The simplest way to know your heart rate is to press two fingers against the inside of your wrist, count the beats you feel, and time yourself. A normal resting heart rate for adults falls between 60 and 100 beats per minute (bpm). You can measure yours manually in under a minute, or use a wearable device or smartphone for continuous tracking.
How to Check Your Pulse Manually
Before you start, sit down and rest quietly for a few minutes. Any recent movement will temporarily raise your rate and give you a less accurate resting number.
Place the tips of your index and middle fingers on the inside of your opposite wrist, just below the base of your thumb. You’re feeling for the radial artery. Press lightly until you detect a steady tapping under your fingertips. Pressing too hard can actually block blood flow and make the pulse harder to find.
If you can’t find it at the wrist, try the side of your neck. Place the same two fingers in the soft groove just beside your windpipe, below the jaw. This is the carotid artery, and the pulse is usually stronger here. Avoid pressing on both sides of the neck at the same time.
Once you feel the beat, look at a clock or start a timer. Count every beat for 30 seconds, then multiply by two. Research on pulse-counting accuracy suggests this 30-second method gives the best balance of speed and precision. Counting for just 15 seconds and multiplying by four works in a pinch, but it becomes less reliable when the heart rate is above 100 bpm because a single missed beat throws the total off by four. If you want the most accurate reading, count for a full 60 seconds.
What a Normal Resting Heart Rate Looks Like
For adults 18 and older, a resting heart rate between 60 and 100 bpm is considered normal. Well-trained athletes often sit in the 40s or 50s because their hearts pump more blood per beat, so fewer beats are needed.
Children run higher. A newborn’s resting rate can be anywhere from 100 to 205 bpm. By school age (5 to 12 years), it settles to roughly 75 to 118 bpm. Adolescents from 13 to 17 reach the adult range of 60 to 100 bpm. These numbers apply when a person is awake and sitting still. Sleep brings them lower, and any physical activity pushes them higher.
A resting rate consistently below 60 bpm is called bradycardia. Above 100 bpm at rest is called tachycardia. Neither label automatically means something is wrong. A low rate in a fit person is a sign of cardiovascular efficiency, and a temporarily elevated rate can reflect caffeine, stress, or a warm room. But if a rate outside the 60 to 100 range comes with dizziness, chest discomfort, or shortness of breath, that combination warrants attention.
How Wearable Devices Measure Heart Rate
Smartwatches and fitness trackers use small green LED lights pressed against your skin. The light shines into your wrist, and a sensor measures how much light bounces back. Because blood absorbs light differently depending on how much is flowing through the vessels at any given moment, the device can detect each pulse wave and calculate your heart rate from the pattern. This technology is called photoplethysmography, but all you need to know is that it reads blood volume changes through your skin.
Chest strap monitors work on a different principle. They detect the tiny electrical signals your heart produces with each beat, similar to what a hospital ECG picks up. In accuracy studies, chest straps like the Polar H7 matched medical-grade ECG readings to within less than 1 bpm under all exercise conditions.
Wrist-worn devices are less precise. A study published in Cardiovascular Diagnosis and Therapy compared several popular watches against ECG in cardiac rehab patients. The Apple Watch came closest among wrist devices, with an average error of less than 1 bpm. But averages can be misleading. When researchers looked at individual readings, more than 5% of measurements from every wrist-worn monitor tested were off by at least 20 bpm. Some readings from the Garmin Forerunner 235 drifted as far as 33 to 40 bpm from the true value. In general, wrist monitors stay within about 10% of your actual heart rate most of the time, which is good enough for exercise tracking but not clinical-grade.
How to Spot an Irregular Rhythm
Checking your rate tells you how fast your heart is beating. Checking your rhythm tells you whether those beats are evenly spaced. Both matter.
A normal rhythm feels like a steady drum beat. Once you tune into it, you can predict when the next beat will land. An irregular rhythm is harder to follow. The gaps between beats vary, some beats feel weaker than others, and you can’t anticipate the timing. Stanford Medicine recommends sitting, leaning slightly forward, and placing your right hand on the left side of your chest to feel the beat directly. Holding your breath for a few seconds can help, since breathing naturally causes small fluctuations in heart rate that can make a normal rhythm seem uneven.
If the pattern genuinely feels chaotic, with beats that seem to skip, cluster, or arrive at random, that can be a sign of atrial fibrillation, the most common type of sustained irregular heart rhythm. Occasional skipped beats on their own are common and usually harmless, but a persistently irregular pattern is worth getting checked with a proper ECG.
Calculating Your Maximum Heart Rate
If you’re tracking heart rate during exercise, knowing your estimated maximum helps you gauge intensity. The classic formula is simple: 220 minus your age. A 40-year-old gets 180 bpm as their predicted max. This formula has been around for decades, but it can be off by 10 to 12 bpm in either direction.
A newer formula attempts to narrow that margin. Multiply your age by 0.7, then subtract the result from 208. For that same 40-year-old: 0.7 × 40 = 28, and 208 − 28 = 180. The two formulas happen to agree at age 40, but they diverge for younger and older adults. The Mayo Clinic references this updated version, using 208 as the starting point.
Neither formula is exact for any individual, but they give you a useful ballpark for setting training zones. Moderate-intensity exercise typically puts you at 50 to 70% of your max, while vigorous exercise pushes you to 70 to 85%.
What Affects Your Heart Rate
Your resting heart rate isn’t a fixed number. It shifts throughout the day and from one day to the next based on several factors. Caffeine and alcohol both raise heart rate through stimulation of the sympathetic nervous system, the “fight or flight” wiring. Even moderate alcohol intake can bump your rate noticeably. Dehydration, heat, anxiety, and poor sleep all push the number up as well.
Certain medications pull it in one direction or another. Beta-blockers, commonly prescribed for high blood pressure, slow the heart rate. Asthma inhalers that contain bronchodilators can speed it up. If you’re tracking your resting heart rate over time and notice a sudden shift, consider whether a new medication, supplement, or change in caffeine habits could explain it.
Fitness level has one of the largest long-term effects. As cardiovascular fitness improves, resting heart rate tends to drop because the heart becomes more efficient at pumping blood. Tracking your resting rate first thing in the morning, before getting out of bed, gives you the most consistent baseline for spotting trends over weeks and months.