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Fat Burning Zone Calculator

Calculate your fat burning zone based on age and resting heart rate using the Karvonen method

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๐Ÿ‡ฉ๐Ÿ‡ฐ All calculations are based on Danish rules, rates, and currency (DKK). This calculator is translated for convenience but applies exclusively to Denmark.

Calculate your fat burning zone

The fat burning zone is the heart rate range where your body primarily uses fat as fuel during exercise. This zone typically lies between 60-70% of your heart rate reserve (Karvonen method). Training in this zone is ideal for longer, moderate exercise sessions.

What is the fat burning zone?

At low to moderate intensity (60-70% of heart rate reserve), the body draws most of its energy from fat stores. At higher intensity, the body switches to carbohydrates as the primary energy source because fat cannot be metabolised fast enough. Therefore, this zone is optimal for maximising fat burning during exercise.

Karvonen method for fat burning

The Karvonen method is more accurate than simple percentage calculations because it includes your resting heart rate. The formula is: HR = (Max HR โˆ’ Resting HR) ร— Intensity% + Resting HR. For a 30-year-old with a resting heart rate of 60, this gives a fat burning zone of about 136-149 bpm.

The fat burning zone myth

Although the body uses relatively more fat at lower intensity, you burn more total calories at higher intensity. For overall weight loss, calorie balance is more important than hitting a specific heart rate zone. Combine moderate zone 2 training with shorter high-intensity intervals for the best results.

Frequently Asked Questions

Is the fat burning zone the best zone for weight loss?

Not necessarily. Although the body uses more fat percentagewise in the fat burning zone, you burn more total calories at higher intensity. For weight loss, overall calorie balance is most important. A combination of moderate and high intensity typically gives the best results.

How long should I train in the fat burning zone?

For optimal fat burning, at least 30-60 minutes of training in the fat burning zone is recommended. Fat burning increases after about 20 minutes when glycogen stores begin to deplete. Health authorities recommend at least 150 minutes of moderate exercise per week.

Does my resting heart rate affect the fat burning zone?

Yes, with the Karvonen method your resting heart rate directly affects your calculated heart rate zones. A person with a lower resting heart rate (better fitness) will have a wider training zone. Therefore, knowing your actual resting heart rate is important for calculating accurate zones.

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