Karvonen Target Heart Rate: Age 25, RHR 55, 80% Intensity
A 25-year-old with a resting heart rate of 55 bpm training at 80% intensity has a target heart rate of approximately 172 bpm.
How to use this tool
- Enter age, resting heart rate and training intensity in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your target heart rate and the full breakdown beneath it.
Calculate your high-intensity training zone heart rate using the Karvonen formula at age 25.
Frequently asked questions
- What is heart rate reserve?
- HRR = Maximum HR − Resting HR. It represents the range of heart rates available for exercise. A higher HRR (lower resting HR) generally indicates better cardiovascular fitness.
- How is this different from the simple percentage method?
- Simple method: THR = MHR × intensity%. Karvonen: THR = (MHR − RHR) × intensity% + RHR. Karvonen gives higher target HRs at the same percentage because it accounts for resting heart rate.