It does not know your real maximal heart rate, your lactate threshold, your medication or your training history. Beta blockers and some other drugs lower heart rate at every intensity, which makes every heart-rate zone wrong. Heat, dehydration, poor sleep, caffeine and altitude push heart rate up at the same effort. The formulas are averages from healthy adults, and the individual scatter of about 10 bpm [2] is larger than the width of the band itself for some people. The tool describes a typical range; whether it is right for you is something your own breathing, a lactate test or a sports physician can tell you, not this page.
Zone 2 heart rate: calculator and chart by age
Your Zone 2 heart rate is roughly 70 to 80 percent of your maximal heart rate, or 60 to 70 percent of your heart-rate reserve if you know your resting pulse. At 40, with an estimated maximal heart rate of 180 bpm, that is about 126 to 144 bpm. Age formulas scatter by about 10 bpm from person to person, so treat the band as a starting point and let the talk test correct it [1, 2].
Enter your age, optionally your resting and measured maximal heart rate, and get your Zone 2 band by two published methods. The chart below shows the band for every decade.
Zone 2 heart rate chart by age
The chart applies the same arithmetic the calculator runs to every decade: maximal heart rate from 208 - 0.7 x age [1], Zone 2 as 70 to 80 percent of it, and the Karvonen band for a resting heart rate of 60 bpm [3]. Your own resting pulse shifts the Karvonen column; enter it above.
| Age | HRmax (208 - 0.7 x age) | Zone 2, 70 to 80 % HRmax | Zone 2, Karvonen at resting 60 |
|---|---|---|---|
| 20 | 194 | 136 to 155 | 140 to 154 |
| 30 | 187 | 131 to 150 | 136 to 149 |
| 40 | 180 | 126 to 144 | 132 to 144 |
| 50 | 173 | 121 to 138 | 128 to 139 |
| 60 | 166 | 116 to 133 | 124 to 134 |
| 70 | 159 | 111 to 127 | 119 to 129 |
Values in beats per minute, rounded. The age formula has an individual scatter of about 10 bpm [1, 2], so a measured maximal heart rate always beats the estimate. The chart is a reference, not a training prescription.
How the calculator works
Three inputs, two published formulas, no hidden factors. Every step is shown so you can check the arithmetic yourself.
- 1Enter your age. The calculator estimates your maximal heart rate as 208 - 0.7 x age, the Tanaka equation from a meta-analysis of 351 studies and a lab sample of 514 healthy adults [1].
- 2If you have a measured maximal heart rate from a lab test or a genuine all-out effort, enter it. It replaces the estimate, because the age formula scatters by about 10 bpm from person to person [2].
- 3Zone 2 by percent of maximal heart rate is 70 to 80 percent of that number. This is the band most endurance coaches mean when they say Zone 2, and it is what the chart above uses.
- 4If you add your resting heart rate, the calculator also runs the Karvonen method: resting pulse plus 60 to 70 percent of the difference between maximal and resting heart rate [3]. Because it uses your own resting value, it adapts to your fitness.
- 5Read the band as a starting point and confirm it with the talk test: in Zone 2 you can speak in full sentences, but you would rather not sing. If the band and the talk test disagree, the talk test wins.
What Zone 2 actually is, and why the definitions differ
Physiologically, Zone 2 is the highest intensity at which your muscles still run mostly on fat and your blood lactate stays roughly flat, typically below about 2 mmol/L. San-Millan and Brooks measured this in professional cyclists and in less fit adults: the trained group oxidised far more fat at the same relative intensity and kept lactate low much longer, which is what a large aerobic base looks like in the lab [4]. Heart rate is only a proxy for that state. Coaches translate it into a band because nobody trains with a lactate meter on every ride. The catch is that the translation is not standardised. The five-zone scale that Garmin and Polar ship by default sets Zone 2 at 60 to 70 percent of maximal heart rate. Apple Watch has worked out its zones from heart-rate reserve, your resting and maximal heart rate, since watchOS 9, so its bands differ again. Most endurance coaching models place the physiological Zone 2 higher, around 70 to 80 percent of maximal heart rate or 60 to 70 percent of heart-rate reserve. That is the band this calculator uses, and it is why your watch may call the same effort Zone 3. In elite endurance training the bulk of the volume, roughly 80 percent, sits in this easy region, with the remaining 20 percent hard [5]. That distribution, not the exact bpm, is the point.
Karvonen or percent of maximal heart rate: which method to use
Both methods start from your maximal heart rate. Without a measurement the calculator estimates it with 208 - 0.7 x age [1]. That equation replaced the older 220 minus age rule, which underestimates the maximum in older adults. It is still a population average: in the Norwegian HUNT study of 3,320 healthy adults the standard error of the age formula was about 11 bpm, so a real 40-year-old can have a maximum of 170 or 190 and both are normal [2]. The percent-of-maximum method multiplies that number by 0.70 and 0.80. The Karvonen method, published in 1957, works with your heart-rate reserve instead, the gap between resting and maximal heart rate, and places Zone 2 at 60 to 70 percent of that reserve above your resting pulse [3]. Because the resting pulse is added back on top, the Karvonen band moves with it: a low resting pulse, as fit people often have, puts the band slightly lower, and a high resting pulse puts it slightly higher, by 3 to 4 bpm for every 10 bpm of resting pulse. The two methods usually land within 5 to 10 bpm of each other. When they disagree, prefer Karvonen if your resting pulse was measured properly, lying down after waking, and prefer a measured maximal heart rate over any formula.
The talk test: the check that beats every formula
Every band on this page is an estimate. Your body gives a more direct signal. In Zone 2 you can hold a conversation in full sentences, breathing through your nose is possible for most people, and you finish the session feeling you could have gone on. If you can only manage short phrases, you are above Zone 2. If you could sing comfortably, you are below it. Beginners often find that the heart rate that passes the talk test is lower than the formula band, because their aerobic base is small; after a few months the same heart rate feels easier and the band grows into the formula. Use the calculator for the first weeks, then let the talk test and, if you have one, a resting heart rate trend refine it. A lactate test at a sports-medicine institute pins the real threshold if you want the exact number.
How much Zone 2 per week, and why it is worth it
The American College of Sports Medicine recommends at least 150 minutes of moderate or 75 minutes of vigorous aerobic activity per week for healthy adults, in sessions of 30 to 60 minutes, and defines moderate as 40 to 59 percent and vigorous as 60 to 89 percent of heart-rate reserve [7]. By that definition, Zone 2 at 60 to 70 percent of heart-rate reserve already falls in the lower part of the vigorous range, even though it feels easy to trained people. The reason to accumulate it is the link between cardiorespiratory fitness and survival: in a Cleveland Clinic cohort of 122,007 adults followed for a median of 8.4 years, the least fit quarter (below the 25th percentile) had about five times the mortality of the elite group (roughly the top 2 percent), and there was no fitness level above which the benefit stopped [6]. That is observational data, not proof that training causes the difference, but it is the strongest reason to build a base. A practical starting point for most people is three sessions of 30 to 45 minutes per week, walking briskly, cycling or on a rower, and adding time before adding intensity. How Zone 2 and harder VO2max intervals fit together is covered in our guide.
What this calculator cannot tell you
Frequently asked questions
What is my Zone 2 heart rate at 40, 50 or 60?
With the age formula 208 - 0.7 x age [1] and Zone 2 as 70 to 80 percent of maximal heart rate: at 40 about 126 to 144 bpm, at 50 about 121 to 138 bpm, at 60 about 116 to 133 bpm. With a resting pulse of 60 the Karvonen band is a little narrower and slightly higher: 132 to 144, 128 to 139 and 124 to 134 bpm [3]. Enter your own resting pulse above for your personal band.
Karvonen or percent of maximal heart rate: which is more accurate?
Karvonen, if your resting heart rate was measured properly. It uses your heart-rate reserve, the gap between resting and maximal pulse, so it adapts to your fitness [3]. The percent-of-maximum method ignores the resting pulse and tends to sit too high for very fit people and too low for people with a high resting pulse. Both depend on the maximal heart rate, and a measured maximum beats any age formula [1, 2].
Why does my Garmin or Apple Watch show a different Zone 2?
Because the default five-zone scale on Garmin and Polar watches sets Zone 2 at 60 to 70 percent of maximal heart rate, while the physiological Zone 2 that endurance coaches mean sits around 70 to 80 percent of maximal heart rate or 60 to 70 percent of heart-rate reserve. The same effort is Zone 3 on the watch and Zone 2 in a training plan. Apple Watch has calculated its zones from heart-rate reserve, your resting and maximal heart rate, since watchOS 9, so its Zone 2 moves with your resting pulse and does not match the 60 to 70 percent line either. You can change the zone boundaries in the watch settings; the comparison line in the result above shows both scales.
My heart rate is far above the band even when walking. What is wrong?
Usually nothing. Beginners have a small aerobic base, so a low effort already produces a high heart rate. Heat, poor sleep, caffeine, stress and dehydration push it up further. Train at the effort that passes the talk test even if the pulse is above the band; after a few months the same pace will sit lower. If the resting pulse is also unusually high for weeks, or you feel palpitations or chest pain, see a doctor.
How many minutes of Zone 2 per week?
The ACSM recommends at least 150 minutes of moderate aerobic activity per week, in sessions of 30 to 60 minutes [7]. For a base-building phase, three to four sessions of 30 to 60 minutes is a practical start, with the rule of adding time before adding intensity. Elite endurance athletes spend about 80 percent of their training time in this easy region and about 20 percent hard [5]; the ratio, not the exact minutes, carries over to amateurs.
Is the talk test enough, or do I need a heart-rate monitor?
The talk test alone works well: full sentences yes, singing no. A heart-rate monitor adds consistency across days and shows drift within a session. A chest strap is more accurate than a wrist sensor during exercise. Neither replaces a lactate test if you want the exact threshold, but for building a base the talk test plus the band from this calculator is enough.
Do I need a lactate test to find my Zone 2?
No. A lactate test at a sports-medicine institute gives the precise intensity at which lactate starts to rise, which is the physiological definition of the top of Zone 2 [4]. It is worth it for athletes and for anyone who wants their zones exact. For most people the formula band plus the talk test is a reasonable start, but in a lab study of 50 cyclists fixed percentages of maximal heart rate lined up with the measured first threshold very differently from person to person [8]. A test typically costs 80 to 250 euros as a self-pay service in Germany, Austria and Switzerland.
Does the calculator use 220 minus age?
No. It uses 208 - 0.7 x age from Tanaka, Monahan and Seals, a meta-analysis of 351 studies with a laboratory check in 514 healthy adults [1]. The 220 minus age rule underestimates the maximal heart rate of older adults by up to 10 bpm. Both are population averages with an individual scatter of about 10 bpm, confirmed in the HUNT study of 3,320 adults [2], so a measured maximal heart rate is always better.
Sources
Every formula on this page is cited. The numbered markers in the text refer to this list.
- [1] Tanaka H, Monahan KD, Seals DR (2001). Age-predicted maximal heart rate revisited. Journal of the American College of Cardiology. doi:10.1016/S0735-1097(00)01054-8
- [2] Nes BM, Janszky I, Wisloff U, Stoylen A, Karlsen T (2013). Age-predicted maximal heart rate in healthy subjects: The HUNT Fitness Study. Scandinavian Journal of Medicine & Science in Sports. doi:10.1111/j.1600-0838.2012.01445.x
- [3] Karvonen MJ, Kentala E, Mustala O (1957). The effects of training on heart rate: a longitudinal study. Annales Medicinae Experimentalis et Biologiae Fenniae, 35(3), 307-315. PMID 13470504
- [4] San-Millan I, Brooks GA (2018). Assessment of metabolic flexibility by means of measuring blood lactate, fat, and carbohydrate oxidation responses to exercise in professional endurance athletes and less-fit individuals. Sports Medicine. doi:10.1007/s40279-017-0751-x
- [5] Seiler S (2010). What is best practice for training intensity and duration distribution in endurance athletes?. International Journal of Sports Physiology and Performance. doi:10.1123/ijspp.5.3.276
- [6] Mandsager K, Harb S, Cremer P, Phelan D, Nissen SE, Jaber W (2018). Association of cardiorespiratory fitness with long-term mortality among adults undergoing exercise treadmill testing. JAMA Network Open. doi:10.1001/jamanetworkopen.2018.3605
- [7] Garber CE, Blissmer B, Deschenes MR, Franklin BA, Lamonte MJ, Lee IM, Nieman DC, Swain DP (2011). Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: guidance for prescribing exercise. Medicine & Science in Sports & Exercise. doi:10.1249/MSS.0b013e318213fefb
- [8] Meixner B, Filipas L, Holmberg HC, Sperlich B (2025). Zone 2 Intensity: A Critical Comparison of Individual Variability in Different Submaximal Exercise Intensity Boundaries. Translational Sports Medicine. doi:10.1155/tsm2/2008291
Build the base, then test the ceiling
Zone 2 is the floor of endurance. Your VO2max is the ceiling. Our guide explains how the two fit into a week, and the VO2max calculator estimates where you start.
Karvonen 60 to 70 % HRR, 70 to 80 % HRmax.