Calculate Your Heart Rate Zones
Enter your age and optionally your resting heart rate to calculate personalized training zones. The Karvonen method uses your resting heart rate for more accurate zones tailored to your fitness level.
Very Light / Warm Up
Easy effort, comfortable breathing. Great for warm-ups, cool-downs, and active recovery. Builds a base for beginners and helps experienced athletes recover between hard sessions.
Light / Fat Burn
Sustainable pace, can hold a conversation. This zone maximizes the percentage of fat used as fuel. Ideal for building endurance, improving cardiovascular health, and long training sessions.
Moderate / Aerobic
Moderate effort, breathing harder but manageable. Strengthens the cardiovascular system, increases stroke volume, and improves overall aerobic capacity. The core of most training plans.
Hard / Anaerobic
Hard effort, can only speak in short phrases. Trains your body to clear lactic acid more efficiently. Improves speed, power, and anaerobic threshold. Used for tempo runs and interval training.
Maximum / VO2 Max
All-out effort, unsustainable beyond a few minutes. Pushes your cardiovascular system to its absolute limit. Used for short sprints and peak performance intervals. Requires adequate recovery.
Heart Rate Zones by Age (Standard Method)
This reference table shows estimated heart rate zones for common age groups using the standard 220-minus-age formula. Values are rounded to the nearest whole number.
| Age | Max HR | Zone 1 50-60% |
Zone 2 60-70% |
Zone 3 70-80% |
Zone 4 80-90% |
Zone 5 90-100% |
|---|
These are estimates. Your actual maximum heart rate may differ by 10-12 BPM from the formula. For precise zones, consider a clinical stress test.
How Heart Rate Zones Work
Heart rate training zones divide the range between your resting heart rate and maximum heart rate into intensity levels. Training in different zones produces different physiological adaptations, allowing you to target specific fitness goals.
Maximum Heart Rate (MHR)
Your maximum heart rate is the highest number of beats per minute your heart can achieve during all-out effort. The most commonly used estimate is:
MHR = 220 - Age
This formula, while widely used, is a rough approximation. It was popularized in the 1970s and has a standard deviation of about 10-12 BPM. Other formulas exist (such as Tanaka's 208 - 0.7 x age), but the 220-age formula remains the most recognized and practical for general use.
The Karvonen Formula (Heart Rate Reserve Method)
The Karvonen method is considered more accurate because it factors in your resting heart rate (RHR), which reflects your current fitness level. A lower resting heart rate generally indicates better cardiovascular fitness.
Target HR = ((MHR - RHR) x Intensity%) + RHR
The difference between your max heart rate and resting heart rate is called your Heart Rate Reserve (HRR). By applying the intensity percentage to HRR and adding back the resting heart rate, the Karvonen formula provides zones that are personalized to your fitness level.
Example: Standard Method
Age: 35 years old
- Max HR = 220 - 35 = 185 BPM
- Zone 1 (50-60%): 93 - 111 BPM
- Zone 2 (60-70%): 111 - 130 BPM
- Zone 3 (70-80%): 130 - 148 BPM
- Zone 4 (80-90%): 148 - 167 BPM
- Zone 5 (90-100%): 167 - 185 BPM
Example: Karvonen Method
Age: 35 years old, Resting HR: 60 BPM
- Max HR = 220 - 35 = 185 BPM
- Heart Rate Reserve = 185 - 60 = 125 BPM
- Zone 1 (50-60%): (125 x 0.5) + 60 = 123 to (125 x 0.6) + 60 = 135 BPM
- Zone 2 (60-70%): 135 - 148 BPM
- Zone 3 (70-80%): 148 - 160 BPM
- Zone 4 (80-90%): 160 - 173 BPM
- Zone 5 (90-100%): 173 - 185 BPM
Notice how the Karvonen zones start higher, reflecting the individual's fitness level.
How to Measure Your Resting Heart Rate
For the most accurate Karvonen calculation, measure your resting heart rate correctly:
- When: Measure first thing in the morning, before getting out of bed, on 3 consecutive days and take the average.
- How: Place two fingers (index and middle) on your wrist (radial artery) or neck (carotid artery). Count the beats for 60 seconds, or count for 15 seconds and multiply by 4.
- Alternatively: Use a fitness tracker, smartwatch, or chest strap heart rate monitor for a more consistent measurement.
- Avoid: Do not measure after caffeine, exercise, or stressful events, as these temporarily raise your heart rate.
Resting Heart Rate Ranges
| Category | RHR Range (BPM) |
|---|---|
| Elite Athlete | 35 - 45 |
| Well-Trained | 46 - 55 |
| Active / Fit | 56 - 65 |
| Average Adult | 66 - 75 |
| Below Average | 76 - 85 |
| Sedentary | 86 - 100+ |
These are general ranges. Certain medications, medical conditions, and genetics can affect resting heart rate independent of fitness level.
Training Tips by Zone
Zone 1 -- Recovery and Warm-Up
Spend 5-10 minutes here before and after every workout. Use Zone 1 for active recovery days. Walking, easy cycling, or gentle yoga all fall in this range. Duration: unlimited.
Zone 2 -- Base Endurance
The foundation of endurance training. Most long runs and rides should be in Zone 2. You should be able to hold a full conversation. Elite athletes spend 70-80% of training time here. Duration: 30 minutes to several hours.
Zone 3 -- Tempo Training
The "comfortably hard" zone. Good for improving aerobic capacity and race-pace preparation. Breathing is noticeably harder but still controlled. Duration: 20-60 minutes.
Zone 4 -- Threshold Intervals
Train at or near your lactate threshold. Use structured intervals: 3-8 minutes hard, with equal or shorter rest periods. Effective for improving speed and race performance. Duration of intervals: 3-20 minutes, total session: 20-40 minutes.
Zone 5 -- Max Effort Sprints
All-out bursts used sparingly. Short intervals of 15-90 seconds with full recovery between efforts. Improves VO2 max and neuromuscular power. Use only 1-2 times per week and only when well rested.
Frequently Asked Questions
What are heart rate training zones?
Heart rate training zones are ranges of heartbeats per minute (BPM) that correspond to different exercise intensities. There are typically 5 zones, from Zone 1 (very light effort, 50-60% of max heart rate) up to Zone 5 (maximum effort, 90-100% of max heart rate). Each zone triggers different physiological responses, allowing you to tailor your training to specific goals like fat loss, endurance, or speed.
How do I calculate my maximum heart rate?
The most common formula is 220 minus your age. For example, a 30-year-old would have an estimated maximum heart rate of 190 BPM. This is a general estimate with a standard deviation of about 10-12 BPM. Your actual maximum heart rate can only be precisely determined through a clinical stress test or a controlled all-out effort under medical supervision.
What is the Karvonen formula?
The Karvonen formula calculates target heart rate zones using your heart rate reserve (HRR), which is the difference between your maximum heart rate and resting heart rate. The formula is: Target HR = ((Max HR - Resting HR) x Intensity%) + Resting HR. This method is considered more accurate because it accounts for individual fitness levels through resting heart rate.
What is a good resting heart rate?
For adults, a normal resting heart rate is between 60 and 100 BPM. Well-trained athletes may have resting heart rates as low as 40-50 BPM. A lower resting heart rate generally indicates better cardiovascular fitness. To measure yours, check your pulse first thing in the morning before getting out of bed, ideally averaged over 3 days.
Which heart rate zone burns the most fat?
Zone 2 (60-70% of max HR) is often called the "fat-burning zone" because a higher percentage of calories burned comes from fat at this intensity. However, higher-intensity zones burn more total calories per minute. For overall fat loss, a mix of intensities combined with proper nutrition tends to be most effective. The best zone is whichever one you can sustain consistently.
How accurate is the 220-minus-age formula?
The formula provides a rough estimate with a standard deviation of about 10-12 BPM. This means your actual max heart rate could be 10-12 beats higher or lower than the estimate. Factors like genetics, fitness level, and training history all influence your true max HR. For more precise zones, use the Karvonen method with your measured resting heart rate, or get a graded exercise test from a sports medicine professional.
Can medications affect my heart rate zones?
Yes. Beta-blockers, calcium channel blockers, and some other medications lower both resting and maximum heart rate, making standard formulas inaccurate. If you take heart rate-affecting medications, consult your doctor for appropriate training intensity guidelines rather than relying on these calculators.
Does this calculator store my data?
No. All calculations run entirely in your browser. No data is sent to any server, and nothing is stored.
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Heart Rate Zone Calculator FAQ
What are heart rate training zones?
Heart rate training zones are ranges of heartbeats per minute (BPM) that correspond to different exercise intensities. There are typically 5 zones: Zone 1 (50-60% intensity) for warm-up and recovery, Zone 2 (60-70%) for fat burning, Zone 3 (70-80%) for aerobic fitness, Zone 4 (80-90%) for anaerobic threshold training, and Zone 5 (90-100%) for maximum effort and VO2 max improvement.
How do I calculate my maximum heart rate?
The most common formula is 220 minus your age. For example, a 30-year-old would have an estimated maximum heart rate of 190 BPM. This is a general estimate; actual maximum heart rate varies between individuals and can only be precisely determined through a clinical stress test.
What is the Karvonen formula?
The Karvonen formula calculates target heart rate using your heart rate reserve (HRR), which is the difference between your maximum heart rate and resting heart rate. The formula is: Target HR = ((Max HR - Resting HR) x Intensity%) + Resting HR. This method is considered more accurate because it accounts for individual fitness levels through resting heart rate.
What is a good resting heart rate?
For adults, a normal resting heart rate is between 60 and 100 BPM. Well-trained athletes may have resting heart rates as low as 40-50 BPM. A lower resting heart rate generally indicates better cardiovascular fitness. To measure yours, check your pulse first thing in the morning before getting out of bed.
Which heart rate zone burns the most fat?
Zone 2 (60-70% of max HR) is often called the fat-burning zone because a higher percentage of calories burned comes from fat at this intensity. However, higher-intensity zones burn more total calories per minute. For overall fat loss, a mix of intensities combined with proper nutrition is most effective.
How accurate is the 220-minus-age formula?
The 220-minus-age formula provides a rough estimate with a standard deviation of about 10-12 BPM. This means your actual max heart rate could be 10-12 beats higher or lower than the estimate. For more precise zones, use the Karvonen method with your measured resting heart rate, or get a clinical stress test.
Does this calculator store my data?
No. All calculations run entirely in your browser. No data is sent to any server, and nothing is stored.