Heart Rate Zone Calculator

What is the Heart Rate Zone Calculator?

Find your maximum heart rate and five training zones using the Karvonen method. The Karvonen method uses your resting heart rate as well as age, so training zones reflect your fitness rather than age alone.

How to use the Heart Rate Zone Calculator

1. Enter your age, your resting heart rate.
2. Results update automatically as you type; you can also press Calculate.
3. Read the output: estimated max heart rate, training zones.
4. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

Worked example

With age = 35 years, resting heart rate = 62 bpm, the Heart Rate Zone Calculator returns estimated max heart rate: 184 bpm.

Where the Heart Rate Zone Calculator helps in real life

You are training for a half marathon and your easy runs keep turning into hard ones. The zones give a target heart-rate range that keeps recovery days genuinely easy.

After six months of training your resting heart rate has dropped from 70 to 58. Recalculating shows how your zones have shifted with your improved fitness.

Common mistakes to avoid

• Using the 220 − age shortcut without accounting for individual differences.
• Measuring resting heart rate right after coffee or activity.
• Ignoring medication, such as beta blockers, that changes heart rate.
• Running easy days in a high zone and hard days too easy.

💡 Practical tip: If you have a heart condition or take heart medication, ask your doctor before training by heart-rate zones.

Tips for better results

• Measure resting heart rate in bed just after waking, for several mornings.
• Recalculate your zones every few months as fitness changes.
• Use zones together with how hard the effort feels.

⚠️ This tool provides general information and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified healthcare professional.

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