Your pulse and your heart rate are essentially the same thing for most people, most of the time. The National Heart, Lung, and Blood Institute defines your pulse as “the rate your heart beats,” and in a healthy person at rest, the number you count at your wrist will match the number of times your heart contracts each minute. But “essentially the same” isn’t “always identical,” and understanding the small but important distinction can help you get more from the numbers you’re tracking.
The Biological Connection
Every time your heart’s left ventricle contracts, it pushes a surge of blood into your aorta. That surge creates a pressure wave that travels outward through your arterial system, all the way to your fingertips and toes. When you press two fingers against the inside of your wrist and feel that rhythmic tapping, you’re feeling that pressure wave arrive. Each tap represents one heartbeat, which is why counting those taps for 60 seconds gives you your heart rate in beats per minute (bpm).
So your heart rate is the number of contractions your heart makes. Your pulse is the downstream evidence of those contractions, detected at an artery close to the skin’s surface. In normal circumstances, there’s a one-to-one match: one heartbeat produces one pulse beat.
When Pulse and Heart Rate Don’t Match
In certain conditions, not every heartbeat produces a pulse beat strong enough to feel at your wrist. The gap between the two numbers is called a pulse deficit. Atrial fibrillation is the most common cause. During an episode, the heart may beat irregularly and sometimes too weakly to push enough blood forward for a detectable pulse. If an electrocardiogram shows 110 beats per minute but you can only count 90 at the wrist, the pulse deficit is 20.
Pulse deficits can also show up with premature heartbeats (where the heart fires before it has filled with enough blood), in people with pacemakers, and during episodes of very low blood pressure or significant blood loss. For anyone with these conditions, a wrist pulse alone may underestimate the true heart rate.
What a Normal Resting Heart Rate Looks Like
For most adults, a resting heart rate between 60 and 100 bpm is considered normal. Athletes and highly active people can sit comfortably at 40 to 60 bpm because their hearts pump more blood per beat, so fewer beats are needed. A resting rate consistently above 100 is called tachycardia, while one below 60 in a non-athlete is called bradycardia. Neither is automatically dangerous, but both are worth paying attention to if they come with symptoms like dizziness, fatigue, or shortness of breath.
Your resting rate isn’t fixed. It shifts throughout the day based on caffeine intake, stress, temperature, and hydration. When you’re dehydrated, for example, the volume of blood circulating drops, and your heart compensates by beating faster. That’s one reason a surprisingly high pulse reading on a hot afternoon may simply mean you need water, not medical attention.
Where to Check Your Pulse
The two most reliable spots are your wrist and your neck. At the wrist (the radial artery), place your index and middle fingers just below the base of your thumb on the inner side of either arm. At the neck (the carotid artery), press lightly beside your windpipe on one side. Never press both sides of your neck at once, as this can make you dizzy or cause you to faint. If you’ve been told you have plaque buildup in your neck arteries, stick with the wrist.
To get your beats per minute, count the pulses you feel over 30 seconds and multiply by two. For the most accurate resting rate, check first thing in the morning before getting out of bed, or after sitting quietly for at least five minutes.
How Accurate Are Wearable Monitors
Most smartwatches and fitness trackers measure your pulse using small LED lights that detect blood flow changes under your skin. A study of 50 athletic adults compared several popular wrist-worn devices against a medical-grade electrocardiogram (ECG), which is the gold standard for measuring heart rate.
At rest, every device tested performed well, with agreement scores of 85% or higher compared to the ECG. The Apple Watch and Fitbit showed no statistically significant difference from the ECG reading even after adjusting for other variables. The Garmin Vivosmart HR underestimated by about 2 bpm on average, while the TomTom Spark 3 overestimated by about 6 bpm. Chest strap monitors outperformed all wrist devices, hitting 98% agreement with the ECG.
The catch is movement. As treadmill speed increased, wrist-worn accuracy dropped noticeably. At 8 to 9 mph, none of the wrist devices maintained strong agreement with the ECG. So if you’re checking your heart rate during a hard run, a chest strap will give you a more reliable number than your watch. For daily resting checks and light to moderate exercise, most modern wrist devices are accurate enough to be useful.
What Your Pulse Can Tell You Beyond Rate
When a doctor checks your pulse, they’re not just counting beats. They also assess the rhythm (regular or irregular) and the strength. A strong, bounding pulse can reflect high blood pressure, fluid overload, or simply the aftereffects of intense exercise. A weak, thready pulse can signal low blood volume, heart failure, or heat exhaustion. You won’t assign clinical scores to your own pulse, but you can notice obvious changes. If your pulse suddenly feels much weaker than usual or noticeably irregular when it’s normally steady, that’s meaningful information worth sharing with a healthcare provider.
Tracking your resting pulse over weeks and months also reveals trends. A gradually declining resting rate often reflects improving cardiovascular fitness. A resting rate that creeps up without explanation could indicate chronic stress, poor sleep, overtraining, or an underlying health change. The number itself matters less than the pattern.