Zone 2 Heart Rate Calculator

Age

Resting Heart Rate (optional)

Calculation Method

Your Zone 2 Range

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bpm

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Max Heart Rate (bpm)

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Resting HR Used (bpm)

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Heart Rate Reserve

💬 The Talk Test for Zone 2

In Zone 2, you should be able to hold a full conversation without gasping. If you can only say a few words, you're in Zone 3 or higher. If you could easily sing, you're probably in Zone 1. Adjust your pace until you can talk comfortably but not effortlessly.

What is Zone 2 training?

Zone 2 is the second of five heart rate training zones, sitting at 60–70% of your maximum heart rate (or 60–70% of your Heart Rate Reserve using the Karvonen method). It feels like a comfortable, sustainable effort — you can breathe through your nose and hold a conversation.

Despite feeling easy, Zone 2 is one of the most powerful training zones for long-term health and athletic performance. It targets the aerobic energy system directly, training your body to burn fat as its primary fuel source.

Why Zone 2 matters so much

Zone 2 training has gained enormous attention in endurance sports and longevity research. Here's why:

Builds mitochondrial density: Zone 2 increases the number and efficiency of mitochondria in your muscle cells — the engines that produce energy aerobically.
Improves fat oxidation: Your body becomes better at burning fat for fuel, which matters both for endurance performance and body composition.
Enhances cardiovascular efficiency: Stroke volume (how much blood your heart pumps per beat) increases, meaning your heart gets stronger with less stress.
Supports recovery: Low enough intensity to promote blood flow and recovery without adding training stress.
Longevity benefits: VO2 max — heavily influenced by Zone 2 training — is one of the strongest predictors of long-term health outcomes.

How much Zone 2 should you do?

For recreational fitness, aim for 150–180 minutes of Zone 2 per week. Elite endurance athletes often do 80% of their total training volume in Zone 2 — the so-called "80/20 rule." Even 3 sessions of 45–60 minutes per week will produce meaningful aerobic adaptations over time.

Best activities for Zone 2

Any aerobic activity works — the key is keeping your heart rate in range. Running, cycling, rowing, swimming, and brisk walking are all effective. Cycling and rowing are especially useful because they're lower impact and easier to stay in Zone 2 without accidentally spiking into Zone 3.

Karvonen vs. % of Max HR

The Karvonen method accounts for your resting heart rate, making zones more personalised. It's particularly useful for people with a low or high resting HR. The % of Max HR method is simpler and works well for most people as a starting point.

Zone 2 by activity type

The heart rate target is the same regardless of activity — but how it feels differs by sport:

Running: Zone 2 often requires slowing to a jog or even a walk for beginners. If conversation is difficult, you've left Zone 2. Many runners are surprised how slow this pace is initially.
Cycling: Easier to control intensity than running. A moderate resistance on flat terrain works well. Power meters make Zone 2 cycling very precise.
Rowing: Full-body engagement makes it easy to spike heart rate. A longer stroke with slower cadence helps stay in Zone 2.
Swimming: Hard to monitor heart rate mid-swim. Use the talk test when resting between laps, or a waterproof HR monitor.
Walking: For beginners or those returning from a break, brisk walking is a legitimate Zone 2 activity. As fitness improves, the same heart rate will correspond to a faster pace.

Zone 2 and longevity

VO2 max — your body's maximum rate of oxygen consumption — is one of the strongest predictors of all-cause mortality and cardiovascular health. Zone 2 training is the primary driver of VO2 max development over months and years of consistent training. Research consistently shows that people in the top quartile of VO2 max for their age have dramatically lower risk of all-cause mortality than those in the bottom quartile.

Zone 2 for beginners: what to expect

If you are new to structured training, Zone 2 will likely feel embarrassingly slow. This is normal. Within 4–6 weeks of consistent Zone 2 sessions, most beginners notice that the same heart rate corresponds to a faster pace or more comfortable effort. The adaptation is happening even when progress is hard to see — consistency over 8–12 weeks is where the meaningful changes emerge.

Zone 2 reference table by age

Age	Est. Max HR	Zone 2 (% Max HR)	Zone 2 (Karvonen, RHR 60)
25	195	117–137 bpm	141–161 bpm
30	190	114–133 bpm	138–158 bpm
35	185	111–130 bpm	135–155 bpm
40	180	108–126 bpm	132–150 bpm
45	175	105–123 bpm	129–147 bpm
50	170	102–119 bpm	126–144 bpm
55	165	99–116 bpm	123–141 bpm
60	160	96–112 bpm	120–136 bpm

Karvonen values assume resting heart rate of 60 bpm. Use the calculator above for your personal range.

Frequently asked questions

How do I know if I'm in Zone 2?

Use the talk test: you should be able to speak full sentences without gasping. If you have a heart rate monitor, aim for the bpm range this calculator gives you. Many people are surprised how slow they need to go to stay in Zone 2 — especially beginners. It should feel almost too easy.

Is Zone 2 the same as the "fat burning zone"?

Largely yes. Zone 2 corresponds to what's often called the fat burning zone because fat oxidation is highest at this intensity. However, "fat burning" doesn't directly equal fat loss — total calorie balance matters more. Zone 2's real value is in building the aerobic engine that makes you fitter and healthier long-term.

Can I do Zone 2 every day?

Yes — Zone 2 is low enough intensity that most people can do it daily without excessive fatigue. That said, listen to your body. Most training plans suggest 3–5 Zone 2 sessions per week with rest or strength training on other days.

Why is my Zone 2 pace so slow?

This is extremely common, especially for beginners. As aerobic fitness improves, you'll be able to run faster at the same heart rate. Many people need to walk or jog very slowly at first to stay in Zone 2. Don't be discouraged — this is normal and it gets better within weeks of consistent training.

What's the difference between Zone 2 and Zone 3?

Zone 3 (70–80% max HR) starts to feel moderately hard — you can still talk but in shorter sentences. Zone 3 is aerobically beneficial but accumulates more fatigue than Zone 2. One of the most common training mistakes is doing most cardio in Zone 3 (too hard to be true Zone 2, too easy to be truly intense) — sometimes called "grey zone" training.

How long should Zone 2 sessions be?

Sessions of 45–90 minutes are most effective for Zone 2 adaptations. Unlike high-intensity work, Zone 2 can be sustained for extended periods — making longer sessions more practical. Even 30-minute sessions are beneficial, especially when starting out. Most endurance coaches recommend 3–5 sessions per week totalling 150–300 minutes.

Does Zone 2 training help with weight loss?

Zone 2 burns fat as its primary fuel source and is sustainable for long durations — meaning more total fat can be burned per session than at higher intensities that cannot be sustained as long. Over weeks and months, Zone 2 also improves fat oxidation capacity, making your body more efficient at using fat for fuel even at rest. Combined with a calorie deficit, it is very effective for fat loss.

What heart rate monitor is best for Zone 2 training?

A chest strap monitor (Garmin, Polar, Wahoo) is most accurate for heart rate measurement, especially during variable-intensity activities. Optical wrist monitors in smartwatches are convenient and adequate for steady-state Zone 2 work but less accurate during intensity changes. For running where heart rate can drift, a chest strap is worth using if Zone 2 precision matters to you.

Not medical advice. Heart rate zones are estimates based on population averages. Actual zones vary between individuals. If you have a cardiovascular condition or are new to exercise, consult a doctor before starting a training program.