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, and a handful of temporary factors like caffeine, stress, and hydration.
Normal Heart Rate by Age
Hearts beat faster in younger bodies. A newborn’s heart can race at 85 to 205 bpm while awake, which would be alarming in an adult but is perfectly normal for an infant. As children grow, the range gradually narrows and slows:
- Newborn to 3 months: 85 to 205 bpm awake, 80 to 160 bpm sleeping
- 3 months to 2 years: 100 to 190 bpm awake, 75 to 160 bpm sleeping
- 2 to 10 years: 60 to 140 bpm awake, 60 to 90 bpm sleeping
- Over 10 years and adults: 60 to 100 bpm awake, 50 to 90 bpm sleeping
By the time a child reaches about 10 years old, their resting heart rate settles into the same adult range and stays there for the rest of their life, barring illness or significant changes in fitness.
Why Athletes Have Much Lower Rates
Highly trained endurance athletes often have resting heart rates well below 60 bpm, and some dip below 40. In a study of 465 endurance athletes published in the American Heart Association’s journal Circulation, 38% had a minimum heart rate at or below 40 bpm on a 24-hour heart monitor. A small number, about 2%, dropped to 30 bpm or lower.
This happens because regular cardiovascular exercise physically changes the heart. The heart grows larger, fills with more blood per beat, and contracts more forcefully. Each beat pumps a greater volume, so the heart simply doesn’t need to beat as often to deliver the same amount of oxygen. The nervous system shifts too: the branch responsible for slowing the heart (the parasympathetic system) becomes more active, while the branch that speeds it up becomes less dominant. There’s also evidence that training changes the heart’s internal pacemaker cells at a molecular level, reducing their natural firing rate.
Some of this capacity appears to be genetic. Researchers have found that people who go on to become elite athletes often have lower heart rates even before they start intensive training, suggesting their hearts were primed for efficiency from the start.
When a Heart Rate Is Too Slow or Too Fast
Doctors use two specific thresholds to flag potential problems. A resting heart rate below 60 bpm is technically called bradycardia, and a rate above 100 bpm is called tachycardia. Neither number is automatically dangerous. A fit person sitting at 55 bpm is fine. A nervous patient in a doctor’s office hitting 105 bpm is probably just anxious.
What matters more than the number alone is whether you have symptoms. Bradycardia becomes a concern when it causes dizziness, fainting, unusual fatigue, or shortness of breath. Tachycardia is more likely to cause noticeable symptoms like a pounding chest, lightheadedness, or feeling winded at rest. Serious problems from a fast heart rate are uncommon when the rate stays below about 150 bpm in someone with a healthy heart.
What Temporarily Changes Your Heart Rate
Your resting heart rate isn’t a fixed number. It shifts throughout the day and from one day to the next. Caffeine, dehydration, anxiety, pain, poor sleep, and illness can all push it higher. Medications like decongestants and some asthma drugs tend to raise it, while beta-blockers and certain blood pressure medications lower it. Even ambient temperature plays a role: heat increases your heart rate as your body works harder to cool itself.
This is why consistency matters when you’re tracking your pulse. The most reliable reading comes first thing in the morning, before coffee, after a few minutes of sitting quietly. A single high or low reading on a stressful afternoon doesn’t tell you much. A pattern over days or weeks tells you a lot.
How to Check Your Pulse
Sit down and rest quietly for a few minutes before you start. You can check your pulse in two places: your wrist or your neck.
For your wrist, turn one hand palm-up. Place the tips of your index and middle fingers from the other hand on the thumb side of your wrist, in the groove between the bone and the tendon. Press lightly until you feel each beat. Count the beats for 60 seconds using a watch or timer. If you’re in a hurry, count for 15 seconds and multiply by four, though the full 60-second count is more accurate.
For your neck, place two fingertips in the groove beside your windpipe on one side. Never press on both sides of the neck at the same time, as this can cause dizziness or fainting. Press gently and count the same way. In both cases, a light touch works best. Pressing too hard can actually compress the artery and block the pulse you’re trying to feel.
Heart Rate During Exercise
Your heart rate during a workout is a useful gauge of how hard you’re pushing. The simplest way to estimate your maximum heart rate is to subtract your age from 220. A 40-year-old, for example, has an estimated max of about 180 bpm.
From there, exercise intensity breaks into two zones. Moderate-intensity exercise, the kind where you can talk but not sing, puts you at 50% to 70% of your maximum. For that 40-year-old, that’s roughly 90 to 126 bpm. Vigorous exercise, where holding a conversation gets difficult, corresponds to 70% to 85% of your maximum, or about 126 to 153 bpm for the same person.
These zones are estimates, not hard boundaries. The 220-minus-age formula has a margin of error of about 10 to 12 beats in either direction. If a pace feels moderate but your heart rate number says vigorous, your body’s signals are generally more trustworthy than the math.