Max Heart Rate Calculator
Example 1
A 40-year-old person wants to calculate their maximum heart rate and training zones using the Tanaka formula. The Tanaka formula estimates HRmax as 208 − (0.7 × age).
Solution
Apply the Tanaka formula: HRmax = 208 − (0.7 × age).
Zone 2 (moderate intensity, 64 to 76% of HRmax): lower limit = 180 × 0.64 = 115 bpm, upper limit = 180 × 0.76 = 137 bpm.
Zone 4 (vigorous intensity, 86 to 96% of HRmax): lower limit = 180 × 0.86 = 155 bpm, upper limit = 180 × 0.96 = 173 bpm.
This shows how the estimated HRmax determines the boundaries of each training zone.
Answer
HRmax = 180 bpm. Moderate zone (Zone 2) is 115 to 137 bpm. Vigorous zone (Zone 4) is 155 to 173 bpm.
Example 2
A 50-year-old and a 25-year-old want to compare their estimated maximum heart rates and understand how age affects cardiovascular capacity.
Solution
Calculate HRmax for the 50-year-old using the Tanaka formula: HRmax = 208 − (0.7 × 50).
Calculate HRmax for the 25-year-old using the same formula: HRmax = 208 − (0.7 × 25).
The difference of 25 years in age produces an HRmax difference of 18 bpm, or approximately 0.7 bpm per year, which matches the Tanaka formula coefficient.
Answer
Maximum heart rate decreases with age. At age 25, HRmax is 191 bpm. At age 50, HRmax is 173 bpm. The 18 bpm difference reflects the expected age-related decline.
Source: Gulati M, et al. Exercise capacity and the risk of death in women. Circulation, 2010
Example 3
A 35-year-old with a resting heart rate (RHR) of 65 bpm wants to calculate their target heart rate at 70% intensity using the Karvonen formula. First, estimate HRmax using the Fox formula: 220 − 35 = 185 bpm.
Solution
Calculate heart rate reserve (HRR): HRR = HRmax − RHR.
Apply the Karvonen formula: Target HR = RHR + (Intensity × HRR).
At 70% intensity, the target heart rate is 149 bpm. Compare this with 70% of max HR alone (0.70 × 185 = 130 bpm) to see how the Karvonen formula produces a higher and more accurate target.
Answer
149 bpm is the target heart rate at 70% intensity using the Karvonen formula. The heart rate reserve method accounts for individual resting heart rate, producing a more personalised target.
Source: Karvonen MJ, Kentala E, Mustala O. The effects of training on heart rate. Acta Medica Scandinavica, 1957
Example 4
A 45-year-old wants to exercise in zone 2 (60-70% of HRmax). What is their target heart rate range using the Tanaka formula?
Solution
Zone 2 lower: 176.5 × 0.60 = 106 bpm. Zone 2 upper: 176.5 × 0.70 = 124 bpm.
Compare with Fox formula: 220 - 45 = 175 bpm, giving virtually the same zone at 105-123 bpm.
Answer
Zone 2 target: 106-124 bpm. The Tanaka and Fox formulas agree within 1 bpm for this age.
Source: Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol, 2001
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References
- [1]American Heart Association, <a href="https://www.heart.org" target="__blank">American Heart Association</a> - Target Heart Rates Chart. https://www.heart.org/en/healthy-living/fitness/fitness-basics/target-heart-rates
- [2]American College of Sports Medicine, <a href="https://www.acsm.org" target="__blank">American College of Sports Medicine</a> - ACSM Guidelines for Exercise Testing and Prescription. https://www.acsm.org/education-resources/books/guidelines-exercise-testing-prescription
- [3]Journal of the American College of Cardiology, Tanaka H, Monahan KD, Seals DR - Age-predicted maximal heart rate revisited. Journal of the American College of Cardiology, 2001, 2001. https://pubmed.ncbi.nlm.nih.gov/11284954/
Glossary
- Maximum heart rate (HRmax) – The highest number of beats your heart can achieve per minute during maximal physical exertion. Declines progressively with age at approximately 0.5 to 0.9 bpm per year.
- Resting heart rate (RHR) – Your heart rate when fully awake, calm, and seated. Normal adult range is 60 to 100 bpm, with well-trained athletes often at 40 to 50 bpm.
- Heart rate reserve (HRR) – The difference between maximum heart rate and resting heart rate (HRR = HRmax − RHR). Represents the heart rate capacity available for exercise and is used in the Karvonen formula.
- Target heart rate zone – A percentage range of your maximum heart rate used to structure exercise intensity. The five standard zones range from very light (50 to 60% of HRmax) to maximum (90 to 100%).
- Karvonen formula – The heart rate reserve method for calculating target heart rate: Target HR = RHR + %Intensity × (HRmax − RHR). More accurate than simple percentage of HRmax.
- Tanaka formula – An alternative formula for estimating HRmax: 208 − (0.7 × age). Considered more accurate than the Fox formula for the general population across a wider age range.
- Moderate intensity – Exercise at 64 to 76% of HRmax or 46 to 64% of VO2max. Corresponds to Zone 2 training where conversation is possible but breathing is elevated.
- Vigorous intensity – Exercise at 77 to 95% of HRmax or 64 to 90% of VO2max. Corresponds to Zones 3 and 4 where conversation becomes difficult and breathing is deep.
- Aerobic threshold – The exercise intensity at which lactate begins to accumulate in the blood above resting levels. Typically occurs around 50 to 60% of VO2max or 60 to 70% of HRmax.
- Anaerobic threshold – The exercise intensity at which lactate production exceeds the body's ability to clear it, causing rapid accumulation. Typically occurs around 80 to 90% of HRmax.
How to Use?
- 1
Enter your age
Type your age in years. The calculator needs your age to estimate your maximum heart rate using the appropriate formula for your gender.
- 2
Select your gender
Choose Male or Female. Males use the Fox formula (220 − age). Females use the Gulati formula (206 − 0.88 × age), which is more accurate for women.
- 3
Review your max HR and training zones
The calculator displays your estimated maximum heart rate in bpm and the full range (low to high) for each of the five training zones. Each zone shows the lower and upper bpm limits.
- 4
Check the heart rate scale
The colour-coded scale below your result shows where your estimated max HR falls on a five-zone spectrum from 100 to 220 bpm. The zone reference table under the inputs lists the intensity levels for each zone.
- 5
Apply the zones to your training
Program your chest-strap monitor or smartwatch with your max HR so device automatically tracks time in each zone. Use Zone 2 for aerobic base training, Zone 3 for tempo efforts, and Zone 4 for high-intensity intervals. Use the reference table below for more detail on each zone.
- 6
Verify your max HR with a field test
For the most accurate zones, perform a graded exercise test as described in the how-to section. Use the measured peak HR from the test in place of the formula estimate for your ongoing training.
Frequently Asked Questions
Maximum heart rate (max HR) is the highest number of beats your heart can achieve in one minute during maximal exertion. It matters because it is the reference point for calculating personalised training zones. Without an accurate max HR, your heart rate monitor cannot set appropriate zones, and your workouts may be too easy to produce results or too hard to sustain safely. The Fox formula (220 minus age) and Gulati formula (206 minus 0.88 times age) provide population-level estimates that serve as useful starting points for recreational athletes and fitness enthusiasts.
The Fox formula is a population average with a standard deviation of ±10 to 12 bpm, meaning approximately 68% of people have a true max HR within 10 to 12 beats of the formula estimate. It is accurate enough for general fitness guidance but not precise enough for competitive athletes or individuals with health conditions. For women, the Gulati formula (206 minus 0.88 times age) is more accurate than the Fox formula. For the highest accuracy, a graded exercise test with ECG monitoring from a sports medicine professional is recommended.
Exceeding your true maximum heart rate is physiologically very difficult because the cardiovascular system has a natural ceiling. However, if your estimated max HR is lower than your actual max HR (e.g., the formula estimates 180 but your true max is 195), your monitor may show a heart rate above the estimated value. This is safe as long as you are not experiencing warning symptoms. If you have heart disease, take heart rate-lowering medications, or experience chest pain, dizziness, or palpitations at any heart rate, stop exercising and consult a doctor.
Spend 70 to 80% of your weekly training time in Zones 1 and 2 for aerobic base building. Use Zone 3 for tempo runs or sustained efforts once or twice per week. Use Zone 4 for high-intensity intervals no more than twice per week, with at least 48 hours between sessions. Use Zone 5 sparingly, if at all, and only after building a solid aerobic foundation. The bar chart on this page shows your zone ceilings, and the reference table provides detail on the talk test, RPE, and energy system for each zone.
The so-called fat-burning zone is Zone 2 (60 to 70% of max HR), where the body relies primarily on fat as a fuel source. However, total calorie burn is lower at this intensity than at higher intensities. For weight loss, the most effective approach is to maximise total weekly calorie expenditure by combining Zone 2 volume with higher-intensity Zone 4 intervals, which increase post-exercise oxygen consumption (EPOC) and elevate calorie burn for hours after exercise. The BMR Calculator and Daily Calorie Needs Calculator on this site can help you align your nutrition with your training volume for weight loss.
Max HR decreases with age but does not increase with fitness training. However, your heart rate at any sub-maximal exercise intensity decreases as your fitness improves. If you can run at 8 km/h at 145 bpm today and 135 bpm after eight weeks of training, your cardiovascular fitness has improved even though your max HR has not changed. Resting heart rate is the more sensitive indicator of fitness changes: a drop of 5 to 10 bpm in resting heart rate over weeks of training signals meaningful cardiovascular adaptation.
Age is the primary factor, with max HR declining 0.5 to 0.9 bpm per year. Genetics accounts for 30 to 50% of individual variation. Medications such as beta-blockers lower max HR by 20 to 40 bpm. Altitude above 2,500 metres reduces max HR by 5 to 10 bpm. Dehydration can also reduce max HR because lower blood volume limits the heart's ability to pump blood. Heat increases heart rate at any given intensity but does not change the max HR ceiling itself.
The most accurate method is a graded exercise stress test with ECG monitoring performed by a sports medicine professional. A simpler field test: warm up for 10 to 15 minutes, then run or cycle at progressively increasing effort each minute. Continue until you cannot maintain the pace for a full minute. Record your peak heart rate from a chest-strap monitor during the final 15 seconds. Cool down for 5 to 10 minutes at easy effort. Do not perform a maximal test without medical clearance if you are over 45, have health conditions, or are not accustomed to vigorous exercise.
Yes. Research published by Gulati and colleagues in 2010 showed that the Fox formula (220 minus age) systematically overestimates max HR for women. The Gulati formula (206 minus 0.88 times age) is more accurate. For a 40-year-old woman, the Fox formula gives 180 bpm while the Gulati formula gives 171 bpm, a 9-bpm difference that is clinically significant for exercise prescription. This calculator uses the Gulati formula for females and the Fox formula for males.
At altitudes above 2,500 metres, max HR decreases by approximately 5 to 10 bpm because the lower oxygen concentration limits oxygen delivery. Your cardiovascular system compensates by increasing ventilation and cardiac output, but the max HR ceiling drops. If you travel to altitude for training, subtract 5 to 10 bpm from your estimated max HR when setting training zones, and reduce your expected exercise pace accordingly. Allow 7 to 14 days for partial acclimatisation, during which your heart rate responses will gradually return toward sea-level values.
Yes. Beta-blockers such as metoprolol and atenolol lower both resting and exercise heart rate by 20 to 40 bpm. Calcium channel blockers like diltiazem also reduce exercise heart rate. If you take heart rate-lowering medications, the formula estimates from this calculator will be too high. Do not use these estimates for exercise prescription. Ask your cardiologist for individualised exercise heart rate targets determined from a medication-adjusted exercise stress test. The talk test and RPE scale are useful cross-checks if you are on heart rate-lowering medications.
Max HR is the highest heart rate achievable during maximal exertion. Resting HR is the lowest heart rate when fully awake and calm. The difference between them is called heart rate reserve (HRR). Resting HR is a sensitive indicator of fitness: a well-trained athlete may have a resting HR of 40 to 50 bpm, while a sedentary person may have 70 to 80 bpm. Max HR does not change with fitness training, but resting HR decreases as the heart becomes more efficient. Tracking resting HR over weeks and months is the simplest way to measure cardiovascular fitness improvement.
The Karvonen formula (also called the heart rate reserve method) calculates target heart rate as: Target HR = Resting HR + %Intensity × (Max HR − Resting HR). It accounts for individual differences in resting heart rate, making it more accurate than the simple percentage-of-max-HR method for people with higher or lower resting HR. For example, a person with a resting HR of 80 bpm and a max HR of 170 bpm targeting 70% intensity gets: 80 + 0.7 × (170 − 80) = 143 bpm. The same person using 70% of max HR alone gets 119 bpm. The Karvonen method produces a higher and more accurate target. This calculator uses the simpler percentage-of-max method for general use.
Spend the majority of your training time (70 to 80%) in Zones 1 and 2, which build aerobic capacity with minimal fatigue. Limit Zone 3 work to once or twice per week for 20 to 40 minutes per session. Limit Zone 4 intervals to twice per week with at least 48 hours between sessions. Each Zone 4 interval should last 1 to 5 minutes with equal or longer recovery. Zone 5 efforts should be 30 seconds to 2 minutes with at least 4 minutes of recovery between efforts, and no more than once per week. The total time spent in Zone 5 should not exceed 5 minutes per session for recreational athletes.
Consult a doctor if your resting heart rate is consistently above 100 bpm (tachycardia) or below 40 bpm without being a trained athlete. Seek medical attention if you experience chest pain, shortness of breath, dizziness, fainting, or palpitations during exercise at any heart rate. If your heart rate does not increase normally during exercise (chronotropic incompetence) or takes longer than 10 to 15 minutes to return to near-resting levels after exercise, discuss this with your healthcare provider. The American College of Sports Medicine recommends medical screening before starting vigorous exercise for all sedentary individuals over 45 and for anyone with known cardiovascular risk factors.
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