What is heart rate reserve?

HRR is the difference between your maximum heart rate and resting heart rate. It represents the functional range available for exercise and is used to calculate Karvonen training zones.

How do I measure resting heart rate accurately?

Measure resting heart rate in the morning before getting out of bed, after at least 5 minutes of lying still. Average readings over 3-5 days for best accuracy.

Why does HRR matter for training?

Using HRR-based zones (Karvonen method) accounts for individual fitness level. Two people with the same HRmax but different fitness will have different resting HRs and therefore different training zones.

Heart Rate Reserve (HRR) Calculator

Calculate Heart Rate Reserve: HRR = HRmax - HRrest. Used in the Karvonen method to set personalized training zones.

Use the full interactive calculator below, or

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Frequently Asked Questions

What is heart rate reserve?

How do I measure resting heart rate accurately?

Why does HRR matter for training?