A normal resting heart rate for adults falls between 60 and 100 beats per minute (bpm). That range applies when you’re awake, calm, and sitting still. Where you land within it depends on your fitness level, age, medications, and what’s happening in your body at that moment.
Resting Heart Rate by Age
Hearts beat faster in smaller bodies. A newborn’s resting heart rate runs between 100 and 160 bpm, which would signal a serious problem in an adult but is completely normal for an infant. As children grow, the range narrows gradually:
- Newborn (0 to 1 month): 100 to 160 bpm
- Infant (1 to 12 months): 80 to 140 bpm
- Toddler (1 to 3 years): 80 to 130 bpm
- Preschool (3 to 5 years): 80 to 110 bpm
- School age (6 to 12 years): 70 to 100 bpm
- Adolescents and adults: 60 to 100 bpm
By the teen years, the heart settles into the same 60 to 100 range it will keep for the rest of adulthood. There’s no separate “senior” range in current guidelines, though older adults often see a slight upward drift due to changes in heart muscle stiffness and blood vessel health.
Why Lower Is Generally Better
Within that 60 to 100 window, a lower resting heart rate usually signals a more efficient heart. When the heart pumps a larger volume of blood with each beat, it doesn’t need to beat as often to keep up with demand. Regular aerobic exercise is the most reliable way to push your resting rate downward over time.
Well-trained athletes routinely sit between 40 and 60 bpm at rest. A study of 142 elite cyclists and rowers recorded heart rates spanning 30 to 70 bpm. Researchers have found that this “athlete’s bradycardia” isn’t simply the result of the nervous system slowing things down. The heart’s pacemaker cells physically remodel in response to endurance training, changing how they generate electrical signals. The heart literally adapts its wiring to beat more efficiently.
What Counts as Too Fast or Too Slow
A resting heart rate above 100 bpm is classified as tachycardia. Below 60 bpm is technically bradycardia, though in a fit person this is normal and expected. Context matters more than the number alone.
Tachycardia at rest can feel like your heart is racing, pounding, or fluttering in your chest. It sometimes shows up with lightheadedness or a sense that something is off. Causes range from temporary and harmless (caffeine, anxiety, dehydration) to conditions that need treatment (thyroid disorders, anemia, heart rhythm problems). A heart rate that regularly exceeds 120 bpm at rest, without an obvious trigger like exercise or stress, is worth getting checked.
Bradycardia is only a concern when it causes symptoms. If your resting rate sits in the 50s and you feel fine, that’s typically a sign of good cardiovascular fitness. But if a slow heart rate comes with dizziness, fatigue, fainting, or confusion, the heart may not be pumping enough blood to meet your body’s needs.
Your Heart Rate During Exercise
During a workout, your heart rate should climb well above its resting baseline. How high depends on your age and the intensity you’re aiming for. The classic formula for estimating your maximum heart rate is simple: subtract your age from 220. A 40-year-old, for example, gets a max of about 180 bpm. A slightly more accurate version, developed by researcher Hirofumi Tanaka, uses 208 minus 0.7 times your age, which gives that same 40-year-old a max of 180 as well (the two formulas diverge more at younger and older ages).
From there, exercise intensity breaks into two main zones:
- Moderate intensity: 50% to 70% of your maximum heart rate. For a 40-year-old, that’s roughly 90 to 126 bpm. This is a brisk walk, easy bike ride, or casual swim.
- Vigorous intensity: 70% to 85% of your maximum. For that same 40-year-old, roughly 126 to 153 bpm. This is running, cycling uphill, or a fast-paced group fitness class.
These are estimates, not hard boundaries. If you’re on blood pressure medication, for instance, your heart rate response to exercise may be blunted, and the zones won’t match up the same way. Perceived effort (how hard the exercise feels) is a useful backup gauge.
What Makes Your Heart Rate Fluctuate
Your resting heart rate isn’t a fixed number. It shifts throughout the day and from one day to the next based on a range of factors. Caffeine increases sympathetic nervous system activity, which can raise both heart rate and blood pressure. About 300 mg of caffeine (roughly two to three cups of coffee) has been shown to raise systolic blood pressure by about 7 points within an hour, and your heart rate often ticks up alongside it.
Stress and anxiety trigger the same fight-or-flight pathways. Cold temperatures force the heart to work harder to maintain core body temperature, which can push rates upward. Nicotine has a similar effect, narrowing blood vessels and making the heart compensate by pumping faster. Dehydration, fever, and poor sleep all nudge the number higher too. Even body position matters: your heart rate is typically a few beats lower when you’re lying down compared to standing.
Because of all these variables, the most consistent way to track your resting heart rate is to measure it first thing in the morning, before getting out of bed, on several consecutive days.
How to Check Your Heart Rate
You can measure your pulse at two easy-to-find spots. The wrist (radial artery) is the most common: place your index and middle fingers on the thumb side of your inner wrist, just below the base of your hand. The neck (carotid artery) works too: press lightly on either side of your windpipe, just below the jawline. Avoid pressing hard on the neck, as that can sometimes trigger a reflex that slows the heart and gives you a falsely low reading.
For the most accurate count, time yourself for a full 60 seconds. A shortcut is to count for 15 seconds and multiply by four, but this amplifies any counting errors. If you count one beat too many in a 15-second window, your result is off by four. Wearable devices and smartwatches offer continuous tracking, which is convenient for spotting trends over time, though they can be less accurate during movement or if the band is loose.
Warning Signs That Need Attention
An unusual heart rate on its own is rarely an emergency. What matters is what comes with it. Chest pain, shortness of breath, or fainting alongside a fast or irregular heartbeat are red flags that warrant immediate medical care. A sudden collapse with no pulse or breathing can signal ventricular fibrillation, a dangerous rhythm where the heart quivers instead of pumping, and requires calling emergency services right away.
Less urgent but still worth discussing with a doctor: a resting heart rate that consistently runs above 100 without a clear cause, a new pattern of skipped or extra beats, or episodes where your heart suddenly races and then stops just as abruptly. These patterns can point to rhythm disorders that are very treatable once identified.