About the Max Heart Rate Calculator
Your maximum heart rate is the highest rate your heart reaches in an all-out effort. It sets the top of every training zone, and for most people it is estimated from age rather than measured.
There are several age formulas, and a lot of attention goes on which one is "right". That attention is mostly misplaced, for two reasons this max heart rate calculator puts side by side.
The well-founded formulas agree closely. Through most of adult life they land within a few beats of each other.
People do not agree with the formulas. Individual maximums scatter about ±10 beats per minute around any prediction — several times the gap between the good formulas.
So the calculator shows every formula, then shows the range where people of your age actually fall. The second number is the more useful one.
How to Use the Max Heart Rate Calculator
Enter your age. Choose your sex — if female, Gulati's formula, derived from women, is added to the comparison.
If you have a measured maximum, from an exercise test or repeated all-out efforts with a chest strap, enter it. It replaces the estimates.
How the Formulas Compare
| Formula | Equation | Where it came from |
|---|---|---|
| Tanaka (2001) | 208 − 0.7 × age | Meta-analysis of 351 studies, 18,712 people |
| Gellish (2007) | 207 − 0.7 × age | Same people followed over years |
| HUNT (2013) | 211 − 0.64 × age | Norwegian population study, 3,320 adults |
| Gulati (2010) | 206 − 0.88 × age | Over 5,000 women |
| Fox (1971) | 220 − age | A line drawn by eye through about ten data sets |
Tanaka is the default. It rests on the most data and was confirmed in a laboratory study afterwards.
Step-by-Step Example
Age 50, female.
Tanaka: 208 − 0.7 × 50 = 173
Gellish: 207 − 0.7 × 50 = 172
HUNT: 211 − 0.64 × 50 = 179
220 − age: 220 − 50 = 170
Gulati: 206 − 0.88 × 50 = 162The best estimate is about 173. But the likely range matters more:
Most people (about 2 in 3): 173 ± 10 = 163 to 183
Nearly all (about 19 in 20): 173 ± 20 = 153 to 193Every formula on the list — including Gulati's 162 — sits inside the range where most 50-year-olds actually are.
The Trouble With 220 − Age
It is the formula everyone knows, and it has the thinnest foundation.
It is usually credited to Fox and Haskell in 1971, who plotted results from around ten earlier studies and drew a line through them. They did not present it as a formula for individuals, and it was never tested as one.
Compared with Tanaka, it runs high below 40 and low above it. The two lines cross at exactly one age:
220 − a = 208 − 0.7a → 0.3a = 12 → a = 40At 20 it gives 200 against Tanaka's 194; at 70 it gives 150 against 159. Those gaps are real, but still smaller than the individual scatter — which is the larger point.
Women and Maximum Heart Rate
In Gulati's data from over 5,000 women, maximum heart rate fell faster with age: 0.88 beats a year rather than 0.7. The two formulas are close for young women and diverge later.
Age 30: Tanaka 187, Gulati 180 (7 lower)
Age 50: Tanaka 173, Gulati 162 (11 lower)
Age 70: Tanaka 159, Gulati 144 (15 lower)It is offered alongside the general formulas rather than replacing them, since the general formulas were built from mixed groups that included women.
What Changes Maximum Heart Rate — and What Does Not
Age lowers it, by roughly 0.7 beats a year on average.
Genes account for much of the scatter between people of the same age.
Fitness barely moves it. This surprises people. Training lowers your resting rate and lets you do more work at a given rate, but your ceiling stays close to where it was. A fit 50-year-old and an unfit one have similar maximums.
Some medicines, notably beta blockers, lower it considerably, and age formulas do not apply to people taking them.
Measuring Your Own Maximum
If you train by heart rate seriously, a measured maximum is worth more than any formula, and it is less daunting to find than it sounds.
The reliable way is a graded exercise test, supervised in a clinic or sports lab, where the workload rises every minute or two until you cannot continue.
The practical way is a chest strap and a hard session. After a thorough warm-up, run or cycle up a steady hill hard for two to three minutes, recover briefly, and repeat, finishing the last effort flat out. The highest reading across the session, repeated on another day, is a good working figure.
Take the highest number you see reliably, not a single spike. Optical wrist sensors can lock on to your cadence rather than your pulse during hard efforts, so treat an implausible reading with suspicion.
Understanding Your Result
Maximum heart rate is Tanaka's estimate, or your measured figure if you entered one.
Where most people your age fall gives the ±10 and ±20 bpm ranges around the estimate.
Every formula lists all five (or four, for men) with the arithmetic for your age.
Worth knowing compares 220 − age or Gulati's formula with Tanaka, or explains how to use a measured figure.
When Should You Use This Calculator?
Before setting heart rate training zones, which all depend on the maximum.
When a watch's default zones feel wrong, to see how far off an estimate can be.
To decide whether measuring your maximum is worth it. If you train by heart rate seriously, it usually is.
Not as a safety limit. Reaching your maximum briefly is normal for healthy, trained people.
Common Mistakes
Treating 220 − age as the standard. It is the weakest of the formulas here.
Treating any estimate as precise. One in three people are more than 10 beats from it.
Expecting it to rise with fitness. Resting rate falls; maximum stays put.
Using a wrist sensor reading as your maximum. Optical sensors lag and misread during hard, jerky efforts; a chest strap is more reliable.
Testing a maximum without preparation. An all-out effort is hard on the heart if you are unused to it.
If you have a heart condition, take heart-rate-lowering medicine, or have been inactive, get medical advice before any maximal effort. Nothing here is medical advice.