?
Heart Rate Reserve (HRR) represents the difference between estimated maximum heart rate and resting heart rate. It is useful because it takes the person's resting pulse into account rather than assuming that everyone with the same age has the same exercise heart-rate response.
A lower resting heart rate can result in a different target heart-rate calculation even when two people have the same age. Resting heart rate is influenced by fitness, recovery, stress, sleep, illness, hydration, medications, and other individual factors.
Common Target Heart Rate Zones
Exercise intensity can be represented as a percentage of heart rate reserve. The ranges below are general training references rather than strict physiological boundaries.
60% HRR — Moderate aerobic effort
70% HRR — Moderate to vigorous effort
75% HRR — Vigorous aerobic effort
80% HRR — High-intensity effort
85% HRR — Vigorous to very hard effort
90% HRR — Very high-intensity effort
Moderate and Vigorous Exercise
This calculator highlights two broad ranges. The moderate zone is calculated from 50% to 70% of heart rate reserve, while the vigorous zone is calculated from 70% to 85%. These ranges can be useful when planning aerobic workouts, although the appropriate intensity depends on the individual's fitness, exercise experience, health, and training objective.
Heart rate is only one way to judge exercise intensity. Breathing rate, perceived exertion, exercise performance, and the ability to speak during activity can also provide useful information about how demanding a workout feels.
Target Heart Rate Example
Resting Heart Rate: 70 bpm
Maximum HR = 220 − 30 = 190 bpm
HRR = 190 − 70 = 120 bpm
50% HRR = 70 + (120 × 0.50) = 130 bpm
60% HRR = 70 + (120 × 0.60) = 142 bpm
70% HRR = 70 + (120 × 0.70) = 154 bpm
80% HRR = 70 + (120 × 0.80) = 166 bpm
85% HRR = 70 + (120 × 0.85) = 172 bpm
Target Heart Rate vs. Maximum Heart Rate
Maximum heart rate represents the approximate upper limit used by the calculation, whereas target heart rate describes a working range during exercise. Training at a percentage of estimated maximum heart rate and training at a percentage of heart rate reserve are therefore not exactly the same calculation.
The heart-rate-reserve method generally uses the resting pulse as part of the calculation. This can make the resulting target ranges more responsive to differences in resting heart rate between individuals.
Why Maximum Heart Rate Is Only an Estimate
The formula 220 minus age is a traditional population-based estimate and does not predict the exact maximum heart rate of every individual. Actual maximum heart rate can vary considerably among people of the same age.
Because the maximum heart rate is estimated, every target zone derived from it is also an estimate. The result should therefore be viewed as a practical training reference rather than an exact measurement of cardiovascular capacity.
Factors That Can Affect Heart Rate
Heart rate during exercise can change because of temperature, humidity, hydration, stress, sleep, fatigue, caffeine, illness, training status, altitude, and exercise type. Heart rate can also be affected by certain medications, particularly medications that increase or decrease the heart rate response to exercise.
These factors are not individually measured by this calculator, so the calculated target range may not perfectly represent the intensity of a particular workout.
How to Use the Result
Enter your age and a representative resting heart rate. The calculator estimates your maximum heart rate and heart rate reserve, then calculates several intensity points and highlights moderate and vigorous target ranges.
For training, it can be useful to monitor how your heart rate behaves over time rather than focusing on a single reading. Consistent workouts, adequate recovery, and gradual progression are generally more useful than trying to remain at an exact heart rate throughout every session.
Understanding Resting Heart Rate
Resting heart rate is typically measured when the body is relaxed and has not recently been exposed to exercise or other factors that temporarily elevate the pulse. Measuring under similar conditions can make readings easier to compare from day to day.
A change in resting heart rate can occur for many reasons and does not by itself indicate an improvement or decline in fitness. Trends over time are generally more informative than a single measurement.
Important Considerations
Target heart-rate calculations are intended as general exercise-planning estimates. They do not diagnose cardiovascular conditions and cannot determine whether a particular exercise intensity is appropriate for an individual.
People who have cardiovascular conditions, take medications that affect heart rate, experience unusual symptoms during exercise, or have specific medical restrictions may need individualized exercise guidance from a qualified healthcare professional. Stop exercising and seek appropriate medical attention if exercise produces severe or concerning symptoms.
Medical Disclaimer
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional for medical decisions.