Calculate Zone 1 through Zone 5 targets using your age, maximum heart rate, and resting heart rate so you can train with more precision and less guesswork.
Calculated using: 220 - Age formula
This calculator is built for one simple job: helping you turn raw heart rate data into useful workout targets. If you enter only your age, you get a quick estimate based on the common 220 minus age rule. If you also enter your resting heart rate, the calculation becomes more personalized because it uses heart rate reserve, which reflects the space between your resting heart rate and your maximum heart rate. That makes the zone ranges more useful for endurance training, recovery days, interval sessions, and fat burning zone work.
Your age is used to estimate maximum heart rate when you do not have a lab or field-tested number.
A morning resting heart rate gives you a more personal heart rate reserve calculation and better training zones.
If you have a tested max heart rate from a race, hard interval, or supervised test, switch to manual input and use it.
Use Zone 1 for recovery, Zone 2 for aerobic base, Zone 3 for steady efforts, Zone 4 for threshold, and Zone 5 for short high intensity work.
For the best results, measure resting heart rate before you get out of bed, after a normal night of sleep, and before coffee or a hard day of work raises your pulse. If you use a smartwatch or chest strap, check several days and use an average. Small daily changes are normal. The goal is not one perfect reading. The goal is a realistic baseline you can use across a training block.
Once your numbers are in, use the results as practical ranges rather than rigid limits. Your heart rate rises more slowly in the first minutes of a workout, and it can drift upward in heat, humidity, altitude, or dehydration. That means your recovery zone, aerobic base, and lactate threshold work should be guided by both heart rate and perceived exertion. If the number says Zone 2 but talking feels difficult, back off. If the number looks high because it is hot outside, adjust the session instead of forcing the pace.
Each zone represents a different training effect. The ranges are designed to help you choose the right effort for the day instead of letting every workout drift into the same middle intensity.
Use this range for warm-ups, cool-downs, easy walks, and very light spin sessions. You should be able to speak in full sentences. This zone supports blood flow and recovery without adding much fatigue.
This is the classic endurance training zone. It is often described as a conversational effort. Long runs, bike rides, brisk walks, and easy rower sessions fit here. Many people spend the largest share of weekly training in Zone 2 because it improves aerobic efficiency with manageable stress.
This moderate range can improve stamina, but it is also the zone where many people spend too much time by accident. It is useful for tempo progressions, brisk cardio circuits, or sustained race-pace practice for newer athletes.
This is hard but controlled. You can hold it only for limited blocks. Threshold intervals, race-pace sessions, and serious conditioning work often land here. The purpose is to improve your ability to sustain hard efforts before fatigue takes over.
Use this for short intervals, sprints, and VO2 max work. It is effective, but it should be used carefully because it creates a lot of fatigue and needs longer recovery.
A useful way to read your results is to match each zone with a clear purpose before the workout starts. If today is an easy day, do not let it drift into Zone 3 just because the pace feels good early on. If today is a threshold session, stay honest about recovery between intervals so the hard work stays high quality.
Your results also help you compare changes over time. If you can hold a faster running pace or bike speed while staying in the same aerobic base range, your fitness is improving. That is one reason heart rate training is popular with runners, cyclists, and general fitness users who want a simple way to monitor intensity.
If you want to know how to calculate heart rate zones manually, this is the process the calculator uses.
Heart Rate Reserve = Maximum Heart Rate - Resting Heart Rate
Target Heart Rate = (Heart Rate Reserve x Intensity) + Resting Heart Rate
The intensity changes by zone. Zone 1 uses 50% to 60%, Zone 2 uses 60% to 70%, Zone 3 uses 70% to 80%, Zone 4 uses 80% to 90%, and Zone 5 uses 90% to 100%.
Here is a worked example with real numbers. Imagine you are 35 years old and your morning resting heart rate is 58 bpm. If your tested maximum heart rate is 185 bpm, your heart rate reserve is 127 bpm. To find Zone 2, multiply 127 by 0.60 and 0.70, then add 58 back to each result. That gives you about 134 to 147 bpm. Your Zone 4 range would be 160 to 172 bpm, and your Zone 5 would start near 172 bpm and go up to your maximum.
If you do not know your actual maximum heart rate, the calculator auto-fills it with 220 minus age. For the same 35-year-old, that estimate would be 185 bpm, which happens to match the example above. In real life, many people sit above or below the estimate. That is why a tested value is useful if you train seriously or notice your easy pace and zone numbers do not line up.
Some calculators use percentages of maximum heart rate only. That method is simpler, but it ignores resting heart rate. Two people can have the same age and the same estimated maximum heart rate while having very different resting heart rates and fitness levels. Heart rate reserve solves part of that problem, which is why coaches often prefer it for personalized endurance training plans.
Remember that formulas are starting points, not medical tests. If you take beta blockers or other medications that affect heart rate, or if you have a heart condition, you should use exercise guidance from a qualified clinician instead of relying only on generic training zones.
The same zones can support different goals. The key is knowing which zone deserves most of your time.
If your Zone 2 range is 134 to 147 bpm, use that range for a 40-minute brisk walk or incline treadmill session three to five days per week. This is a practical fat burning zone target that is easier to repeat than hard intervals every day.
A runner with a Zone 2 of 138 to 152 bpm can use that range for a 60-minute conversational run. If heart rate climbs above the top end on hills, slow down or walk briefly to stay focused on aerobic base work.
A cyclist with Zone 2 at 129 to 142 bpm might aim for a 90-minute ride at that effort on weekends. This is ideal for building endurance training volume without leaving the legs flat for the next hard session.
If Zone 4 is 160 to 172 bpm, try 4 x 6 minutes in that range with 3-minute recoveries in Zone 1 or low Zone 2. This is a classic way to improve lactate threshold and race pace control.
The day after a long race or hard gym circuit, keep activity in Zone 1. For many people that means a 20 to 30 minute walk, easy spin, or gentle row instead of another hard workout.
Beginners often do best with two to four weekly sessions in Zone 1 and Zone 2 before worrying about VO2 max work. This helps you build consistency, improve recovery, and avoid turning every session into an unsustainable grind.
One of the most useful tips is to assign a purpose to every session before it starts. If the purpose is recovery, keep your ego out of it. If the purpose is threshold, arrive fresh enough to do the work well. Heart rate zones make that decision easier because they give you clear limits.
Another practical tip is to watch for context. Heat, travel, poor sleep, alcohol, or a stressful work week can push heart rate higher than normal. In those cases, the best move is often to slow down and stay in the intended zone rather than forcing your usual pace.
This is the biggest gap on many basic calculator pages, and it has a direct impact on your results.
Your resting heart rate should be measured when your body is truly at rest. The best time is right after you wake up, before you stand up, check email, drink caffeine, or start moving around. You can count your pulse at the wrist or neck for 60 seconds, or use a wearable if it gives reliable resting values. If your number jumps from 56 one day to 63 the next, do not panic. Look for a pattern over several mornings and use the average.
A lower resting heart rate often reflects better cardiovascular efficiency, but low is not always better for every person. Medications, stress, dehydration, illness, overtraining, and poor sleep can all change the number. That is why it is helpful to note your reading for a week instead of treating one data point like a verdict on your fitness.
If you live in a warm U.S. state such as Florida or Texas and often train outdoors, remember that heat and humidity can elevate workout heart rate even when your resting baseline stays normal. In those conditions, many athletes slow pace but keep the same zone target to avoid turning an easy session into hidden threshold work.
When should you override the auto-estimated maximum heart rate? Use manual input if you have a tested value from a treadmill test, a coached field test, or a hard race effort that clearly exceeded the estimate. This is especially useful for experienced runners and cyclists, because a max HR estimate that is off by even 8 to 12 beats can shift every training zone.
A final tip: compare your numbers with your breathing and perceived exertion. If your monitor says Zone 2 but you cannot talk in short sentences, the device may be lagging, your max HR estimate may be low, or the day may simply be hotter and harder than usual. Use the data to guide you, not to override common sense.
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First, estimate or measure your maximum heart rate. Next, subtract your resting heart rate to get heart rate reserve. Then multiply heart rate reserve by each training percentage and add your resting heart rate back. For example, Zone 2 uses 60% to 70% intensity. If your max heart rate is 185 and your resting heart rate is 58, your heart rate reserve is 127. Zone 2 is 58 + 127 x 0.60 to 58 + 127 x 0.70, or about 134 to 147 bpm.
Zone 2 is usually the 60% to 70% range of your heart rate reserve or maximum heart rate, depending on the method used. It matters because it builds aerobic base, supports endurance training, improves fat oxidation, and is sustainable for long sessions.
Yes, if you know your resting heart rate, using it usually gives you more personalized training zones. The Karvonen method accounts for both maximum heart rate and resting heart rate, so it reflects your current fitness better than a simple age-only estimate.
The 220 minus age formula is a simple estimate, not a perfect measurement. It works as a starting point for many people, but actual maximum heart rate can vary because of genetics, training status, medication, and individual physiology. If you have tested max heart rate data, use that instead.
Measure your pulse first thing in the morning before caffeine, stress, or activity raise it. Count beats for a full 60 seconds, or use a reliable wearable and average several mornings. Using a weekly average is often more useful than relying on a single reading.
Zone 2 is commonly called the fat burning zone because a larger share of energy comes from fat at that effort level. Still, total calorie burn matters too, so the best plan is usually a mix of easy aerobic work, strength training, and consistency.
Recalculate every 6 to 12 weeks, or sooner if your resting heart rate, fitness level, or training volume changes noticeably. Updated zones help keep your recovery workouts easy enough and your harder sessions demanding enough.
Yes. Beginners often benefit the most because heart rate zones create clear effort limits. Most new exercisers should spend most cardio time in Zone 1 and Zone 2, then add Zone 3 to Zone 5 work gradually as fitness improves.
Daily heart rate can shift because of heat, hydration, altitude, sleep, stress, caffeine, illness, and accumulated fatigue. That is why heart rate zones work best when you combine them with perceived exertion and how you feel during the session.