What are heart rate training zones?

Heart rate zones are ranges based on percentages of your maximum heart rate that correspond to different exercise intensities and benefits. Zone 1 (50-60% max HR) is very light recovery exercise. Zone 2 (60-70%) builds aerobic base and burns fat. Zone 3 (70-80%) improves aerobic capacity. Zone 4 (80-90%) increases lactate threshold. Zone 5 (90-100%) develops maximum performance and power. Training in different zones produces different physiological adaptations.

How do I calculate my maximum heart rate?

The most common formula is 220 minus your age, giving an estimate of maximum heart rate (MHR). For example, a 40-year-old has an estimated MHR of 180 bpm. However, this can vary by ±10-15 beats. More accurate methods include the Tanaka formula (208 - 0.7 × age) or laboratory testing. Some individuals naturally have higher or lower max heart rates. Use formulas as starting points and adjust based on perceived exertion.

What's the best heart rate zone for fat burning?

Zone 2 (60-70% of max HR) is often called the 'fat-burning zone' because a higher percentage of calories burned come from fat. However, higher intensity zones burn more total calories, which matters more for weight loss. The best approach combines Zone 2 training for building aerobic base and metabolic health with higher intensity intervals for maximum calorie burn. Consistency and total calorie expenditure trump perfect zone targeting.

Should I train by heart rate or perceived exertion?

Both methods have value. Heart rate provides objective data and helps ensure you're training at intended intensities. However, it can be affected by stress, caffeine, heat, and hydration. Perceived exertion (how hard exercise feels) is subjective but accounts for all factors affecting your effort. Ideally, use both: heart rate for quantitative feedback and perceived exertion for qualitative assessment. Zone 2 should feel 'conversational' while Zone 4+ should feel challenging.

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Heart Rate Zone Calculator

Calculate your maximum heart rate and training zones to optimize your workouts.

How to Use This Calculator

Enter Your Age and Resting Heart Rate

Input your age to estimate maximum heart rate. If known, add your resting heart rate (measure first thing in morning) for more accurate zone calculations using the Karvonen method, which accounts for fitness level.

Choose Calculation Method

Select between the standard method (percentage of max HR) or Karvonen method (heart rate reserve). Karvonen is more accurate for trained individuals but requires knowing your resting heart rate.

View Your Heart Rate Zones

Review your personalized heart rate zones from Zone 1 (recovery) through Zone 5 (maximum effort). Each zone is shown as a range in beats per minute.

Train in Appropriate Zones

Use a heart rate monitor during exercise to stay in your target zone based on workout goals. Most aerobic training should be in Zones 2-3, with limited time in Zones 4-5 for specific high-intensity work. Track trends over time as fitness improves.