Pulse and heart rate are closely related but not exactly the same thing. Your heart rate is the number of times your heart squeezes per minute, driven by electrical signals. Your pulse is the number of times your arteries expand and contract in response to that squeezing. For most healthy people, the two numbers match perfectly, which is why they’re often used interchangeably. But in certain conditions, they can diverge, and that difference matters.
What Each One Actually Measures
Your heart rate reflects electrical activity. Each heartbeat starts with an electrical impulse that tells the heart muscle to contract, pushing blood out into the arteries. The count of those contractions per minute is your heart rate. Devices that measure heart rate directly, like chest strap monitors or hospital equipment, use electrocardiography (ECG) technology to detect those electrical signals.
Your pulse reflects a physical pressure wave. When the heart contracts, it forces blood into the aorta, stretching the artery wall. That stretch travels outward through every major artery in your body as a wave of expansion and relaxation. By the time you feel it at your wrist, that pressure wave has traveled roughly a meter from your heart. What you’re feeling under your fingertips is the artery wall bulging with each surge of blood, not the heartbeat itself.
When Pulse and Heart Rate Don’t Match
In a healthy heart with a steady rhythm, every electrical signal produces a full contraction, and every contraction sends a strong enough pressure wave to reach your wrist. The numbers line up. But when the heart beats irregularly or too weakly, some beats don’t generate enough force to push blood all the way to your peripheral arteries. You’d count fewer pulses at the wrist than actual heartbeats at the chest.
This gap is called a pulse deficit, and it’s a hallmark of atrial fibrillation, a common irregular heart rhythm. In one study of people with persistent atrial fibrillation, those with a larger pulse deficit had significantly worse exercise tolerance. The average deficit was 17 beats per minute in people who struggled with physical activity, compared to 12 in those who managed exercise adequately. Higher heart rates correlated with larger deficits, meaning the faster the heart fired, the more beats failed to produce a detectable pulse.
Other conditions that can create a pulse deficit include certain types of premature heartbeats and severe heart failure, where the heart contracts but doesn’t eject enough blood to generate a full pressure wave.
What Your Wearable Is Really Measuring
Most fitness trackers and smartwatches don’t measure heart rate directly. They use a technology called photoplethysmography: green LEDs shine light into your skin, and an optical sensor detects changes in blood volume as your arteries expand with each pulse. That means your wrist device is technically reading your pulse, not your heart’s electrical activity.
Chest strap monitors work differently. Two electrodes pressed against your skin pick up the electrical signals from each heartbeat, functioning like a simplified ECG. This gives a more direct measurement of heart rate and tends to be more accurate, especially during intense movement.
For most people, the distinction doesn’t matter in practice. Your watch’s pulse reading and a chest strap’s heart rate reading will show the same number. But optical sensors can be thrown off by motion artifacts, poor skin contact, or low blood flow to the wrist in cold weather. If your wearable gives you readings that seem unusually high or low during exercise, a chest strap will generally be more reliable.
Normal Resting Range
A normal resting heart rate (or pulse) for adults falls between 60 and 100 beats per minute. Well-trained athletes often sit much lower, sometimes around 40 beats per minute, because their hearts pump more blood with each contraction and don’t need to beat as frequently at rest.
Several everyday factors shift your resting number up or down. Body position is one of the most immediate: your heart rate is lowest when you’re lying down, rises slightly when you sit up, and increases further when you stand. This happens because gravity pulls blood toward your legs when you’re upright, and your heart compensates by beating faster. Caffeine triggers a short-term increase in nervous system activity and blood pressure, which is why experts recommend avoiding it for at least two hours before any formal heart rate measurement. Body temperature plays a role too. A drop in core temperature slows the heart, while a fever or exposure to heat speeds it up.
How to Check Your Pulse Manually
The two easiest spots to feel your pulse are the inside of your wrist (the radial artery) and the side of your neck (the carotid artery). At the wrist, place two fingers on the thumb side of your inner forearm, just below the base of your thumb. At the neck, press gently into the soft groove beside your windpipe.
For the most accurate count, time yourself for a full 60 seconds. A common shortcut is counting for 15 seconds and multiplying by four, but this can miss irregularities. If you notice that the beats feel uneven, with pauses or extra thumps mixed in, counting for the full minute gives a better picture and provides useful information to share with a doctor.
What Pulse Strength Can Tell You
Beyond just counting beats, the quality of your pulse carries information. A strong, easily felt pulse suggests good blood flow and healthy arteries. A weak or hard-to-find pulse in a specific location, like the top of the foot or behind the ankle, can signal narrowed or blocked arteries supplying that area. Healthcare providers check pulses at multiple sites for this reason: the wrist, inner elbow, groin, behind the knee, behind the inner ankle bone, and the top of the foot. Each location corresponds to a different artery, and comparing pulse strength across these sites helps map blood flow throughout the body.
If you can easily feel a steady pulse at your wrist and it falls between 60 and 100 beats per minute at rest, your pulse and heart rate are almost certainly the same number, and both are telling you the same reassuring thing.