Heart rate zones divide your max heart rate into 5 ranges (50-60%, 60-70%, 70-80%, 80-90%, 90-100%). Each zone targets different training adaptations: recovery, fat burn, aerobic fitness, anaerobic performance, and VO2 max.
Heart Rate Zone Calculator
Find your personalized training zones using the Karvonen method. Enter your age and resting heart rate to get 5 zones for recovery, fat burn, aerobic fitness, anaerobic work, and VO2 max.
Calculate Your Heart Rate Zones
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What Are Heart Rate Training Zones?
Heart rate zones divide your heart rate range into 5 intensity levels. Training in different zones produces different adaptations: recovery, endurance, aerobic fitness, anaerobic capacity, and maximum effort.
The Karvonen Method
Unlike simple percentage-of-max formulas, the Karvonen method uses your heart rate reserve (max HR − resting HR). Target HR = ((MaxHR − RestHR) × intensity%) + RestHR. This personalizes zones based on your fitness level.
The Fat Burning Zone Myth
Zone 2 (60–70%) burns a higher percentage of fat per calorie, but total fat loss depends on total calories burned. Higher intensity burns more total calories. For weight loss, focus on total energy expenditure and consistency.
How to Find Your Resting Heart Rate
Measure your pulse first thing in the morning before getting out of bed. Count beats for 60 seconds (or 15 seconds × 4). Average over several days. A lower resting HR generally indicates better cardiovascular fitness.
Which Max HR Formula to Use
Tanaka (208 − 0.7 × age) is the most accurate for most adults. Fox (220 − age) is simpler but tends to overestimate. Gulati (206 − 0.88 × age) is better for women. Lab testing is the gold standard.
Zone 2 Training for Fat Loss and Endurance
Zone 2 (60–70% of max HR) is where your body burns the highest percentage of fat as fuel. While higher-intensity zones burn more total calories per minute, Zone 2 is sustainable for longer sessions and builds your aerobic base. Most endurance coaches recommend spending 80% of training time in Zone 2. It improves mitochondrial density, capillary growth, and fat oxidation — adaptations that benefit both performance and body composition over time.
How to Train in Each Zone
Zone 1 (Recovery): Easy walking, light stretching — used for warm-up and cool-down. Zone 2 (Fat Burn): Brisk walking, easy jogging, cycling — conversational pace. Zone 3 (Aerobic): Tempo runs, moderate cycling — can speak in short sentences. Zone 4 (Anaerobic): Interval training, hill sprints — can only say a few words. Zone 5 (VO2 Max): All-out sprints, max effort intervals — unsustainable beyond 1–3 minutes.
Heart Rate Monitors: Chest Strap vs. Wrist
Chest strap monitors (like Polar H10) measure electrical signals from your heart and are the most accurate for real-time zone training. Optical wrist sensors (found in smartwatches) are convenient but can lag during high-intensity intervals and may be inaccurate during activities with wrist movement. For serious zone-based training, a chest strap provides the most reliable data. Wrist monitors are adequate for steady-state cardio and general tracking.
Nutrition for Zone-Based Training
Different training zones have different fuel demands. Zone 1–2 sessions primarily burn fat and don't require special fueling for sessions under 90 minutes. Zone 3–4 sessions rely more on glycogen — ensure adequate carbohydrate intake before and after. Zone 5 sessions are short but intense; a small carb-rich snack 30–60 minutes before can help performance. Post-workout protein (20–40g) supports recovery regardless of the zone you trained in.
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Pro Tip
Pair your zones with our VO2 max calculator and steps to calories calculator for a complete training picture.
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Frequently Asked Questions
Zone 2 (60-70%) burns a higher percentage of fat per calorie, but total fat burned depends on total calories. Higher intensity burns more total calories. For weight loss, total energy expenditure matters more than the fat-percentage myth.
Measure your pulse first thing in the morning before getting out of bed. Count beats for 60 seconds or 15 seconds × 4. Do this for several days and average. A lower resting HR generally indicates better cardiovascular fitness.
Tanaka (208 - 0.7 × age) is the most accurate for most adults. Fox (220 - age) is simpler but tends to overestimate. Gulati (206 - 0.88 × age) is better for women. Lab testing is the gold standard.
Formulas estimate max HR; individual variation is ±10-15 bpm. The Karvonen method improves accuracy by using resting HR. Use a chest strap or optical HR monitor during exercise for real-time feedback.
Yes, completely free with no signup. All calculations run in your browser. Enter your age and resting heart rate to get personalized training zones.
Zone 2 (60–70%) burns the highest percentage of fat per calorie, but total fat loss depends on total calories burned. Higher zones burn more total calories per minute. For weight loss, a mix of Zone 2 endurance and Zone 4 intervals is most effective, combined with a calorie deficit.
Chest straps are more accurate for real-time zone training, especially during high-intensity intervals. Wrist optical sensors are convenient but can lag and be less accurate during intense activity. For serious zone-based training, a chest strap is recommended.
Use a heart rate monitor and compare your current HR to the zone ranges from this calculator. Without a monitor, use the talk test: Zone 2 is conversational pace, Zone 3 allows short sentences, Zone 4 only a few words, Zone 5 is all-out effort.
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