Heart Rate Zone Calculator
Calculate your five heart rate training zones based on your age and resting heart rate. Uses the Karvonen formula for personalized zones. All calculations happen client-side.
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How to Use the Heart Rate Zone Calculator
- Enter your age to calculate max heart rate (220 - age).
- Optionally enter your resting heart rate for Karvonen formula accuracy.
- View your 5 training zones with BPM ranges and descriptions.
- Use the zones to guide your cardio training intensity.
The 5 Training Zones
- Zone 1 (50-60%): Recovery and warm-up
- Zone 2 (60-70%): Fat burning and endurance
- Zone 3 (70-80%): Aerobic fitness
- Zone 4 (80-90%): Anaerobic threshold
- Zone 5 (90-100%): VO2 max and peak performance
Features
- Karvonen formula with resting heart rate
- Standard max HR percentage fallback
- Color-coded zone visualization
- Zone descriptions and training benefits
- One-click copy results to clipboard
- 100% client-side -- no data sent to any server
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Disclaimer: This tool is provided as-is for informational and educational purposes only.