A normal resting heart rate for adults falls between 60 and 100 beats per minute (bpm). That range applies when you’re sitting or lying down but awake. Your actual number within that range depends on your age, sex, fitness level, medications, and even the time of day.
Normal Heart Rate by Age
Hearts beat much faster in babies and young children, then gradually slow as the body grows. Newborns up to 3 months old have an awake heart rate between 85 and 205 bpm, which drops to 80 to 160 bpm during sleep. From 3 months to 2 years, the awake range narrows to 100 to 190 bpm, with sleeping rates between 75 and 160 bpm.
Children ages 2 to 10 settle into a range of 60 to 140 bpm while awake and 60 to 90 bpm while sleeping. By age 10, most kids reach the adult standard of 60 to 100 bpm during the day. These pediatric ranges are wide because a child’s heart rate responds dramatically to crying, fever, and activity, so a single reading outside the range isn’t necessarily a problem.
Why Athletes Often Run Lower
Well-trained endurance athletes routinely have resting heart rates in the 40s or 50s, and some go even lower. In a study of 465 endurance athletes, 38% had a minimum heart rate at or below 40 bpm on a 24-hour monitor. A small number, about 2%, dipped to 30 bpm or below. This happens because regular aerobic training strengthens the heart muscle so it pumps more blood per beat, requiring fewer beats to circulate the same volume.
The traditional explanation is that training alone reshapes the heart’s electrical pacing. But newer research from the American Heart Association shows genetics play an independent role. Certain inherited traits predict who will develop a slower heart rate with training, and those same genetic markers influence how much the heart physically remodels in response to exercise. In other words, some people are genetically wired to both excel at endurance sports and develop very low resting rates. If you’re active and feel fine, a rate in the low 50s or even 40s is usually a sign of cardiovascular efficiency rather than a problem.
Differences Between Men and Women
Women tend to have slightly faster resting heart rates than men. On average, the female resting rate is about 79 bpm compared to roughly 74 bpm in men, a difference of around 6%. The reason is partly structural: women’s hearts are generally smaller and pump less blood per beat, so the heart compensates by beating more frequently to maintain the same overall blood flow. Hormonal differences also play a role. Testosterone affects the timing of the heart’s electrical cycle in ways that contribute to the lower rate seen in men.
What Affects Your Resting Heart Rate
Your resting rate isn’t fixed. It shifts throughout the day and responds to a long list of influences. Caffeine, stress, dehydration, and illness can all push it higher. Certain medications have a direct effect: beta-blockers, commonly prescribed for high blood pressure and heart conditions, work by blocking the hormones that speed up the heart, which lowers your resting rate noticeably. Stimulant medications and some asthma drugs can raise it.
Temperature matters too. A hot environment or a fever will increase your heart rate as your body works harder to cool itself. Emotional states like anxiety or excitement trigger your fight-or-flight response, releasing adrenaline and temporarily driving the rate up. Even body position plays a role. Standing raises your heart rate compared to sitting, and sitting raises it compared to lying down.
Heart Rate During Sleep
Your heart rate naturally drops while you sleep, typically running about 20% to 30% lower than your daytime resting rate. For someone with a waking rate of 70 bpm, that means a sleeping rate somewhere around 49 to 56 bpm. This dip is normal and reflects reduced demand on your cardiovascular system as your body enters recovery mode. The lowest rates usually occur during deep sleep, with slight increases during REM stages when your brain is more active.
When a Heart Rate Is Too High
A resting heart rate consistently above 100 bpm is called tachycardia. It can feel like a racing, pounding, or fluttering sensation in the chest. Other symptoms include shortness of breath, lightheadedness, dizziness, and in some cases fainting. Tachycardia has many possible causes, from anxiety and caffeine to thyroid problems and heart rhythm disorders. A temporarily elevated rate after exercise, stress, or coffee isn’t concerning, but a resting rate that stays above 100 without an obvious reason is worth investigating.
When a Heart Rate Is Too Low
A heart rate below 60 bpm is classified as bradycardia. For fit individuals, this is almost always harmless. It becomes a concern when the heart beats too slowly to pump enough oxygen-rich blood to the brain and body. Signs of problematic bradycardia include unusual fatigue (especially during physical activity), dizziness, confusion, memory problems, chest pain, and fainting. If a low heart rate causes no symptoms and you’re otherwise healthy, it generally doesn’t require treatment.
How to Check Your Heart Rate
The simplest method requires no equipment. Place the tips of your index and middle fingers on the inside of your wrist, just below the base of your thumb. Press gently until you feel a pulse. Count the beats for a full 60 seconds for the most accurate result, or count for 15 seconds and multiply by four. Avoid using your thumb, which has its own pulse and can throw off the count.
You can also check at the side of your neck, just below the jawline. For ongoing tracking, wrist-based fitness trackers and smartwatches use optical sensors to estimate heart rate continuously. These devices are reasonably accurate for resting measurements, though they can struggle during vigorous exercise or if the band is too loose. For the most reliable resting reading, check your pulse first thing in the morning before getting out of bed, when your body is closest to a true baseline.