Fat Burning Zone Calculator - Heart Rate by Age and Gender
Calculate your personalized fat burning zone based on age, gender, and weight, with workout plans and calorie burn analysis.
Medical Disclaimer
The health and fitness tools provided on this website are for informational and educational purposes only. The information contained herein is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. The results provided by these tools are estimates based on general formulas and may not apply to your specific situation. If you think you may have a medical emergency, immediately call your doctor or dial emergency services.
About the Fat Burning Zone Calculator
The Fat Burning Zone is the heart rate range during exercise where body fat is burned most efficiently. It is generally defined as 60-70% of maximum heart rate or calculated using the Karvonen formula (Heart Rate Reserve).
This calculator uses the Tanaka formula (208 - 0.7 x age) to estimate maximum heart rate, and the Karvonen method (resting HR + Heart Rate Reserve x intensity%) to calculate your personalized fat burning zone. It also includes the Gulati formula (206 - 0.88 x age) specifically for women.
Recommended input ranges: age 10-100 years, resting HR 30-120 bpm (normal range for adults 60-100 bpm), weight 30-200 kg. For more accurate results, measure your resting HR in the morning right after waking up.
Exercise in the fat burning zone is especially effective for beginners, achieving maximum fat oxidation with 30-60 minutes of continuous exercise. Although high-intensity exercise burns more total calories, prolonged low-intensity exercise in the fat burning zone may be more efficient for overall fat burning.
- Comparison of 3 max HR formulas (Fox, Tanaka, Gulati)
- Precise fat burning zone calculation based on Heart Rate Reserve (Karvonen)
- Visual chart of 5 heart rate zones
- Calorie burn estimation by zone (30/45/60 min)
- Personalized weekly workout plan based on goal
- Cardiovascular risk assessment
Frequently Asked Questions
How do I calculate my fat burning zone?
The fat burning zone is generally defined as 60-70% of your maximum heart rate. Estimate max HR with the Tanaka formula (208 - 0.7 x age) and use the Karvonen formula for more accuracy: resting HR + (max HR - resting HR) x 0.6~0.7. For example, for a 40-year-old with resting HR of 70 bpm: max HR = 208 - 0.7x40 = 180 bpm, Reserve = 180-70 = 110, Fat burning zone = 70 + 110x0.6 ~ 70 + 110x0.7 = 136-147 bpm.
What is the fat burning zone for my age?
The fat burning zone decreases with age as max HR declines. For age 20 it is approximately 114-133 bpm, age 30 is 108-126 bpm, age 40 is 101-118 bpm, age 50 is 95-111 bpm, age 60 is 88-103 bpm. However, there is significant individual variation, so it is recommended to use the Karvonen formula with your resting HR for a more accurate calculation.
Which heart rate zone is most effective for fat burning?
Zone 2 (60-70% of max HR) has the highest fat oxidation rate. In this zone, fat accounts for approximately 60-75% of total energy used. High-intensity exercise (Zone 4-5) burns more total calories but the fat proportion is only 20-30%. If your goal is fat loss, exercising in Zone 2 for 30-60 minutes is the most efficient option.
Is the fat burning zone a myth?
No, the fat burning zone is not a myth. Exercise physiology research confirms that fat oxidation peaks during moderate-intensity exercise (60-70% of max HR). However, the concept 'you should only exercise in the fat burning zone' is a misconception. High-intensity exercise has an EPOC effect (excess post-exercise oxygen consumption) that continues burning calories after your workout. The most effective combination is Zone 2 exercise plus high-intensity intervals.
Is 220 minus your age accurate?
The 220-age formula, proposed by Fox and colleagues in the 1970s, is the oldest estimate of max HR but can have an error margin of plus or minus 10-15 bpm. The Tanaka formula (208 - 0.7 x age), based on data from over 10,000 people, is more accurate. For women, the Gulati formula (206 - 0.88 x age) may be more appropriate. This calculator provides all three formulas for comparison.
What are the signs that your body is burning fat?
During exercise in the fat burning zone, you may experience: accelerated breathing but you can still hold a conversation (talk test), moderate sweating but not excessive, moderate fatigue after exercise, changes in appetite during or after exercise. Long-term signs of fat loss include: weight reduction, looser clothing, increased energy levels. The most objective indicator is using a heart rate monitor to stay within your target zone.
What is the best cardio for fat burning?
The most effective cardio exercises for fat burning are sustained and rhythmic activities: walking, jogging, cycling, swimming, elliptical machine, rowing machine. Research shows that running burns the most calories per hour, but beginners should start with walking. Any exercise that allows you to keep your HR in the fat burning zone is effective. The most important thing is to maintain your heart rate in the target zone for at least 30 minutes.