A normal resting heart rate for adults falls between 60 and 100 beats per minute (bpm). That’s your heart rate when you’re awake, calm, and sitting still. Where you land within that range depends on your fitness level, age, medications, and even the time of day. Well-trained athletes can have resting rates as low as 40 bpm, which is perfectly healthy for them.
Normal Ranges by Age
Children’s hearts beat considerably faster than adults’. A newborn’s heart can race between 85 and 205 bpm while awake, which would signal a medical emergency in a grown adult but is completely normal for a baby. As children grow, the range gradually narrows and slows:
- Newborn to 3 months: 85 to 205 bpm awake, 80 to 160 bpm asleep
- 3 months to 2 years: 100 to 190 bpm awake, 75 to 160 bpm asleep
- 2 to 10 years: 60 to 140 bpm awake, 60 to 90 bpm asleep
- Over 10 years and adults: 60 to 100 bpm awake, 50 to 90 bpm asleep
By the time a child reaches about 10 years old, their resting heart rate settles into the same general range as an adult’s.
What Makes Your Heart Rate Go Up or Down
Your nervous system constantly adjusts your heart rate in response to what’s happening around you and inside your body. When you feel stressed, startled, or anxious, your fight-or-flight response kicks in and drives your heart rate up so your muscles can receive more blood and oxygen. When you’re relaxed, your heart slows down because demand is lower.
Beyond stress, several everyday factors shift your heart rate in either direction. Caffeine, dehydration, heat, illness, and fever all tend to push it higher. Certain medications, including beta-blockers and some blood pressure drugs, pull it lower. Even body position matters: standing up briefly raises your heart rate compared to lying down, because your heart has to work against gravity to pump blood to your brain.
How Your Heart Rate Changes During Sleep
Your heart doesn’t beat at one steady pace all night. Within about five minutes of falling asleep, it begins to slow as you enter light sleep. During deep sleep, it drops even further, typically 20% to 30% below your normal resting rate. For someone with a resting rate of 70 bpm, that means deep sleep could bring it down into the high 40s or low 50s.
During REM sleep, the stage where most vivid dreaming occurs, things get more unpredictable. Your heart rate mirrors whatever is happening in your dream. A nightmare or a dream about running can push your heart rate up as though you were actually awake and active. This variability throughout the night is normal and healthy.
Why Athletes Have Lower Resting Rates
Regular cardiovascular exercise strengthens the heart muscle, allowing it to pump more blood with each beat. A stronger heart doesn’t need to beat as often to deliver the same amount of blood to the body, so the resting rate drops. Endurance athletes often sit around 40 to 60 bpm at rest. A lower resting heart rate generally signals better cardiovascular fitness, and for most people, a rate on the lower end of the normal range is a positive sign.
When a Heart Rate Is Too Fast or Too Slow
Clinically, a resting heart rate below 60 bpm is called bradycardia, and a rate above 100 bpm is called tachycardia. But crossing those thresholds doesn’t automatically mean something is wrong. A fit person with a rate of 52 bpm likely has an efficient heart. Someone who just had a cup of coffee and walked up stairs might clock 105 bpm and be fine minutes later.
The concern is when an unusual rate persists at rest without an obvious explanation, or when it comes with symptoms. Dizziness, fainting, chest pain, shortness of breath, or a fluttering sensation in your chest alongside an abnormal rate are worth paying attention to. A heart that consistently beats above 120 bpm at rest could indicate an abnormal rhythm that needs evaluation.
What a Normal Heart Rhythm Looks Like
Rate and rhythm are two different things. You can have a normal rate but an irregular rhythm, or vice versa. A healthy heart follows a pattern called normal sinus rhythm, meaning the electrical signal starts in the right place (a cluster of cells at the top of the heart called the sinus node) and travels through the heart in the correct sequence.
On an ECG, this shows up as a consistent repeating pattern: a small bump (the P wave, representing the upper chambers contracting), a brief pause, a sharp spike (the QRS complex, when the lower chambers contract), and then a gentle wave as the heart resets. The spacing between these signals is regular, with the pause between the initial bump and the spike lasting between 0.12 and 0.20 seconds. When the spacing is erratic or portions of the pattern are missing, it can point to rhythm problems even if the overall rate looks normal.
How to Check Your Own Heart Rate
The two easiest places to feel your pulse are the inside of your wrist (on the thumb side) and the side of your neck, just below the jawline. Place two fingers gently on one of these spots. Don’t use your thumb, since it has its own pulse that can confuse your count.
For the most accurate reading, count the beats for a full 60 seconds. If you’re in a hurry, count for 15 seconds and multiply by four, though this is slightly less precise. Take your measurement first thing in the morning before getting out of bed, or after sitting quietly for at least five minutes. Checking right after exercise, coffee, or a stressful phone call will give you a number that doesn’t reflect your true resting rate.
Target Heart Rate During Exercise
Your maximum heart rate is the ceiling your heart can reach during intense physical activity. A commonly used estimate: multiply your age by 0.7 and subtract that number from 208. For a 40-year-old, that works out to about 180 bpm.
From there, exercise guidelines break intensity into two zones. Moderate exercise (a brisk walk, casual cycling) puts you at 50% to 70% of your max. Vigorous exercise (running, competitive sports) pushes you to 70% to 85% of your max. For that same 40-year-old with a max of 180 bpm, moderate exercise means a target of roughly 90 to 126 bpm, and vigorous exercise means roughly 126 to 153 bpm.
A more personalized approach factors in your resting heart rate. Subtract your resting rate from your maximum to get your heart rate reserve, then calculate your target zone as a percentage of that reserve, adding your resting rate back in. This method accounts for individual fitness levels and gives a more tailored range, especially useful if your resting rate is on the higher or lower end of normal.