Karvonen Target Heart Rate: Age 45, RHR 65, 85% Intensity
A 45-year-old with a resting heart rate of 65 bpm at 85% intensity has a target heart rate of approximately 159 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.
Find your high-intensity interval training heart rate target at age 45 using the Karvonen formula.
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.