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Maximum Heart Rate (Tanaka) Calculator

Estimate HRmax from age with the Tanaka formula

How it is calculated

The tool applies HRmax = 208 − 0.7 × age, where age is in years and HRmax is the estimated maximum heart rate in beats per minute (bpm). The result is rounded to a whole number. Because the slope is 0.7, each extra year lowers the estimate by 0.7 bpm.

Only the age is used: sex, fitness level, medication and the sport you do are not considered. Ages must be above 0 and no more than 120, otherwise there is no result. The figure is a population average. Individual maximum heart rates can differ from it by many beats in either direction, so it is a planning estimate and not a measured value or medical advice.

Worked example

For a 45-year-old: 0.7 × 45 = 31.5. Subtract from 208: 208 − 31.5 = 176.5, which the tool rounds to 177 bpm. For comparison, the older rule 220 − age gives 175 bpm for the same person. A training zone at 80% of the Tanaka value would then be about 141 bpm (0.8 × 176.5 = 141.2).

Try this example →

Common mistakes

  • Treating the result as an exact limit; it is an average estimate, and your real maximum may be well above or below it.
  • Mixing it up with the older 220 − age rule and comparing numbers from the two formulas as if they were the same measurement.
  • Using the estimate in place of a stress test when there are heart or health concerns; the tool cannot judge whether intense exercise is safe for you.
  • Setting zones from your resting heart rate alone; percentages of HRmax and heart-rate-reserve methods give different zone boundaries.
  • Entering age in months or a birth year such as 1980; the field takes age in years.

About this calculator

This calculator uses the Tanaka formula, HRmax = 208 − 0.7 × age, published by Tanaka, Monahan, and Seals in 2001 after pooling data from over 18,000 subjects — a meta-analysis-backed replacement for the old rule-of-thumb 220 − age, which was never based on a rigorous study and tends to underestimate HRmax in older adults.

Personal trainers, cardiac rehab programs, and fitness apps use HRmax as the anchor for setting heart-rate training zones (fat-burn, aerobic, threshold, and VO2max zones are all defined as percentages of it), so a more accurate HRmax estimate directly translates into more accurate, individualized training targets.

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Comments (1)

  • Editorial team

    Treat the number as a starting point for planning, not a ceiling. A 45-year-old gets about 177 bpm, yet two adults of that age can differ by many beats. If you want a real figure, a supervised maximal test is the reliable route; a watch reading from a hard effort is only a rough check. Which zone method do you use with your maximum, percent of HRmax or heart-rate reserve?

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