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Target Heart Rate Estimator

The Target Heart Rate Estimator calculates a training range from age, resting heart rate, and selected exercise intensity. It uses the heart-rate reserve method, which adjusts the target for an individual’s resting pulse instead of relying only on a percentage of estimated maximum heart rate. The result can provide a practical reference for steady aerobic sessions.

Maximum heart rate equations are population estimates and can differ substantially from an individual’s measured maximum. Medications, illness, heat, dehydration, pregnancy, and cardiovascular conditions may also change an appropriate training response. Use perceived exertion and professional guidance alongside the displayed range, especially when beginning exercise or managing a medical condition.

Enter your values

years
bpm
%
%
Result
—
Estimated training heart-rate range
Estimated maximum HR—
Heart-rate reserve—
Target range width—

1. Enter age

Age is used to estimate maximum heart rate with a population equation.

2. Measure resting heart rate

Use a calm, rested reading, ideally taken before significant activity or caffeine.

3. Choose lower intensity

Select the bottom of the desired aerobic effort range.

4. Choose upper intensity

Set an upper percentage that is at least as high as the lower value.

5. Review the range

Use the range as a guide and compare it with breathing, talk test, and perceived exertion.

6. Adjust cautiously

Stop exercise and seek appropriate help if symptoms such as chest pain, faintness, or unusual shortness of breath occur.

Target HR = [(Estimated max HR − Resting HR) × Intensity] + Resting HR

Estimated max HR = 208 − 0.7 × age. The lower and upper intensity percentages are applied separately to create the range. This is an estimate, not a diagnostic threshold.

What the result means

Estimated training heart-rate range based on the values entered.

Review the stated assumptions before using the estimate for a decision.

Given: age 35, resting heart rate 65 bpm, intensity range 60%–75%.

Calculation: Estimated max = 208−0.7×35 = 183.5 bpm. Reserve = 183.5−65 = 118.5. Lower = 118.5×0.60+65 = 136.1. Upper = 118.5×0.75+65 = 153.9.

Result: The estimated target range is 136–154 bpm.

Why use resting heart rate?

Including resting heart rate personalizes the calculation through heart-rate reserve and often gives a different range than a simple percentage of maximum.

How should resting heart rate be measured?

Measure after several minutes of quiet rest and use a typical value rather than an unusually high or low reading.

Can medications change the target?

Yes. Some medications alter heart-rate response. A clinician may recommend a different method such as perceived exertion.

Is the estimated maximum heart rate exact?

No. Individual maximum heart rate can vary meaningfully from age-based equations.

What if my heart rate leaves the range?

Brief variation is not automatically dangerous, but symptoms and personal medical advice matter more than a generic estimate.