Fat Burn Calculator

Optimal Heart Rate Zone for Maximum Fat Burning | Karvonen Formula

💡 Karvonen formula factors in your resting heart rate for a more personalized zone.
Optimal Fat Burning Zone (60-70% Intensity)
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beats per minute
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Very Light
50-60%
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🔥 FAT BURN
60-70%
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Cardio/Aerobic
70-80%
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Hard/Anaerobic
80-90%
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Maximum Effort
90-100%
🔥 What is the Fat Burning Zone?
Exercising at 60-70% of your maximum heart rate allows your body to use stored fat as the primary fuel source. At higher intensities, your body shifts to burning more carbohydrates. For optimal weight loss, aim to stay in this zone for 30-60 minutes, 3-5 times per week.

📖 How to Use This Fat Burn Calculator

1
Enter your age - Your age is used to calculate your maximum heart rate.
2
Enter your resting heart rate - Measure your pulse first thing in the morning for 60 seconds.
3
Choose your formula - Standard formula (220 - age) or more accurate Karvonen formula.
4
Click "Calculate" - Get your optimal fat burning heart rate zone and all 5 heart rate zones.

🔥 How Fat Burning Works During Exercise

Your body uses different energy sources depending on exercise intensity. At lower intensities (60-70% of max heart rate), your body primarily burns stored fat for energy. This is why this range is called the "fat burning zone." At higher intensities, your body shifts to burning more carbohydrates (glycogen) because it can be converted to energy faster.

❤️ Understanding Heart Rate Formulas

📊 The 5 Heart Rate Training Zones

💡 Tips for Maximum Fat Burning

❓ Frequently Asked Questions

What is the best heart rate for fat burning?
The optimal fat burning zone is 60-70% of your maximum heart rate. Use our calculator to find your personalized range.
Is the fat burning zone better than high-intensity cardio?
The fat burning zone burns a higher percentage of calories from fat, but high-intensity cardio burns more total calories. The best approach is to incorporate both.
How do I measure my resting heart rate?
Measure your pulse first thing in the morning before getting out of bed. Count beats for 60 seconds. Normal is 60-100 bpm.
Why does the Karvonen formula give different results?
The Karvonen formula accounts for your fitness level through resting heart rate, making it more personalized.
How long should I exercise in the fat burning zone?
For weight loss, aim for 30-60 minutes, 3-5 times per week. Beginners should start with 20-30 minutes.