Heart Rate Reserve Calculator
Calculate your Heart Rate Reserve (HRR) - the difference between your maximum and resting heart rates. This is used to determine target heart rate zones for exercise.
Heart Rate Reserve
Maximum Heart Rate
Target Heart Rate at % Intensity
Formula & Explanation
Maximum HR = 220 - Age
HRR = Maximum HR - Resting HR
Target HR = (HRR × Intensity%) + Resting HR
HRR = Maximum HR - Resting HR
Target HR = (HRR × Intensity%) + Resting HR
Heart Rate Reserve (HRR) represents your heart's capacity to increase its rate during exercise. The Karvonen Formula uses HRR to calculate target heart rate zones more accurately than simple percentage-of-maximum methods, as it accounts for individual fitness levels reflected in resting heart rate.
Note: This calculator provides estimates for general fitness guidance. Consult healthcare professionals for personalized exercise recommendations.