Heart Rate Reserve Calculator
Karvonen Method
Formula
THR = ((HRmax − HRrest) × %intensity) + HRrest, where HRmax = 220 − age.
Frequently Asked Questions
What is the Karvonen formula?
The Karvonen formula calculates target heart rate as THR = ((HRmax − HRrest) × intensity%) + HRrest. It uses heart rate reserve (the difference between max and resting HR) for a more individualized training target.
What is heart rate reserve?
Heart rate reserve (HRR) is the difference between your maximum heart rate and your resting heart rate. It represents the range within which your heart can increase its rate during exercise.
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