Heart Rate Zone Calculator
Find your maximum heart rate and the five training zones that help you exercise at the right intensity for fat burning, endurance and performance.
What are heart rate training zones?
Heart rate training zones are ranges of intensity, expressed as a percentage of your maximum heart rate, that correspond to different fitness benefits. Exercising in a lower zone builds an aerobic base and burns fat, while higher zones improve cardiovascular fitness and performance. By training in the right zone for your goal, you make your workouts more effective and avoid overtraining. This calculator estimates your maximum heart rate from your age and divides it into five practical zones.
How maximum heart rate is calculated
Your maximum heart rate is the highest number of times your heart can beat per minute during all-out effort. This tool uses the Tanaka formula — 208 minus 0.7 times your age — which research has shown to be more accurate across age groups than the older 220-minus-age rule. For example, a 40-year-old has an estimated maximum of about 180 beats per minute. Remember this is an estimate; individual maximum heart rates vary, and a supervised exercise test gives the most precise value.
Using the five zones
Zone 1 (50–60%) is very light, ideal for warm-ups and recovery. Zone 2 (60–70%) is the classic fat-burning and endurance-building zone where you can still hold a conversation. Zone 3 (70–80%) improves aerobic capacity. Zone 4 (80–90%) is hard, anaerobic work that boosts speed and power. Zone 5 (90–100%) is maximum effort, sustainable only in short bursts. A balanced programme spends most time in zones 2 and 3, with shorter sessions in the higher zones.
Training safely with heart rate
Heart rate training is a powerful tool, but listen to your body alongside the numbers. If you are new to exercise, have a heart condition, are pregnant, or take medication that affects heart rate (such as beta-blockers), speak to your doctor before training at higher intensities — medications can change your heart rate response and make these estimates inaccurate. Build intensity gradually, stay hydrated, and stop if you feel chest pain, severe breathlessness or dizziness.
Frequently Asked Questions
The fat-burning zone is generally Zone 2, around 60 to 70% of your maximum heart rate. At this moderate intensity your body uses a higher proportion of fat for fuel, and you can sustain the effort for longer. That said, higher-intensity exercise burns more total calories, so the best approach combines both.
Related Tools
Target Heart Rate Calculator (Karvonen)
Calculate personalised target heart rate zones using the Karvonen method, which factors in your resting heart rate for more accurate training intensities
Resting Heart Rate Checker
Find out what your resting heart rate says about your cardiovascular health and fitness
Daily Calorie Calculator (TDEE)
Calculate how many calories you need each day to maintain, lose or gain weight
BMI Calculator
Calculate your Body Mass Index (BMI) to understand whether your weight is healthy for your height
Sources & References
- 1.Tanaka H, Monahan KD, Seals DR.. Age-predicted maximal heart rate revisited. Journal of the American College of Cardiology.
- 2.American Heart Association. Target Heart Rates Chart.
- 3.American College of Sports Medicine. Guidelines for Exercise Testing and Prescription.
LifeCheckIQ content is based on peer-reviewed research, recognised clinical guidelines, and authoritative medical sources, and is reviewed by Deborah Adotso, General Nurse, for clinical accuracy.
Medical Disclaimer: This tool is for informational and educational purposes only. Results are not a medical diagnosis. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment. In an emergency, call your local emergency number or visit the nearest hospital immediately.