To calculate your heart rate, place two fingers on your wrist or neck, count the beats for 15 seconds, and multiply by 4. That gives you your beats per minute (bpm). For most adults, a normal resting heart rate falls between 60 and 100 bpm, though active people often sit closer to the lower end of that range.
But “heart rate” can mean several different things depending on what you’re trying to figure out. Your resting rate, your maximum rate, your target training zone, and your recovery rate are all calculated differently and tell you different things about your cardiovascular fitness.
How to Check Your Pulse Manually
You can feel your pulse at two easy-to-find spots: the radial artery on the inside of your wrist (just below the base of your thumb) and the carotid artery on the side of your neck (in the soft groove beside your windpipe). Use your index and middle fingers, not your thumb, since your thumb has its own pulse that can throw off the count.
Press lightly until you feel a steady beat, then count the number of beats over a set time window. The simplest method is counting for 15 seconds and multiplying by 4. If you count 18 beats in 15 seconds, your heart rate is 72 bpm. You can also count for 30 seconds and multiply by 2, which tends to be slightly more accurate since it smooths out any irregularities in rhythm. A full 60-second count is the most precise option, but most people find 15 or 30 seconds practical enough.
For the most accurate resting heart rate, measure first thing in the morning before getting out of bed. Caffeine, stress, a hot room, or even standing up recently can all push the number higher than your true baseline.
Normal Resting Heart Rate by Age
Resting heart rate varies dramatically across the lifespan. Newborns run between 100 and 205 bpm, which sounds alarmingly fast but is completely normal for a tiny heart pumping a small volume of blood. The rate gradually slows as children grow:
- Newborn (birth to 4 weeks): 100 to 205 bpm
- Infant (4 weeks to 1 year): 100 to 180 bpm
- Toddler (1 to 3 years): 98 to 140 bpm
- Preschool (3 to 5 years): 80 to 120 bpm
- School age (5 to 12 years): 75 to 118 bpm
- Adolescent (13 to 17 years): 60 to 100 bpm
- Adult (18+): 60 to 100 bpm
These ranges apply when you’re awake and at rest. Sleep typically brings the rate lower, and any physical activity pushes it higher.
Why Athletes Have Lower Resting Rates
Highly trained endurance athletes can have resting heart rates well below the standard 60 bpm floor. A study of 465 endurance athletes found that 38% had a minimum heart rate at or below 40 bpm, and about 2% dropped to 30 bpm or lower. This isn’t a sign of a problem. Regular aerobic training strengthens the heart muscle so it pumps more blood per beat, meaning it doesn’t need to beat as often to circulate the same volume.
If you’re physically active and your resting rate sits in the 40s or 50s with no symptoms like dizziness or fainting, that’s generally a sign of good cardiovascular conditioning rather than something to worry about.
How to Calculate Maximum Heart Rate
Your maximum heart rate is the fastest your heart can beat during all-out exertion. You need this number to figure out your training zones. Two formulas are commonly used to estimate it.
The classic formula, developed by Fox and colleagues in 1971, is straightforward: 220 minus your age. A 40-year-old gets a max of 180 bpm. It’s easy to remember, which is why it’s printed on gym posters everywhere, but it tends to overestimate max heart rate in younger people and underestimate it in older adults.
A more refined formula from Tanaka and colleagues gives slightly better accuracy across age groups: 208 minus (0.7 × your age). For that same 40-year-old, this works out to 180 bpm (the two formulas converge around age 40). But for a 25-year-old, Fox predicts 195 while Tanaka predicts 190.5. For a 65-year-old, Fox gives 155 while Tanaka gives 162.5. The gap widens the further you get from middle age.
Both formulas are estimates with a margin of error of roughly 10 to 12 bpm in either direction. If you want a precise number, the only way to get one is a graded exercise test in a clinical or sports performance setting.
Calculating Your Target Training Zone
Once you have your estimated maximum heart rate, you can set training zones based on percentages of that number. A common framework breaks exercise into two tiers: moderate intensity at 50% to 70% of your max, and vigorous intensity at 70% to 85%.
For a 35-year-old using the classic formula (max of 185 bpm), moderate exercise means keeping your heart rate between about 93 and 130 bpm. Vigorous exercise falls between 130 and 157 bpm. These ranges give you a concrete target to aim for during a workout rather than relying on feel alone.
Heart Rate Reserve for More Precision
The basic percentage method ignores one important variable: your resting heart rate. Two people the same age can have very different fitness levels, and their resting rates reflect that. The heart rate reserve method, sometimes called the Karvonen formula, accounts for this difference.
The calculation has three steps. First, find your heart rate reserve by subtracting your resting heart rate from your maximum heart rate. If your max is 185 and your resting rate is 60, your reserve is 125. Second, multiply that reserve by the intensity percentage you’re targeting. At 70% intensity, that’s 125 × 0.70 = 87.5. Third, add your resting heart rate back: 87.5 + 60 = 147.5 bpm.
This method is more personalized because it reflects your actual fitness. Someone with a resting rate of 80 using the same formula would get a different target (125 × 0.70 = 87.5, plus 80 = 167.5), even at the same age. In cardiac rehabilitation programs, patients typically aim for 60% to 80% of heart rate reserve plus their resting rate.
What Heart Rate Recovery Tells You
How quickly your heart rate drops after intense exercise is one of the simplest indicators of cardiovascular health. The calculation is just your peak heart rate during exercise minus your heart rate one minute after you stop.
If you hit 170 bpm at the end of a hard effort and you’re down to 148 bpm after one minute of rest, your heart rate recovery is 22 bpm. A recovery of 18 beats or more after one minute is generally considered good. A slower recovery can signal that your cardiovascular system is working harder than it should to return to baseline. Tracking this number over weeks or months of training is a useful way to see whether your fitness is improving, since recovery speed tends to get faster as your conditioning improves.
What Can Throw Off Your Numbers
Several things can make your heart rate higher or lower than expected, which matters when you’re trying to use any of these calculations. Caffeine and other stimulants speed up the heart and increase the force of each beat. This includes not just coffee but also ADHD medications like amphetamines and methylphenidate, certain pre-workout supplements, and weight-loss products that contain synthetic stimulants. Some of these supplements contain compounds with side effects as serious as chest pain and palpitations.
On the other side, medications that slow the heart rate, most commonly beta-blockers prescribed for high blood pressure or anxiety, will push your resting and exercise heart rates well below what the standard formulas predict. If you take a beta-blocker and try to hit 70% of your age-predicted max, you may never get there no matter how hard you push. In that case, the percentage-based formulas become unreliable, and perceived exertion (how hard the effort feels on a scale of 1 to 10) is a more practical guide.
Dehydration, illness, poor sleep, high ambient temperature, and emotional stress all temporarily raise resting heart rate too. If your number seems unusually high on a given day, consider what else is going on before jumping to conclusions.