Target Heart Rate Zone Calculator
The Karvonen formula (Heart Rate Reserve method) provides more accurate target heart rate zones than raw percentage of max HR by accounting for individual resting heart rate.
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📐 Formula
💡 Practical Example
Age 30, resting HR 65 bpm: Max HR = 190 bpm. Aerobic zone (70-80%): Target = 65 + (190-65)×0.70 to 0.80 = 152-165 bpm.
📖 About Target Heart Rate Zone Calculator
The Karvonen formula (Heart Rate Reserve method) provides more accurate target heart rate zones than raw percentage of max HR by accounting for individual resting heart rate. Lower resting HR indicates better cardiovascular fitness.
To use the Target Heart Rate Zone Calculator, enter your Age, Resting Heart Rate (morning HR), Exercise Intensity Zone. The calculator instantly computes Estimated Maximum Heart Rate, Target Heart Rate (Low) and more. Results update in real time as you change any input — no submit button needed.
How to Use This Calculator
Enter your Age (e.g. 30 in years), Resting Heart Rate (morning HR) (e.g. 65 in bpm), and Exercise Intensity Zone — select from Warm-Up Zone (50-60% HRmax), Fat Burn Zone (60-70% HRmax), Aerobic / Moderate (70-80% HRmax). Results update instantly — no submit button needed. Use metric or imperial units as labeled. For the most accurate result, measure height and weight in the morning without shoes.
The Formula
Max HR = 220 - Age
Karvonen Formula: Target HR = Resting HR + (Max HR - Resting HR) × Intensity %
Zones: Fat Burn 60-70% | Aerobic 70-80% | Anaerobic 80-90%
Worked Example
Age 30, resting HR 65 bpm: Max HR = 190 bpm. Aerobic zone (70-80%): Target = 65 + (190-65)×0.70 to 0.80 = 152-165 bpm.
Understanding Your Result
The 220 – age formula for maximum heart rate (MHR) has a standard deviation of ±10–12 bpm — meaning actual MHR varies widely. Zone 2 training (60–70% MHR) builds aerobic base and fat oxidation efficiency. Zone 4–5 (80–95% MHR) builds VO2 max and lactate threshold but requires adequate recovery. Resting heart rate below 60 bpm is common in trained athletes; above 100 bpm at true rest (tachycardia) warrants medical evaluation if persistent.
💡 Expert Health Guidance & Clinical Context
- This calculator uses clinically validated formulas and population reference data published by the WHO and NIH. Results are screening estimates, not medical diagnoses.
- Consult a licensed healthcare provider before making any changes to diet, medication, or exercise based on these results — individual variation is significant.
- Genetics, chronic conditions, and concurrent medications can dramatically affect what a "normal" result means for a specific individual.
- Track your results over time: a single data point is less meaningful than a trend measured consistently across multiple weeks or months.
- The CDC recommends adults receive routine health screenings at least annually. Use these calculations to prepare informed questions for your physician.
- Body composition, lifestyle factors, and stress levels all interact with the metrics shown here. No single number captures your full health picture.
- For pediatric or geriatric populations, reference ranges may differ significantly from the adult standards used in general calculators.
- Always cross-reference results with laboratory tests, clinical examinations, and professional medical evaluation before acting on any finding.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.