Target Heart Rate (Clinical) Calculator
Calculate target heart rate using the Karvonen formula with heart rate reserve. Includes all five training zones.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Target Heart Rate (Karvonen)
130 bpm
How to Use This Calculator
- Enter patient age and resting heart rate (bpm).
- Set target exercise intensity as a percentage of heart rate reserve (HRR).
- Review Target HR (Karvonen), HRmax by Fox and Tanaka formulas, HR Reserve, and HR Zones.
- Use Zone 3 aerobic range (70–80% HRR) for standard cardiac rehab exercise prescription.
How the result changes with Target intensity
| Target intensity | Target Heart Rate (Karvonen) |
|---|---|
| 10 | 80 bpm |
| 35 | 105 bpm |
| 65 | 135 bpm |
| 90 | 160 bpm |
What each input means
- Age
- Patient age in years for HRmax estimation.
- Resting heart rate
- Resting heart rate measured after 5 minutes of seated rest.
- Target intensity
- Desired exercise intensity as % of heart rate reserve (HRR).
What each result means
- Target Heart Rate (Karvonen)
- THR = ((HRmax - HRrest) × intensity%) + HRrest.
- HRmax (Fox: 220 - age)
- Age-predicted maximum heart rate (Fox formula).
- HRmax (Tanaka: 208 - 0.7×age)
- Tanaka formula, more accurate for older adults.
- Heart Rate Reserve
- HRmax - resting HR. The working range for exercise prescription.
- Target HR (%HRmax method)
- Simpler %HRmax method for comparison. Less accurate than Karvonen.
- Aerobic Zone (70-80% HRR)
- Zone 3 lower bound. Typical cardiac rehab target zone.
- Aerobic Zone Upper
- Zone 3 upper bound.
How this is calculated
Worked example, using the default values
- Identify Input ParametersAge = 50, Resting heart rate = 70, Target intensity = 60 = 3 input(s) provided
- Calculate Target Heart RateTarget Heart Rate = hrReserve * (targetIntensity / 100) + restingHR130 = 130
- Calculate HRmaxHRmax170 = 170
- Calculate HRmaxHRmax173 = 173
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