A healthy adult heart beats 60 to 100 times per minute at rest. Most people fall somewhere in the middle of that range, though your personal normal depends on your age, fitness level, and what’s happening in your body at any given moment. That number can climb well above 100 during exercise and drop below 60 during sleep.
Normal Resting Heart Rate by Age
Heart rate slows steadily as you grow from infancy into adulthood. A baby’s heart beats much faster because it’s smaller and needs to pump more frequently to circulate blood. Here’s what’s considered normal at rest:
- Infants (1 to 12 months): 80 to 140 beats per minute
- Toddlers (1 to 3 years): 80 to 130 beats per minute
- Preschoolers (3 to 5 years): 80 to 110 beats per minute
- School-age children (6 to 12 years): 70 to 100 beats per minute
- Adolescents and adults: 60 to 100 beats per minute
Those ranges are wide because “normal” varies a lot from person to person. A resting heart rate of 65 and one of 85 are both perfectly healthy for an adult. What matters more than a single reading is your personal baseline and whether it changes suddenly without an obvious reason.
What a Low or High Heart Rate Means
The traditional cutoffs are straightforward: a resting heart rate above 100 is considered fast (tachycardia), and below 60 is considered slow (bradycardia). However, those thresholds were set by medical convention decades ago and never formally tested. More recent analysis suggests the true normal range for adults is closer to 50 to 90 beats per minute, meaning a heart rate in the low 50s isn’t necessarily a problem, and a rate consistently in the mid-90s might deserve attention.
A heart rate below 60 is completely normal for people who are physically fit. Endurance athletes commonly have resting rates between 40 and 60 beats per minute. Studies of elite cyclists and rowers have recorded rates as low as 30. This happens because regular aerobic training physically remodels the heart’s natural pacemaker cells, making them fire more slowly. Each beat pumps more blood, so fewer beats are needed.
On the other end, a consistently elevated resting heart rate can signal dehydration, stress, an overactive thyroid, anemia, or other conditions worth investigating. A temporary spike from caffeine, excitement, or a hot day is normal and not a concern.
What Changes Your Heart Rate
Your heart rate responds to almost everything happening inside and around you. Body temperature is one of the biggest drivers. When your core temperature rises, whether from a fever, a hot bath, or a summer afternoon, your heart speeds up to help cool you down. Emotions have a similar effect. Stress, anxiety, excitement, sadness, and pain all raise your pulse, sometimes dramatically.
Caffeine increases heart rate in most people, though regular coffee drinkers often develop a tolerance. Nicotine does the same. On the other side, certain medications are designed to slow the heart. Beta blockers and calcium channel blockers, commonly prescribed for high blood pressure, can bring your resting rate down by 10 to 20 beats per minute or more.
Body position matters too. Your heart rate is typically a few beats higher when you’re standing than when you’re sitting, and lower still when you’re lying down. Dehydration forces the heart to work harder to maintain blood pressure, so even mild fluid loss can bump your rate up noticeably.
Heart Rate During Exercise
During physical activity, your heart rate is supposed to rise. How high it goes depends on how hard you’re working and your maximum heart rate, which is largely determined by age. The simplest estimate is 220 minus your age. A 40-year-old, for example, has an estimated maximum of about 180 beats per minute. A slightly more accurate formula, developed by researcher Hirofumi Tanaka, puts it at 208 minus 0.7 times your age, which gives that same 40-year-old a max of around 180 as well (the two formulas diverge more at older ages).
The American Heart Association uses these maximums to define exercise intensity zones. Moderate exercise, the kind that makes you breathe harder but still lets you hold a conversation, puts your heart at 50% to 70% of its maximum. For a 40-year-old, that’s roughly 90 to 126 beats per minute. Vigorous exercise pushes you to 70% to 85% of maximum, or about 126 to 153 beats per minute for the same person.
These zones are useful for gauging effort if you wear a heart rate monitor during workouts, but they’re estimates. Individual variation is significant, so treat them as guidelines rather than hard targets.
How to Check Your Pulse
You don’t need any equipment to count your heart rate. The two easiest spots to feel a pulse are your wrist and your neck. For your wrist, place the tips of your index and middle fingers on the thumb side, in the groove between the bone and the tendon. For your neck, press gently into the soft area beside your windpipe, just below your jawline. Use your fingertips, not your thumb, since your thumb has its own pulse that can throw off your count.
Once you feel a steady beat, count for a full 60 seconds while watching a clock. If you’re in a hurry, count for 15 seconds and multiply by four, though the full minute gives a more accurate reading. For the most reliable baseline, check your pulse first thing in the morning before getting out of bed, after you’ve been lying still for a few minutes.
Smartwatches and fitness trackers use optical sensors to measure heart rate continuously, which makes it easy to spot trends over days and weeks. If you notice your resting rate creeping up steadily over time, or suddenly jumping by 10 or more beats per minute without an obvious cause like illness or stress, that’s worth paying attention to. Tracking your heart rate over weeks gives you a much clearer picture of your cardiovascular health than any single reading.