Your fat burning heart rate zone is the exercise intensity range where your body uses a higher percentage of fat for fuel.
For many people, this zone is usually around{" "} 60–70% of maximum heart rate, often called{" "} Zone 2 cardio. It usually feels steady, controlled, and sustainable — you should be breathing faster than normal, but still able to speak in short sentences.
Training in this zone consistently is one of the most practical approaches to cardiovascular fitness and long-term fat loss — especially because it is sustainable enough to do regularly without overloading recovery. Use our{" "} Heart Rate Calculator to find your specific zones instantly.
How to calculate your fat burning heart rate zone
The most common method uses a simple maximum heart rate (MHR) estimate:
Estimated Maximum Heart Rate = 220 − your age
Your fat burning zone is approximately 60–70% of that number.
Fat burning zone lower limit = MHR × 0.60 Fat burning zone upper limit = MHR
× 0.70
Example: Age 35
MHR = 220 − 35 = 185 bpm Lower limit = 185 × 0.60 = 111 bpm Upper limit =
185 × 0.70 = 130 bpm
So a 35-year-old's estimated fat burning zone is approximately{" "} 111–130 bpm.
These are estimates. Actual maximum heart rate varies between individuals even at the same age, and the 220 minus age formula has a margin of error. But for most people, it gives a good enough starting point.
Fat burning heart rate zone by age — chart
| Age | Estimated MHR | Fat Burning Zone (60–70%) |
|---|---|---|
| 20 | 200 bpm | 120–140 bpm |
| 25 | 195 bpm | 117–137 bpm |
| 30 | 190 bpm | 114–133 bpm |
| 35 | 185 bpm | 111–130 bpm |
| 40 | 180 bpm | 108–126 bpm |
| 45 | 175 bpm | 105–123 bpm |
| 50 | 170 bpm | 102–119 bpm |
| 55 | 165 bpm | 99–116 bpm |
| 60 | 160 bpm | 96–112 bpm |
| 65 | 155 bpm | 93–109 bpm |
| 70 | 150 bpm | 90–105 bpm |
Heart rate zones explained
Most training systems divide exercise intensity into 5 zones based on percentage of maximum heart rate. The fat burning zone is Zone 2.
| Zone | % of MHR | How It Feels | Primary Fuel |
|---|---|---|---|
| Zone 1 | 50–60% | Very light, warm-up level | Fat |
| Zone 2 | 60–70% | Comfortable, conversational | Mostly fat |
| Zone 3 | 70–80% | Moderate, slightly breathless | Fat + carbs |
| Zone 4 | 80–90% | Hard, difficult to speak | Mostly carbs |
| Zone 5 | 90–100% | Maximum effort, unsustainable | Carbs (anaerobic) |
Why Zone 2 is called the "fat burning zone"
During low to moderate intensity exercise, your body relies more heavily on fat as a fuel source. At higher intensities, carbohydrates become the dominant fuel because they can be converted to energy faster.
This is why Zone 2 is labelled the fat burning zone — fat oxidation (fat being used for fuel) is relatively higher as a proportion of energy at this intensity. ( NCBI — Fat oxidation during exercise )
However, this does not mean Zone 2 burns more total calories than higher-intensity exercise. Higher-intensity exercise burns more calories per minute. The "fat burning zone" label refers to the fuel mix used during the session, not total fat loss.
Does the fat burning zone actually help with fat loss?
Yes — but with an important distinction.
The primary driver of fat loss is a sustained calorie deficit: burning more calories than you consume over time. Zone 2 cardio is useful for fat loss because:
- It is sustainable — you can do it for longer and more frequently without destroying recovery
- It burns calories, contributing to the weekly calorie deficit
- It supports cardiovascular health and aerobic base fitness
- It is accessible — walking, light cycling and slow jogging all count
Higher-intensity exercise burns more calories per minute — but it is harder to recover from, which often means fewer sessions per week for most people. For most people aiming to lose fat without specialised training, Zone 2 done consistently is extremely effective.
For more on how calorie deficit works and how to estimate your targets, read our article on{" "} how many calories should I eat per day .
Zone 2 cardio activities
Any activity that keeps your heart rate in the 60–70% MHR range qualifies as Zone 2 cardio. Common examples:
- Brisk walking (particularly effective for beginners and older adults)
- Light jogging or slow running
- Cycling at a moderate pace
- Swimming at a conversational pace
- Rowing machine at low to moderate resistance
- Elliptical at a steady, comfortable pace
- Dancing, hiking, or any sustained moderate activity
The key is that you should be able to hold a conversation throughout. If you cannot, you have likely moved into Zone 3 or higher.
How long and how often to train in Zone 2
A practical weekly Zone 2 plan for fat loss and cardiovascular health:
| Level | Sessions per Week | Duration per Session |
|---|---|---|
| Beginner | 2–3 | 20–30 minutes |
| Intermediate | 3–4 | 30–45 minutes |
| Advanced (aerobic base building) | 4–5 | 45–90 minutes |
Start where you are, not where you want to be. Consistency over weeks and months matters far more than any individual session.
How to monitor your heart rate during exercise
- Wearable monitor: Fitness trackers, smartwatches and chest straps provide real-time heart rate data. Chest straps are generally more accurate for exercise than wrist-based optical sensors.
- Manual check: Stop briefly, find your wrist or neck pulse, count beats for 15 seconds, multiply by 4.
- Talk test: A simple field test — if you can speak comfortably in short sentences, you are likely in Zone 1 or 2. If you can only say 2–3 words before needing a breath, you are likely in Zone 3–4.
- Rate of perceived exertion (RPE): Zone 2 feels like a 3–4 out of 10 — steady and manageable, not easy but not hard.
Heart rate zones and body fat
Understanding your heart rate zones works best alongside tracking body composition. If you want to see whether your training is improving your body fat percentage over time, check our{" "} Body Fat Calculator. For a full breakdown of what healthy body fat percentages look like, read our article on{" "} body fat percentage chart by age and gender .
What about high-intensity interval training (HIIT)?
HIIT alternates between short high-intensity efforts (Zone 4–5) and recovery periods (Zone 1–2). Research suggests HIIT can be effective for fat loss and cardiovascular fitness — sometimes more time-efficient than steady Zone 2 work. ( PubMed — HIIT and fat loss )
The practical takeaway: both Zone 2 steady cardio and higher-intensity work can contribute to fat loss. Zone 2 is more sustainable, easier to recover from, and appropriate for most people most of the time. HIIT can be added when you have a solid base fitness level and are looking to add intensity variety.
Frequently asked questions
What is the fat burning heart rate?
The fat burning heart rate is usually estimated at around 60–70% of your maximum heart rate. This is also commonly called Zone 2 cardio.
How do I calculate my fat burning heart rate?
Estimate your maximum heart rate using 220 minus your age. Then multiply by 0.60 and 0.70 to get your fat burning zone range.
What is the best heart rate to burn fat?
Around 60–70% of your maximum heart rate is a good target for sustained fat-burning exercise. However, total calorie balance and consistency over time matter more than any single zone.
Is Zone 2 cardio good for fat loss?
Yes. It is sustainable, easy to recover from, and accessible. Done consistently, it contributes meaningfully to a weekly calorie deficit and supports cardiovascular fitness.
What is a target heart rate calculator?
A target heart rate calculator estimates the heart rate range you should aim for during exercise based on your age and intended workout intensity. Our{" "} Heart Rate Calculator gives you all five training zones instantly.
Is a maximum heart rate calculator accurate?
It gives a useful estimate, but it is not perfectly accurate. Actual maximum heart rate varies between individuals even at the same age. The 220 minus age formula is a population average — your true max may be higher or lower.
What is the difference between fat burning zone and cardio zone?
The fat burning zone (Zone 2) usually refers to 60–70% of maximum heart rate. "Cardio zone" often refers to moderate to vigorous exercise around 70–85%, where carbohydrates become a larger fuel source.
How long should I stay in the fat burning zone?
A good starting point is 20–45 minutes per session, 3–5 times per week. Beginners can start with shorter sessions and build gradually.
What is a normal resting heart rate by age?
Adults commonly fall around 60–100 bpm at rest. Trained athletes may have resting heart rates of 40–60 bpm. For a full breakdown, read our article on{" "} resting heart rate by age.
If you want the bigger picture of how Zone 1 through Zone 5 fit together, see our beginner's guide to heart rate zones.