Karvonen Heart Rate Zones

1. Enter Max heart rate, Resting heart rate.
2. Check the estimate in the result area.
3. Share a reproducible URL if needed.

• Read Target zones, Heart-rate reserve as quick decision-making estimates.
• Do not treat the result as a fixed answer; adjust assumptions to see the range when needed.

• Useful when you want to set heart-rate training ranges; adjust inputs to compare scenarios.
• Useful when you want to use resting heart rate in zone estimates; adjust inputs to compare scenarios.
• Use results as training guides and adjust for condition, heat, surface, and fatigue.
• If the result feels too demanding, reduce distance, intensity, or duration and recalculate.

Calculates heart-rate reserve from max and resting heart rate, then shows Karvonen target zones.

• Adjust for your condition and environment.
• This is not medical or coaching advice.
• Stop exercising if you feel pain or discomfort.