ConverterHub

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.

Was this helpful?

You can pick up to 3 reactions.

Comments (0)

  • Be the first to comment.

Popular calculators

Loan Calculator

Monthly payment, total interest and full amortization schedule.

Percentage Calculator

Percent change, percent of, and ratio calculations.

Discount Calculator

Calculate final price, savings, and discount amount.

BMI Calculator

Body mass index from height and weight (metric or imperial).

Age Calculator

Compute your exact age in years, months and days from a birth date.

Compound Interest Calculator

Calculate the final amount and interest earned with compounding.

All Calculators