Movement
Heart Rate Reserve Calculator
Separate the reserve calculation from the selected intensity used to produce one planning target.
Add source values for heart rate reserve
Entries used for heart rate reserve
The form asks for measured or selected maximum heart rate, resting heart rate, selected reserve intensity because each has a defined role in this particular method. Copy measured or labeled values rather than estimating extra precision.
- Measured or selected maximum heart rate: Enter a measured value or a clearly identified estimate.
- Resting heart rate: Use a resting reading taken under consistent conditions.
- Selected reserve intensity: Choose the percentage of heart-rate reserve to apply.
What is being calculated for heart rate reserve
Separate the reserve calculation from the selected intensity used to produce one planning target.
Checking the heart rate reserve equation with an example
With the demonstration entries—Measured or selected maximum heart rate 185 bpm, Resting heart rate 65 bpm, Selected reserve intensity 60%—the calculator evaluates the displayed equation. Replace every example value with values from the same case before relying on the arithmetic.
A useful heart rate reserve comparison holds every entry constant except the value being examined.
How the Karvonen heart-rate-reserve arithmetic works
The result panel reports heart rate reserve, reserve-method target, resting share of maximum. It does not silently supply a missing clinical value, unit conversion, or population assumption.
What heart rate reserve cannot establish
Maximum heart rate must exceed resting heart rate for the reserve concept to be meaningful. Medication, illness, testing method, and cardiovascular conditions can alter exercise response.
Record when the heart rate reserve inputs were obtained and which assumptions were selected before comparing another run.
This method stops here; five reserve zones begins from a different definition.
Questions raised by heart rate reserve
What does the heart rate reserve result actually represent?
It represents heart rate reserve, reserve-method target, resting share of maximum produced by the Karvonen heart-rate-reserve arithmetic from the values entered on this page.
Why might another calculator give a different answer?
Differences in heart rate reserve often come from unit conventions, equation choice, reference data, or rounding rather than a malfunction.
Can this result make a health or treatment decision?
No. Maximum heart rate must exceed resting heart rate for the reserve concept to be meaningful. Medication, illness, testing method, and cardiovascular conditions can alter exercise response.
From calculation to record for heart rate reserve
Treat heart rate reserve, reserve-method target, resting share of maximum as one line in a record, not as a complete assessment. Add the date, circumstances, and reason for performing the calculation. A result without those details is difficult to reproduce and easy to misread.
The most useful follow-up is often another measurement made consistently, not another formula applied to the same uncertain input. When a decision has health consequences, confirm that Karvonen heart-rate-reserve arithmetic is the method that decision actually calls for.
Measured and estimated maxima are not interchangeable
Heart-rate reserve subtracts resting heart rate from the maximum value entered. Label that maximum as measured or estimated in any saved record.
The selected intensity is then applied to the reserve and resting heart rate is added back. This is why a reserve-method target differs from simply multiplying maximum heart rate by the same percentage.