Heart Rate Zone Calculator
Calculate your target heart rate zones for fat burn, cardio, and peak training based on age. Optimise your workout intensity. Free heart rate calculator.
What is Heart Rate Zone Calculator?
The Heart Rate Calculator determines your maximum heart rate and target heart rate zones for different exercise intensities — fat burn zone, cardio zone, and peak zone — helping you train at the right intensity for your fitness goals.
Should I use this during pregnancy?
Pregnancy-related calculators provide general estimates. Always follow your gynecologist's specific guidance, as individual pregnancy journeys vary significantly.
How to Calculate Target Heart Rate
- Enter your age in years
- Optionally enter your resting heart rate (for Karvonen formula)
- Click Calculate to see your maximum heart rate and training zones
How Heart Rate Zone Calculator is Calculated
Max Heart Rate (MHR) = 220 − Age. Fat Burn Zone = 50–70% of MHR. Cardio Zone = 70–85% of MHR. Peak Zone = 85–100% of MHR. Karvonen formula uses resting HR for more accuracy.
Worked Example
Age 30: MHR = 220 − 30 = 190 bpm. Fat Burn Zone = 95–133 bpm. Cardio Zone = 133–162 bpm. Peak Zone = 162–190 bpm. For optimal fat loss, aim for 130–150 bpm.
Common Use Cases
- Exercise intensity optimisation
- Fat burn vs cardio zone training
- Fitness progress monitoring
- Safe exercise intensity for beginners
Common Mistakes to Avoid
- Using the 220-age formula as exact — it is an estimate with a ±10–12 bpm variation. Your actual MHR may be higher or lower.
- Staying only in the "fat burn zone" for weight loss — the cardio zone actually burns more total calories per minute, even though a lower percentage comes from fat.
- Ignoring resting heart rate — the Karvonen formula using resting HR gives more personalised zones than the simple 220-age method.
- Comparing heart rate zones between people — zones are individual. Two 30-year-olds with different fitness levels will have very different effective training zones.
Frequently Asked Questions
What is a normal resting heart rate?
Normal resting heart rate for adults is 60–100 bpm. Athletes often have 40–60 bpm. Below 60 (in non-athletes) or above 100 at rest may warrant a medical check.
Which heart rate zone burns the most fat?
The "fat burn zone" (50–70% MHR) burns a higher percentage of fat, but the cardio zone (70–85%) burns more total calories. For weight loss, total calorie burn matters more.
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Why You Need This Calculator
Heart rate training zones are the most effective way to optimize cardiovascular exercise. Whether you're burning fat, building endurance, or improving VO2 max, each zone targets different physiological adaptations. Using the Karvonen formula (which factors in resting heart rate) gives more personalized zones than the simple 220-age method.
Calculator Features
- 5 heart rate training zones with descriptions
- Karvonen method using resting heart rate
- Maximum heart rate estimation
- Fat burning vs cardio zone comparison
- Custom zone creation for specific sports
- Recovery heart rate tracking
The Math Behind It
Max HR = 220 – Age. Karvonen: Target HR = [(Max HR – Resting HR) × %intensity] + Resting HR. Zones: 50-60% Recovery, 60-70% Fat Burn, 70-80% Cardio, 80-90% Anaerobic, 90-100% VO2 Max.
Calculation Example
Age 30, Resting HR 65. Max HR = 190. Fat burn zone (60-70%): Lower = (190-65)×0.6 + 65 = 140 bpm. Upper = (190-65)×0.7 + 65 = 153 bpm.
Quick Reference
Heart rate training zones for age 30
| Zone | %Max HR | Purpose | Age 30 (beats/min) |
|---|---|---|---|
| Recovery | 50-60% | Warm-up, cool-down | 95-114 |
| Fat Burn | 60-70% | Fat metabolism | 114-133 |
| Cardio | 70-80% | Aerobic fitness | 133-152 |
| Anaerobic | 80-90% | Speed, power | 152-171 |
| VO2 Max | 90-100% | Maximum effort | 171-190 |
Pro Tips & Expert Insights
- 💡 Fat burning zone (60-70% max HR) burns the highest percentage of fat calories — but total calorie burn is lower.
- 💡 For weight loss, the cardio zone (70-80%) is actually more effective due to higher total calorie burn.
- 💡 Measure resting heart rate first thing in the morning before getting out of bed.
- 💡 Lower resting heart rate generally indicates better cardiovascular fitness.
- 💡 If you can't talk during exercise, you're above the anaerobic threshold (80%+ zone).
Who Benefits From This?
Runners optimizing training, gym-goers maximizing workouts, cardiac rehab patients, and fitness coaches designing programs.
📚 Complete Guide Available
Want to learn more? Read our comprehensive guide with detailed explanations, real-world examples, expert analysis, and actionable tips.
Read: Heart Rate Zones Calculator: Optimize Your TrainingMedical disclaimer: This calculator provides general estimates and is not a substitute for professional medical advice, diagnosis, or treatment. Results may vary based on individual factors. Consult a healthcare professional for personalized guidance. See our full Disclaimer.
Methodology: Based on clinically validated formulas used in nutrition and medical research. See our Editorial Policy for how we validate content.
Maintained by: Sagar Sahni, Calc Labz | Review: formula checks, worked examples, and periodic updates
Need a correction? Contact us with the calculator name, your inputs, and the issue you found.
Last updated: April 2026