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Heart Rate Training Zones Calculator

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Result

Max HR180
Zone HR126
↗ Health

Heart Rate Training Zones Calculator — free online calculator.

Formula

Simple age-based estimate: predicted maximum heart rate = 220 − age (beats/min). Selected target rate = predicted maximum × entered percentage / 100. This is an approximate population heuristic and calculates one selected percentage, not physiological zone boundaries; it is not a clinical heart-rate limit or exercise prescription.
  • Heart Rate Training Zones Calculator calculates its result from Age, Zone percent (%). It uses the formula Calculated with the verified ST Calculator runtime.. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
  • The main inputs are Age, Zone percent. Enter them in the units and format shown in the calculator.
  • Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Heart Rate Training Zones

Inputs
  • Age: 40
  • Zone percent: 70 %

Using Age = 40, Zone percent (%) = 70, the calculated result is Max HR: 180 | Zone HR: 126.

Sample result: Calculating…

Frequently asked questions

What does the Heart Rate Training Zones calculate?

Heart Rate Training Zones Calculator — free online calculator.

Which values should I enter?

Enter Age, Zone percent using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Simple age-based estimate: predicted maximum heart rate = 220 − age (beats/min). Selected target rate = predicted maximum × entered percentage / 100. This is an approximate population heuristic and calculates one selected percentage, not physiological zone boundaries; it is not a clinical heart-rate limit or exercise prescription..

Why might my result differ from another source?

Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026