Target Heart Rate Calculator
Find your optimal training zones to maximize fat burning, improve cardio fitness, and boost performance.
Measure your pulse first thing in the morning for the most accurate resting heart rate.
What Are Heart Rate Training Zones?
Heart rate training zones are ranges of heartbeats per minute that correspond to different levels of exercise intensity. By training in specific zones, you can target different physiological adaptations -- from fat burning to maximum cardiovascular performance.
There are five commonly recognized heart rate zones, each defined as a percentage of your maximum heart rate. Your maximum heart rate (Max HR) is estimated using the formula 220 minus your age, though individual variation is normal.
Understanding your zones helps you train more efficiently. Instead of guessing whether you are working hard enough (or too hard), you can use your heart rate as an objective measure of intensity.
The 5 Heart Rate Training Zones Explained
- Zone 1 (50-60%): Recovery -- Very light effort. Ideal for warm-ups, cool-downs, and active recovery days. You can hold a full conversation easily. Improves overall health and aids recovery between hard sessions.
- Zone 2 (60-70%): Fat Burn -- Light aerobic effort. The highest percentage of calories from fat is burned in this zone. Great for building base endurance and training for longer durations.
- Zone 3 (70-80%): Aerobic -- Moderate intensity. Improves cardiovascular fitness and aerobic capacity. Breathing becomes heavier but you can still speak in sentences.
- Zone 4 (80-90%): Anaerobic -- High intensity. Increases speed, power, and lactate threshold. Hard to maintain for long periods. You can only say short phrases.
- Zone 5 (90-100%): VO2 Max -- Maximum effort. Sprint intervals only. Develops maximum speed and performance. Cannot be sustained for more than a few minutes.
Standard vs. Karvonen Method
Our calculator supports two methods for calculating heart rate zones:
The standard percentage method simply applies the zone percentages directly to your maximum heart rate. This is the simpler approach and works well as a general guideline.
The Karvonen method (also called Heart Rate Reserve method) is more personalized because it factors in your resting heart rate. The formula is:
Target HR = ((Max HR - Resting HR) x Intensity%) + Resting HR
The Karvonen method accounts for your individual fitness level, since a lower resting heart rate generally indicates better cardiovascular fitness. To use it, simply enter your resting heart rate in the calculator above.
How to Use Heart Rate Zones in Training
Elite coaches often recommend the 80/20 rule for endurance training: spend approximately 80% of your training time in Zones 1-2 (easy effort) and 20% in Zones 3-5 (moderate to hard effort). This polarized approach has been shown to produce the best long-term fitness gains.
For weight loss, a mix of Zone 2 steady-state cardio and Zone 4-5 interval training is most effective. Zone 2 burns a higher percentage of fat calories, while higher zones burn more total calories and create a greater metabolic afterburn (EPOC).
For general fitness, aim to include at least 150 minutes per week of Zone 2-3 activity, as recommended by the American Heart Association.
Frequently Asked Questions
What is target heart rate?
Your target heart rate is the ideal range of heartbeats per minute during exercise to achieve specific training goals. Different zones correspond to different intensities, from light fat-burning activity (50-60% of max) to maximum effort (90-100% of max).
How do I calculate my maximum heart rate?
The simplest formula is 220 minus your age. For example, a 30-year-old would have an estimated max heart rate of 190 bpm. While this is an estimate, it provides a reliable baseline for calculating training zones.
What is the Karvonen method?
The Karvonen method calculates heart rate zones using your resting heart rate for more personalized results. The formula is: Target HR = ((Max HR - Resting HR) x Intensity%) + Resting HR. This accounts for your individual fitness level.
What heart rate zone burns the most fat?
Zone 2 (60-70% of max HR) burns the highest percentage of calories from fat. However, higher intensity zones burn more total calories. For weight loss, a mix of Zone 2 and higher intensity training is most effective.
How do I measure my resting heart rate?
Measure first thing in the morning before getting out of bed. Place two fingers on your neck or wrist, count beats for 60 seconds. Take measurements over 3-5 mornings and average them for the most accurate result.