Heart Rate Zone Calculator: Find Your Max HR and Training Zones
Use this free heart rate zone calculator to find your maximum heart rate and the exact beats-per-minute range for each of the 5 training zones. Enter your age (and your resting heart rate for the most accurate Karvonen method) and choose your goal. You will get your personal zones for fat burning, endurance and performance, plus a pulse-count guide you can use without a watch.
Your 5 heart rate training zones
Estimates only. Individual heart rates vary by about 10-12 bpm from formulas. Medications such as beta blockers change heart rate, so ask your doctor.
What Are Heart Rate Zones?
Heart rate zones are ranges of heartbeats per minute (bpm) that match different training intensities, expressed as a percentage of your maximum heart rate. Training in different zones produces different results: easy zones build your aerobic base and speed recovery, while hard zones improve speed and power.
Most coaches, watches and apps use a 5-zone model. Zones are personal, so a 25-year-old and a 55-year-old will have very different bpm ranges for the same effort.
How to Calculate Your Maximum Heart Rate
Your maximum heart rate (MHR) is the highest number of beats per minute your heart can reach during all-out effort. The most accurate way to know it is a supervised stress test. Without one, use a formula:
Classic: MHR = 220 - age
Gulati (women): MHR = 206 - (0.88 x age)
| Formula | Best for | Notes |
|---|---|---|
| Tanaka | Most adults, especially over 40 | Based on a large analysis of studies and more accurate for older adults than 220 - age |
| 220 - age | Quick estimate | The most famous formula, but it can be off by 10-12 bpm for many people |
| Gulati | Women | Developed from a study of women and often gives a higher result than 220 - age |
| Measured | Trained athletes | Use your highest recorded heart rate from a hard, well-paced effort or a lab test |
Karvonen Method vs Percent of Max
Percent of max simply multiplies your max heart rate by each zone percentage. It is quick, but it ignores how fit you are.
The Karvonen method uses your heart rate reserve (the gap between max and resting heart rate), so fitter people with lower resting rates get zones adjusted to their fitness.
Target HR = (heart rate reserve x intensity %) + resting HR
If you know your resting heart rate, Karvonen is usually the more personal option.
The 5 Heart Rate Zones Explained
| Zone | Intensity | How it feels | Main benefit |
|---|---|---|---|
| Zone 1: Very light | 50-60% | Easy breathing, can chat or sing | Warm-up, cool-down and active recovery |
| Zone 2: Light | 60-70% | Comfortable, can hold a full conversation | Builds aerobic base and fat-burning efficiency |
| Zone 3: Moderate | 70-80% | Slightly breathless, short sentences | Improves aerobic fitness and stamina |
| Zone 4: Hard | 80-90% | Heavy breathing, only a few words | Raises lactate threshold and race pace |
| Zone 5: Maximum | 90-100% | All-out, cannot talk | Boosts top speed and power, only for short bursts |
Which Zone Is Best for Fat Loss?
Zone 2 is often called the "fat-burning zone" because a higher percentage of calories burned comes from fat at lower intensity. But what matters most for weight loss is total calories burned and your overall calorie deficit. Higher-intensity zones burn more calories per minute, while Zone 2 is easier to sustain for longer and to recover from.
A smart plan for most people combines both: several longer, easy Zone 2 sessions each week, plus one or two shorter interval sessions in Zones 4 and 5, along with a moderate calorie deficit and strength training.
Target Heart Rate by Age (50-85% of Max)
The American Heart Association's general guideline for target heart rate during exercise is 50% to 85% of your max heart rate. It uses the classic 220 - age formula:
| Age | Max heart rate | Target zone (50-85%) |
|---|---|---|
| 20 | 200 bpm | 100-170 bpm |
| 25 | 195 bpm | 98-166 bpm |
| 30 | 190 bpm | 95-162 bpm |
| 35 | 185 bpm | 93-157 bpm |
| 40 | 180 bpm | 90-153 bpm |
| 45 | 175 bpm | 88-149 bpm |
| 50 | 170 bpm | 85-145 bpm |
| 55 | 165 bpm | 83-140 bpm |
| 60 | 160 bpm | 80-136 bpm |
| 65 | 155 bpm | 78-132 bpm |
| 70 | 150 bpm | 75-128 bpm |
What Is a Normal Resting Heart Rate?
For most adults, a normal resting heart rate is 60 to 100 beats per minute. Well-trained endurance athletes can have resting rates of 40 to 60 bpm. A lower resting heart rate generally suggests a more efficient heart, and it often falls as your fitness improves. If your resting rate is consistently above 100 bpm, or you have symptoms such as dizziness, chest pain or fainting, see a doctor.
How to Measure Your Heart Rate
- Chest strap: the most accurate consumer option, especially for intervals.
- Wrist-based watch or band: convenient and good for steady efforts, though it can lag during fast changes or in cold weather.
- Manual pulse: place two fingers on your wrist or neck, count for 10 seconds and multiply by 6. The "10-sec count" column in the results helps you check this.
- Talk test: if you can talk comfortably you are in Zones 1-2, if you can say a few words you are in Zone 3-4, and if you cannot talk you are in Zone 5.
Frequently Asked Questions About Heart Rate Zones
What is a good heart rate zone for weight loss?
Zone 2 (about 60-70% of max) is great for long, sustainable fat-burning sessions. Adding one or two higher-intensity interval sessions in Zones 4-5 burns more calories in less time. Your overall calorie deficit matters most.
How do I calculate my max heart rate?
Use 208 - (0.7 x age) for most adults, or 220 - age as a quick estimate. A real max effort or a supervised stress test is more accurate, because individual maximums can differ by 10 or more bpm.
Is 220 minus age accurate?
It is a rough guide. It works as a starting point but can be off by 10-12 bpm for many people, and it tends to underestimate max heart rate in older adults. The Tanaka formula is generally more accurate.
What heart rate is too high during exercise?
Going above your estimated max for brief moments is not necessarily dangerous, but if you feel chest pain, dizziness, severe shortness of breath or palpitations, stop and seek medical advice. Check with a doctor if you have a heart condition.
Why is my heart rate high even at easy pace?
Heat, dehydration, caffeine, stress, poor sleep, illness, or being new to training can all raise heart rate at a given pace. It usually falls as your fitness improves.
Do heart rate zones change with fitness?
Your max heart rate stays about the same, but your resting heart rate usually drops as you get fitter. With the Karvonen method, your zones adjust when your resting rate changes.
How much time should I spend in each zone?
A common approach, called polarized training, spends roughly 80% of weekly training time in Zones 1-2 and 20% in Zones 4-5, with less time in Zone 3. Beginners can start with mostly Zone 2.
Disclaimer: This calculator is for educational purposes only and is not medical advice. Consult a doctor before starting a new exercise program, especially if you have a heart condition, high blood pressure, are pregnant, take heart-rate-altering medication, or experience chest pain, dizziness or unusual shortness of breath.
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