When to use this calculator
Estimate adult moderate and vigorous exercise heart-rate zones using the age-predicted maximum method. Age-predicted ranges are rough population guides, not personalised safe limits. Medication, heart conditions, fitness and temperature can change heart-rate responses. Seek professional guidance before using zones if you have health concerns; this tool does not provide exercise clearance.
Explore the heart-rate estimates calculators for other questions in this topic. For a related calculation, use the Bicycle Gear Development Calculator: Find distance travelled per complete crank revolution for a bicycle gear.
PUTTING IT INTO PRACTICE
Target Heart Rate: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Age in years (integer) | 40 |
| Result | Estimated maximum: 180 bpm Moderate estimate: 90–126 bpm Vigorous estimate: 126–153 bpm |
- Check the input labels and enter the example values above.
- Apply the relationship: Estimated maximum = 220 − age; moderate zone = 50–70%; vigorous zone = 70–85% of that maximum..
- The result is Estimated maximum: 180 bpm Moderate estimate: 90–126 bpm Vigorous estimate: 126–153 bpm , rounded for display.
How to interpret your result
Age-predicted ranges are rough population guides, not personalised safe limits. Medication, heart conditions, fitness and temperature can change heart-rate responses. Seek professional guidance before using zones if you have health concerns; this tool does not provide exercise clearance.
Estimated heart-rate zones are population guides rather than individual safety thresholds. Medication, health conditions and fitness affect responses. Use professional advice when deciding an appropriate exercise programme.
Frequently asked questions
Does an age formula measure my maximum heart rate?
No. It estimates a population average. It does not measure your personal maximum or establish exercise safety.
When is the target heart rate calculator useful?
Estimate adult moderate and vigorous exercise heart-rate zones using the age-predicted maximum method. Age-predicted ranges are rough population guides, not personalised safe limits. Medication, heart conditions, fitness and temperature can change heart-rate responses. Seek professional guidance before using zones if you have health concerns; this tool does not provide exercise clearance.
How do I use the target heart rate calculator?
Enter age in years (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Estimated maximum = 220 − age; moderate zone = 50–70%; vigorous zone = 70–85% of that maximum..
What should I check before using the result?
Age-predicted ranges are rough population guides, not personalised safe limits. Medication, heart conditions, fitness and temperature can change heart-rate responses. Seek professional guidance before using zones if you have health concerns; this tool does not provide exercise clearance.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see American Heart Association: target heart rates ↗. This is a topic reference, not an external review or endorsement of this tool.
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