Maximum Heart Rate Calculator (5 formulas)

Understanding the maximum heart rate calculator — concept and principle

Maximum heart rate (HRmax) is the highest number of beats per minute your heart reaches during an all-out effort. It is the anchor for most heart rate training zones. Because a true maximal test is hard and not suitable for everyone, people usually estimate it from age. This calculator shows five well-known age formulas side by side so you can see how much they disagree.

The formulas agree within a few beats, but any one person can be well off the estimate.

How it is calculated

Tanaka: 208 − 0.7 × age
Fox (classic): 220 − age
Gellish: 207 − 0.7 × age
Nes: 211 − 0.64 × age
Gulati (women): 206 − 0.88 × age

Age is in years and every result is in beats per minute (bpm), rounded to a whole number.

The principle

Maximum heart rate falls steadily with age, largely because of changes in the heart's own pacemaker and its response to adrenaline, and it is affected little by training. Researchers measured HRmax in large groups and drew the best-fitting straight line through age. The classic 220 − age line was an early rule of thumb; Tanaka's 2001 meta-analysis and later studies such as Gellish (2007) and Nes (2013, the Norwegian HUNT study) produced lines that fit adults better, and Gulati (2010) fitted a separate line for women. Each line is an average: individuals scatter around it by roughly ±10 bpm or more.

Worked example

Input: age 35.
Tanaka: 208 − 0.7 × 35 = 183.5 → 184.
Fox: 220 − 35 = 185.
Gellish: 207 − 24.5 = 182.5 → 183.
Nes: 211 − 0.64 × 35 = 188.6 → 189.
Gulati: 206 − 0.88 × 35 = 175.2 → 175.

Each point is the calculator re-run with only “Age” changed; the gold point is the default example. Change the inputs above and this chart follows your numbers.

Age	Tanaka (208 − 0.7 × age)
8.75	202
17.5	196
26.2	190
35	184
43.8	177
52.5	171
70	159

How to read the result

The spread between formulas (here 175 to 189 bpm) is a reminder that none of them knows your heart. Pick one formula and use it consistently for zones. If your watch regularly shows peaks above the estimate during hard races, your real maximum is higher; use that observed value. A lower or higher HRmax is not a sign of better or worse fitness.

Common mistakes

Treating the result as a safe upper limit or a goal to reach.
Using 220 − age for older adults, where it tends to underestimate.
Comparing your HRmax with friends' as a fitness score.

Keep in mind: These are population estimates, not a diagnosis. Medicines such as beta-blockers, heart conditions and altitude change heart rate response. Only perform a maximal test if you are healthy, and under supervision if you have any risk factors.

Frequently asked questions

Which formula is the most accurate?

For healthy adults, Tanaka and Gellish usually fit better than 220 − age. For women, Gulati was derived from a large female sample. None is accurate for every individual.

Can training raise my maximum heart rate?

Not meaningfully. Training lowers resting heart rate and raises stroke volume, while HRmax mostly follows age.

How can I measure my real maximum?

A clinical exercise test is most reliable. A hard uphill run with a chest strap, after a thorough warm-up, gives a practical estimate.

Sources: Tanaka H., Monahan K. D., Seals D. R., Journal of the American College of Cardiology, 2001 · Gellish R. L. et al., Medicine & Science in Sports & Exercise, 2007 · Nes B. M. et al., Scandinavian Journal of Medicine & Science in Sports, 2013 · Gulati M. et al., Circulation, 2010

Checked 8 Nov 2026. Published formulas cited on the page. For information only — not medical advice.

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