The Diet Heart Rate Estimator calculates age-based exercise heart-rate zones that can be used to pace cardio sessions within a diet and fitness program. It shows an estimated maximum heart rate plus moderate and vigorous ranges, helping users compare a wearable reading with a simple intensity guide.
The estimate uses the common 220-minus-age equation and percentage ranges published by the American Heart Association. These numbers are averages, not diagnostic limits. Fitness level, temperature, dehydration, stress, medication, and heart conditions can change the response to exercise.
Age drives the maximum-heart-rate estimate.
Measure it while relaxed; this is used only for the heart-rate-reserve option.
Percent of maximum is simpler. Heart-rate reserve also accounts for resting heart rate.
Choose the percentage you want to examine.
Use the moderate and vigorous ranges as broad guides, not rigid limits.
Where:
Assumptions: The American Heart Association describes moderate activity as roughly 50%–70% and vigorous activity as roughly 70%–85% of estimated maximum heart rate. The values are averages.
The result estimates the heart rate associated with the selected intensity.
Do not use this estimate to diagnose a condition or override individualized medical advice.
Given:
Calculation:
Maximum = 220 − 35 = 185 bpm. Custom target = 185 × 0.65 = 120.25 bpm. Moderate zone = 92.5–129.5 bpm. Vigorous zone = 129.5–157.25 bpm.
Result: 120 bpm custom target.
A reading near 120 bpm corresponds to the selected 65% intensity under this age-based model.
No. It is a population-level estimate and individual maximum heart rate can differ.
Percent of maximum is easy to use; heart-rate reserve can better reflect differences in resting heart rate.
Yes. Some medicines alter heart-rate response, so a clinician may recommend a different target.
Reduce intensity and use perceived effort or the talk test. Stop exercise and seek care for concerning symptoms.
No. Heart rate indicates exercise intensity; calorie expenditure also depends on body size, duration, and activity type.