A target heart rate range is the ideal number of heartbeats per minute you should aim for during exercise. It’s typically between 50% and 85% of your maximum heart rate, and staying within it helps you get the most benefit from a workout without pushing too hard. Think of it as the sweet spot between coasting and overexerting yourself.
How Your Target Range Is Calculated
The simplest and most widely used formula starts with the number 220 minus your age. That gives you an estimated maximum heart rate. A 40-year-old, for example, has an estimated max of 180 beats per minute (bpm). Your target range is then a percentage of that number, depending on how hard you want to work.
The American Heart Association defines two main intensity levels:
- Moderate intensity: 50% to 70% of your maximum heart rate
- Vigorous intensity: 70% to 85% of your maximum heart rate
So for that 40-year-old with a max of 180, a moderate workout means keeping their heart rate between 90 and 126 bpm. A vigorous workout would be 126 to 153 bpm.
Target Ranges by Age
Here’s how the numbers break down across age groups, based on American Heart Association guidelines:
- Age 20: Max 200 bpm, target range 100 to 170 bpm
- Age 30: Max 190 bpm, target range 95 to 162 bpm
- Age 40: Max 180 bpm, target range 90 to 153 bpm
- Age 50: Max 170 bpm, target range 85 to 145 bpm
- Age 60: Max 160 bpm, target range 80 to 136 bpm
- Age 70: Max 150 bpm, target range 75 to 128 bpm
These ranges are broad because they span from moderate to vigorous effort. If you’re just starting out, aim for the lower end. As your fitness improves, you can safely push higher within the range.
A More Personalized Calculation
The basic 220-minus-age formula works as a quick estimate, but it ignores your resting heart rate, which varies significantly from person to person. A more personalized approach uses something called heart rate reserve. You subtract your resting heart rate from your estimated maximum, apply your desired intensity percentage, then add the resting heart rate back.
For example, a 30-year-old with a resting heart rate of 70 bpm who wants to exercise at 60% intensity would calculate it like this: 220 minus 30 gives a max of 190. Subtract the resting rate of 70 to get a heart rate reserve of 120. Multiply by 0.60 to get 72, then add the resting rate back: 142 bpm. The American College of Sports Medicine recommends exercising at 60% to 80% of heart rate reserve, so this person would also calculate the 80% end to find their full personalized range.
This method matters because two people the same age can have very different resting heart rates. Someone with a resting rate of 55 bpm is in a different cardiovascular starting place than someone at 80 bpm, and their target zones should reflect that.
Why the Target Range Matters
Staying in your target range helps you hit specific fitness goals. At the lower end (50% to 70% of max), your body primarily burns fat for fuel and builds aerobic endurance. This is the intensity of a brisk walk or easy jog. At the higher end (70% to 85%), you’re improving cardiovascular capacity, increasing your VO2 max, and building the kind of fitness that makes everyday activities feel easier over time.
Federal health guidelines recommend at least 150 minutes of moderate-intensity exercise per week, or 75 minutes of vigorous-intensity activity. Using your target heart rate range is one of the most reliable ways to confirm you’re actually hitting those intensities rather than guessing.
Doctors also use target heart rate during cardiac stress tests, where they monitor how your heart responds as it’s pushed toward a specific percentage of its maximum. The same concept that helps you plan a workout also helps clinicians evaluate heart function.
How to Track It Without a Monitor
If you don’t have a heart rate monitor, you can use perceived exertion. The most common tool is the Borg scale, which rates effort from 6 (no exertion at all) to 20 (absolute maximum). A score of 12 to 14 corresponds roughly to moderate intensity, the kind of effort where you’re breathing harder but can still carry on a conversation. A simpler version, the modified Borg scale, runs from 0 to 10, where 4 to 5 is moderate and 6 to 7 is vigorous.
The talk test is even simpler. If you can talk but not sing during exercise, you’re likely in the moderate zone. If you can only get out a few words before needing a breath, you’re in vigorous territory.
How Accurate Are Wearable Monitors
Chest strap monitors remain the gold standard for accuracy. In a study comparing several commercial devices against a medical-grade ECG, the Polar H7 chest strap showed 98% agreement. Wrist-worn optical sensors performed well at lower intensities but lost accuracy as exercise intensity increased. At high speeds on a treadmill (8 to 9 mph), none of the wrist-worn devices tested maintained strong agreement with the ECG reading.
For most people doing moderate workouts, a wrist-worn tracker gives a useful ballpark. But if you’re doing high-intensity interval training or need precise data for a training plan, a chest strap is more reliable.
When Standard Formulas Don’t Apply
Certain medications, particularly beta-blockers used for high blood pressure and heart conditions, lower your heart rate at rest and during exercise. Research shows beta-blockers can reduce resting heart rate by about 15 bpm and suppress maximum heart rate by roughly 19 bpm. That makes the standard percentage-based formulas unreliable. If your heart rate is being artificially held down by medication, hitting “70% of max” may actually represent a much harder effort than it would for someone not on that medication.
For people on heart rate-lowering medications, perceived exertion scales are a better guide than heart rate numbers alone. Your doctor or an exercise physiologist can also set adjusted targets based on exercise testing rather than age-based estimates.
Age-based formulas also have inherent limitations. The 220-minus-age equation was developed as a population average, meaning individual variation can be significant. Some people naturally have a maximum heart rate 10 to 15 beats above or below the predicted number. If you consistently feel like you’re barely working at your calculated target, or you feel completely wiped out, the formula may not be a great fit for your physiology. A graded exercise test, often done on a treadmill with ECG monitoring, gives the most accurate personal maximum.