Calculate your target heart rate zones based on age, resting heart rate, and fitness level
Input your current age in years. This is used to calculate your estimated maximum heart rate.
For more accurate results, measure and enter your resting heart rate (beats per minute). Measure it when you first wake up, before getting out of bed.
Choose your preferred maximum heart rate formula and calculation method. Different formulas and methods can yield slightly different results.
Press the Calculate button to generate your personalized target heart rate zones.
View your five training zones (1-5) with their corresponding heart rate ranges. Use these zones to guide your workouts.
Heart rate is a measure of the number of contractions the heart makes per minute, measured in beats per minute (bpm). To effectively use this target heart rate calculator, it is important to understand the concepts of resting heart rate, maximum heart rate, and heart rate reserve.
A target heart rate (also called training heart rate range) is the range of heartbeats per minute you should aim for during exercise to achieve cardiovascular benefits while exercising safely. Different zones provide different benefits, from fat burning to high-intensity training.
Maximum heart rate is a measure of the highest number of beats per minute the heart reaches during intense exercise. It is most accurately measured through a cardiac stress test. The theoretical maximum human heart rate is 300 bpm.
Maximum heart rate is commonly estimated using various formulas. While these formulas provide useful estimates for the average maximum heart rate for a given age group, individual results can vary significantly. Maximum heart rate is largely correlated with age, and most formulas are primarily based on this.
Common Maximum Heart Rate Formulas:
Resting heart rate is a measure of a person's heart rate at rest, defined as when a person is awake in a neutral environment and not subject to stress or surprise. It can be measured using various devices or by counting your pulse for one minute.
A typical resting heart rate for an adult ranges between 50-90 bpm. Some sources state this range as 60-100 bpm, but this range is slightly dated. A resting heart rate above the upper range is referred to as tachycardia, while one below the lower range is referred to as bradycardia. Very fit athletes often have resting heart rates below 60 bpm.
How to Measure Resting Heart Rate:
A person's heart rate reserve (HRreserve) is the difference between their maximum heart rate (MHR) and their resting heart rate (RHR). This value is used in the Karvonen method for calculating target heart rate zones.
Heart Rate Reserve Formula:
HRreserve = MHR - RHR
Example: If you have a maximum heart rate of 180 bpm and a resting heart rate of 68 bpm, your heart rate reserve is:
HRreserve = 180 - 68 = 112 bpm
The larger your heart rate reserve, the greater the capacity of your heart to increase its output during exercise, which is a sign of better cardiovascular fitness.
Maintaining a heart rate within a certain range, referred to as the target heart rate or training heart rate range, has been found to be beneficial for exercise. The five zones provide different benefits based on intensity level.
Zone 1 (50-60%) - Light to Moderate Activity
Warm-up, cooldown, recovery days, easy training
Zone 2 (60-70%) - Fat Burning & Endurance
Building aerobic fitness, can be maintained for extended periods
Zone 3 (70-80%) - Moderate to Hard Effort
Building speed and strength, improving performance
Zone 4 (80-90%) - High Intensity
Training maximum output capacity, interval training
Zone 5 (90-100%) - Maximum Effort
Short sprints, muscular efficacy, cardiovascular improvement (use sparingly)
Each zone has its training benefits. It's important to design your workout around these zones to best balance improvement and recovery.
The Karvonen method calculates target heart rate zones using heart rate reserve, which factors in resting heart rate on top of maximum heart rate. This method is often more accurate than simple percentage-based methods because it accounts for individual fitness levels.
Karvonen Formula:
THR = (MHR - RHR) × Intensity% + RHR
Example: For a 36-year-old with a resting heart rate of 70 bpm calculating a 70-80% target heart rate zone:
This method is considered more personalized because it accounts for the individual's resting heart rate, which can vary significantly between people of the same age and fitness level.
Stay in your target zone for optimal cardiovascular benefits
Track improvements as your resting heart rate decreases over time
Design high-intensity intervals within your calculated heart rate zones
Set specific heart rate targets based on your fitness objectives
The most accurate way is through a cardiac stress test performed by medical professionals. However, this is expensive and not practical for most people. Formulas like Haskell & Fox or Tanaka provide reasonable estimates for general fitness purposes, though individual variation can be significant.
Measure your resting heart rate first thing in the morning when you wake up, before getting out of bed. Use your index and middle fingers to find your pulse on your wrist or neck, and count the beats for 60 seconds. For the most accurate reading, average multiple measurements over several days.
The percentage-based method (Haskell & Fox) uses only your maximum heart rate to calculate zones. The Karvonen method uses heart rate reserve (MHR - RHR), making it more personalized by accounting for your resting heart rate and individual fitness level.
Heart rate is a good indicator but shouldn't be your only guide. Factors like medications, fitness level, environmental conditions, and stress can affect heart rate. Combined with perceived exertion and other metrics, heart rate provides a comprehensive view of your effort level.
Different calculators may use different MHR formulas and calculation methods. The Haskell & Fox formula (220 - age) is most common but less accurate for some individuals. Individual variation in maximum heart rate can be 15-20 bpm around the estimated value.
No. A well-designed workout includes different zones for warm-up (Zone 1), main workout (Zones 2-4 depending on goals), and cool-down (Zone 1). Varying your zones throughout the week helps improve cardiovascular fitness and prevents overtraining.
Your theoretical maximum heart rate (Zone 5: 90-100%) should generally not be exceeded during exercise. However, brief spikes above this during all-out sprints are normal. If you consistently experience concerning heart rate elevations or symptoms, consult a healthcare provider.
Recalculate your zones annually or whenever your resting heart rate changes significantly. As your fitness improves, your resting heart rate typically decreases, which can shift your target zones.
Explore more free online calculators and utilities from our collection:
Calculate your Body Mass Index and health category.
Estimate your daily calorie needs and burn rates.
Estimate your body fat percentage based on measurements.
Calculate your Basal Metabolic Rate.
Determine your ideal weight range based on height.
Calculate running pace and speed metrics.