Traditional 220 − age
HRmax = 220 − ageA very common rule of thumb. The American Heart Association currently uses approximately 220 minus age in its public target-heart-rate guidance and notes that the figures are averages.
Heart Rate · HRmax Comparison
Maximum Heart Rate Equations Calculator
Compare four recognized age-based maximum-heart-rate equations side by side. See each formula, its estimated bpm, and how much the estimates differ—without treating any equation as universally exact.
4 equations comparedInstant bpm estimatesNo universal “best” formula
Compare estimates
Enter your age
The calculator applies the same age to four published or commonly used HRmax equations so you can see the formula-to-formula variation directly.
ImportantThese results are estimates for fitness education. They are not a stress-test result, diagnosis, exercise clearance, or guarantee of a safe training ceiling.
Your equation comparison will appear here.Enter your age and calculate. With JavaScript enabled, the comparison updates instantly without reloading.
Formula guide
What each maximum heart rate equation represents
These formulas were not all developed from the same population or research design. Comparing them is useful because it shows why a single age-based number should not be treated as exact.
208 − 0.7 × age
HRmax = 208 − (0.7 × age)Tanaka and colleagues analyzed data from 351 studies involving 18,712 subjects, then cross-validated the relationship in 514 healthy adults.
211 − 0.64 × age
HRmax = 211 − (0.64 × age)The HUNT Fitness Study used verified maximal exercise tests from 3,320 healthy men and women. Its reported standard error of estimate was 10.8 bpm.
207 − 0.7 × age
HRmax = 207 − (0.7 × age)This equation came from longitudinal modeling of repeated graded exercise tests, adding a different research design to the age-HRmax evidence base.
Interpretation
Why your true maximum can differ from every estimate
Age explains an important part of the population trend in maximal heart rate, but equations cannot capture all individual variation. The number reached in a properly conducted maximal exercise test may sit above or below an age-predicted value.
Use estimates as orientation
An equation can help set an initial reference point, but it should not be treated as a physiological speed limit.
Do not confuse maximum HR with a training target
Most workouts are performed below maximum. Target zones use a percentage of HRmax or heart-rate reserve depending on the method.
Context changes heart-rate response
Medication, health conditions, fatigue, heat, hydration, altitude, device accuracy, and exercise mode can all affect observed heart rate.
Measured values require appropriate testing
A maximal test is physically demanding. When medical risk or symptoms are relevant, testing and training intensity should be discussed with a qualified clinician.
Worked example
Age 35 produces a range of estimates
At age 35, the formulas do not return one identical maximum heart rate. That difference is the central reason this tool shows several equations side by side.
Example · age 35
220 − 35 = 185 bpm208 − (0.7 × 35) = 183.5 ≈ 184 bpm211 − (0.64 × 35) = 188.6 ≈ 189 bpm207 − (0.7 × 35) = 182.5 ≈ 183 bpmDisplayed comparison range: 183–189 bpm across these four equations.
Related fitness tools
Use HRmax estimates in the right context
Tool guide
Understand and use the Maximum Heart Rate Equations Calculator
Use these tool-specific notes to understand the method, enter better data, interpret the output, and apply the result appropriately.
Predicted HRmax
Age-based equations estimate population-average maximum heart rate. They are convenient planning tools but can differ substantially from an individual measured maximum.
Compare Equations
The page shows 220−age, Tanaka, Nes/HUNT, and Gellish estimates side by side. Different regression datasets produce different predictions, so no single equation is declared universally correct.
Use for Zones
A predicted maximum can be used in percentage-based training zones, but error in HRmax carries directly into those zone boundaries.
Prefer Real Context
A properly obtained measured maximum may be more individual than an age equation when appropriate and safe. Medications and medical conditions can also make generic predictions less useful.
Frequently asked questions
Maximum Heart Rate Equations Calculator FAQs
Practical answers about this tool's inputs, method, results, limitations, and common real-world use.
What is maximum heart rate?
HRmax is the highest heart rate reached during maximal effort. An age equation predicts it; it does not directly measure your individual maximum.
Which equation is most accurate?
No equation is universally exact for every person. Different formulas were developed from different populations and study designs, and individual prediction error remains meaningful.
Why is 220 minus age still used?
It is simple and widely recognized. The American Heart Association uses it as an approximate public guide while explicitly describing age-based figures as averages.
What is the Tanaka formula?
Tanaka et al. proposed HRmax = 208 − 0.7 × age after a large meta-analysis and laboratory cross-validation in healthy adults.
What does the equation spread mean?
It is simply the difference between the highest and lowest estimates from the four formulas shown. It is not a personal confidence interval or safety margin.
Can beta blockers or other medicines affect this?
Yes. Some medicines and medical conditions change the heart-rate response to exercise. Generic age equations may be less useful when those factors are present.
Why can the equations differ by more than 10 bpm?
Each regression was derived from a different sample and statistical model. Age explains only part of the variation in true maximum heart rate, so prediction spread is expected.
Can I replace an estimated HRmax with a measured value?
Yes for calculations that accept a custom maximum, provided the measured value came from an appropriate test and is relevant to your training mode. A random high watch reading is not automatically a verified maximum.
Does training increase maximum heart rate?
Training strongly affects many performance measures, but HRmax is not trained upward in the same way as aerobic capacity. Age, individual physiology, testing mode, and measurement conditions are major influences.
Can heart-rate medications make age formulas misleading?
Yes. Some medications blunt or alter exercise heart-rate response. Generic age-predicted maxima and percentage zones may not be appropriate without individualized guidance.
References
Equation and heart-rate guidance sources
- American Heart Association. Target Heart Rates Chart (reviewed August 12, 2024).
- Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol. 2001.
- Nes BM, Janszky I, Wisløff U, Støylen A, Karlsen T. Age-predicted maximal heart rate in healthy subjects: The HUNT Fitness Study. 2013.
- Gellish RL et al. Longitudinal modeling of the relationship between age and maximal heart rate. Med Sci Sports Exerc. 2007.
Content reviewed: .
Health & training note
This calculator provides general fitness information only. Estimated HRmax should not be used to ignore symptoms, override medical advice, or determine exercise safety on its own. If you have cardiovascular disease, concerning symptoms, relevant medications, or uncertainty about maximal exercise, seek individualized professional guidance.