What maximum heart rate is, and isn't
Maximum heart rate (HRmax) is the highest beats per minute your heart reaches at maximal exertion. It is largely genetic, falls slowly with age, and is not a fitness marker. You cannot train it higher. A 10-bpm error shifts every zone by 5–10 bpm.
Why we show six formulas, not one
220 − age (Fox & Haskell, 1971) was never derived from rigorous data and over-predicts in older athletes. Tanaka et al. (2001) re-derived it from 18,712 subjects: 208 − 0.7 × age, now the most cited. Gellish (207 − 0.7 × age), Nes (211 − 0.64 × age) and Londeree & Moeschberger (206.3 − 0.711 × age) refine it. Gulati (206 − 0.88 × age), from 5,437 women, predicts lower.
Limitations and when to test for real
Every age formula has a standard deviation of about ±10–12 bpm, so one in three people sits more than 10 bpm off. A field test beats any formula, and HRmax drifts down only 0.7 bpm per year, so one test lasts years. Beta-blockers lower HRmax substantially.
How to test your true maximum heart rate
Rested, healthy, fully warmed up. This is a maximal effort. Stop if you feel unwell.
- 1
Warm up fully
10–15 minutes easy, then a few rising surges.
- 2
Find a long hill
One that takes 2–3 minutes to climb hard.
- 3
Climb hard three times
Controlled, recover on the descent, harder each time.
- 4
Sprint the final climb
All-out over the last 30 seconds. The highest reading is your HRmax.
Worked example
A 35-year-old male athlete compares the formulas:
| Fox / Haskell (220 − age) | 185 bpm |
| Tanaka (208 − 0.7·age) | 184 bpm |
| Nes (211 − 0.64·age) | 189 bpm |
| Spread across all six | ≈ 180–189 bpm |
A 9-bpm spread. A hill-repeat test resolves it.
Frequently asked questions
Is 220 minus age accurate?
220 − age is not very accurate. It was never properly validated and over-predicts maximum heart rate in older athletes. Tanaka's 208 − 0.7 × age is better, but every formula carries a ±10–12 bpm error. Test instead.
Does a higher max heart rate mean I'm fitter?
No. Maximum heart rate is mostly genetic and not a fitness marker. Two equally fit athletes of the same age can differ by 20 bpm. Fitness shows as a lower resting heart rate and more pace at the same heart rate.
Why is the women's formula different?
Most heart-rate formulas were derived largely from men. Gulati et al. (2010) studied 5,437 women and found 206 − 0.88 × age predicts their maximum heart rate better, and lower, than unisex equations.
How often should I retest my maximum heart rate?
Rarely. Maximum heart rate declines about 0.7 beats per minute per year, so one field test stays valid for years. Retest after a long layoff, a change in altitude, or when heart-rate data stops matching effort.
Sources
- Tanaka, Monahan & Seals (2001). “Age-predicted maximal heart rate revisited.” J Am Coll Cardiol 37(1):153–156.
- Gulati et al. (2010). “Heart rate response to exercise stress testing in asymptomatic women.” Circulation 122:130–137.
- Fox & Haskell (1971). Origin of the 220 − age approximation.