Heart Rate Zone Calculator
Calculate your five heart rate training zones. Train smarter by knowing exactly what intensity to run at for every workout.
Measure first thing in the morning before getting out of bed.
Every Heartbeat Fuels Your Territory
Motera turns your training runs into a real-world strategy game. Whether you are running easy in Zone 2 or pushing hard in Zone 4, every run captures territory, earns XP, and climbs leaderboards. Run loops to claim areas and watch your city map light up.
Download Free
Frequently Asked Questions
What are heart rate training zones?
Heart rate training zones are ranges of heart rate intensity, expressed as a percentage of your maximum heart rate. There are five standard zones, from Zone 1 (very easy) to Zone 5 (maximum effort). Each zone trains a different energy system and produces different physiological adaptations. By running in specific zones, you can target specific fitness goals like fat burning, endurance, speed, or lactate threshold improvement.
How do I find my maximum heart rate?
The most accurate way is a maximal exercise test supervised by a sports medicine professional. For a practical estimate, you can use the Tanaka formula: 208 minus (0.7 times your age), which is more accurate than the older 220-minus-age formula. You can also estimate it from an all-out effort like a 1-mile time trial. If you have a GPS watch that records heart rate, your highest recorded heart rate during a hard race or interval session is a reasonable approximation.
What is the Karvonen method and why is it better?
The Karvonen method (also called Heart Rate Reserve method) factors in your resting heart rate to calculate training zones. It uses the formula: Target HR = Resting HR + (Heart Rate Reserve x Zone Percentage). Heart Rate Reserve is your max HR minus your resting HR. This method is considered more accurate because it accounts for your current fitness level. A fit runner with a low resting heart rate will get different zones than a beginner with a higher resting rate, even if they have the same max HR.
What percentage of my training should be in each zone?
Most running coaches recommend the 80/20 rule: 80 percent of your weekly running should be in Zone 1 and Zone 2 (easy effort), and 20 percent should be in Zone 3 through Zone 5 (moderate to hard effort). This distribution builds the strongest aerobic base while allowing enough recovery between hard sessions. Elite runners follow this pattern, and research shows it produces better results than running at moderate intensity most of the time.
Why do my heart rate zones feel different from what the calculator shows?
Several factors affect how a heart rate zone feels on any given day: caffeine, sleep quality, hydration, stress, temperature, altitude, and accumulated fatigue. If Zone 2 feels harder than expected, you may be underestimating your max HR, or external factors are elevating your heart rate. Also, if you estimated your max HR with a formula, it could be off by 10 to 12 beats in either direction. A field test or race effort will give you a more accurate max HR.
How do I measure my resting heart rate?
Measure your resting heart rate first thing in the morning, before getting out of bed, for 3 to 5 consecutive days, and take the average. Use a chest strap or wrist-based heart rate monitor, or count your pulse manually for 60 seconds. Most fitness watches track resting heart rate automatically. A typical resting heart rate for adults is 60 to 80 bpm. Well-trained runners often have resting heart rates of 40 to 55 bpm.
Can I train by heart rate without a watch?
Yes. While a heart rate monitor gives precise data, you can approximate zones using the talk test. Zone 1 to 2: you can hold a full conversation. Zone 3: you can speak in short sentences. Zone 4: you can only say a few words. Zone 5: you cannot speak at all. Rate of Perceived Exertion (RPE) on a 1 to 10 scale also maps roughly to heart rate zones: Zone 1 is RPE 2 to 3, Zone 2 is RPE 3 to 4, Zone 3 is RPE 5 to 6, Zone 4 is RPE 7 to 8, Zone 5 is RPE 9 to 10.
Is running in Zone 2 really the best for fat burning?
Zone 2 is where your body uses the highest proportion of fat as fuel (about 60 to 70 percent of calories from fat). However, running in higher zones burns more total calories per minute, including more total fat calories in absolute terms. The advantage of Zone 2 training is that you can sustain it for much longer, accumulating more total calorie burn with less fatigue and injury risk. For weight management, Zone 2 training combined with occasional higher intensity work is the most sustainable and effective approach.
What Are Heart Rate Training Zones?
Heart rate training zones are five intensity ranges based on a percentage of your maximum heart rate. Each zone corresponds to a different level of effort, from light recovery runs to all-out sprints. By training in specific zones, you can target exactly the physiological adaptations you want, whether that is building endurance, improving speed, or burning fat.
The concept comes from exercise physiology research showing that different intensities produce different metabolic responses. Zone 2 training, for example, primarily uses aerobic fat metabolism, while Zone 5 training relies heavily on anaerobic glycolysis. Understanding these zones lets you design training plans that build all energy systems rather than always running at the same moderate effort.
This calculator supports two methods: the simpler percentage-of-max-HR method, and the more accurate Karvonen (Heart Rate Reserve) method that factors in your resting heart rate. If you know your resting HR, the Karvonen method gives more personalized zones that account for your current fitness level.
The 5 Heart Rate Zones Explained
Each zone has a specific purpose in your training plan. Here is a quick reference for all five zones.
How the Zone Calculation Works
Method 1: Percentage of Max HR
Zone Range = Max HR x Zone Percentage
The simpler method. If your max HR is 190 bpm, Zone 2 (60 to 70%) would be 114 to 133 bpm. This is a good starting point but does not account for individual fitness differences.
Method 2: Karvonen (Heart Rate Reserve)
Target HR = Resting HR + (HRR x Zone %)
where HRR = Max HR - Resting HR
The more accurate method because it factors in your resting heart rate, which reflects your fitness level. A runner with a max HR of 190 and resting HR of 50 has an HRR of 140. Their Zone 2 would be 50 + (140 x 0.60) to 50 + (140 x 0.70) = 134 to 148 bpm, which is higher and more accurate than the simple percentage method.
Estimating Your Max HR
This calculator offers three formulas to estimate your maximum heart rate from age:
Most accurate for general population. Recommended default.
Simple but tends to overestimate for young adults and underestimate for older adults.
Designed specifically for women, validated in female populations.
5 Tips for Heart Rate Based Training
Run 80 percent of your miles easy
The single most impactful change you can make to your training is running your easy days in Zone 1 and Zone 2. Most runners go too hard on easy days, which accumulates fatigue and limits the quality of their hard sessions. If you can hold a conversation while running, you are in the right zone.
Use Zone 2 for long runs
Your weekly long run should be almost entirely in Zone 2. This builds mitochondrial density, capillary networks, and teaches your body to burn fat efficiently. It might feel slow, but Zone 2 long runs are the foundation of marathon and half marathon fitness. Trust the process.
Save Zone 4 and 5 for interval days
High-intensity work should be deliberate and structured. Limit Zone 4 and Zone 5 training to 1 to 2 sessions per week with full recovery between intervals. Examples include 400m repeats at Zone 5, tempo runs at Zone 3 to 4, and hill sprints at Zone 4 to 5.
Monitor your resting heart rate
A rising resting heart rate (3 to 5 bpm above normal for multiple days) is an early warning sign of overtraining, illness, or inadequate recovery. Track your resting HR daily. If it is elevated, swap your planned hard workout for an easy Zone 1 run or a full rest day.
Do not chase heart rate numbers in every run
Heart rate is affected by heat, caffeine, sleep, stress, and hydration. If your Zone 2 pace feels harder than usual on a hot day, that is normal. Use heart rate as a guide, not a rigid rule. On days when external factors skew your HR, trust perceived effort instead.
Why Zone 2 Is the Most Important Zone
Zone 2 has become the most talked-about training zone in endurance sports, and for good reason. This is the intensity where your body maximizes aerobic fat metabolism, builds mitochondrial density, and develops the capillary networks that deliver oxygen to working muscles.
Research by Dr. Stephen Seiler and others has shown that elite endurance athletes spend 75 to 80 percent of their training time in Zone 1 and Zone 2. This is not because they cannot run faster. It is because the aerobic adaptations from easy running create the foundation for everything else. A bigger aerobic engine means faster race paces across all distances.
The key signs you are in Zone 2: you can breathe through your nose, you can hold a conversation (but it takes some effort), and you could sustain the pace for hours. If you have to open your mouth to breathe or you cannot talk in full sentences, you have drifted into Zone 3.
For most recreational runners, Zone 2 pace feels uncomfortably slow at first. That is normal. Trust that this easy running is building the aerobic foundation that will make your races faster. Many runners who slow down their easy days see breakthrough performances within 8 to 12 weeks.
