Target Heart Rate Calculator - Karvonen Training Zones
Free online target heart rate calculator. Calculate your 5 cardiovascular training zones (Fat Burn, Aerobic, Anaerobic) using the Karvonen formula.
Inputs
🔒 Local Processing| Zone | Intensity | Target BPM Range | Primary Training Benefit |
|---|---|---|---|
| Zone 1 | 50% - 60% | 127 - 139 BPM | Active Recovery & Warmup |
| Zone 2 | 60% - 70% | 139 - 151 BPM | Fat Burning & Endurance |
| Zone 3 | 70% - 80% | 151 - 163 BPM | Aerobic Fitness & Stamina |
| Zone 4 | 80% - 90% | 163 - 176 BPM | Anaerobic Power & Speed |
| Zone 5 | 90% - 100% | 176 - 188 BPM | Peak Performance / Sprint |
How to Use This Calculator
- Enter age and morning resting heart rate to generate your 5 personalized training zones.
Formula & Mathematical Method
Accounts for individual cardiovascular fitness via Heart Rate Reserve (HRR).
Target HR = Resting HR + (HRmax - Resting HR) × Intensity %Explanation of Variables
| Symbol | Variable Name | Description & Role in Calculation |
|---|---|---|
| HRR | Heart Rate Reserve | Difference between max heart rate and resting heart rate. |
Worked Calculation Examples
28-year-old with 65 BPM resting
Scenario: Aerobic zone.
Interpretation of Results
Health and metabolic metrics are calculated using validated empirical equations (such as Mifflin-St Jeor, Devine, or Boer formulations). Results provide statistical estimates of physiological parameters for general wellness planning.
Estimated Physiological Value
Your calculated metabolic or anthropometric metric based on standard demographic averages.
Key Context: Use this figure as an informational baseline for nutritional or fitness goal setting.
Practical Use Cases
Nutritional and Fitness Program Design
Establish structured dietary intake targets, hydration goals, or training heart rate zones.
Long-Term Wellness Progress Tracking
Monitor changes in body composition, cardiovascular recovery, or metabolic requirements over time.
Limitations & Key Assumptions
- Formulas are derived from population-level clinical studies and cannot account for unique genetic, endocrine, or pharmacological differences.
- Hydration, body fat, and calorie needs fluctuate with daily temperature, humidity, stress, and hormonal cycles.
- Calculations are informational estimates and are NOT medical diagnoses, clinical evaluations, or therapeutic advice. Consult a qualified healthcare professional.