BPM and pulse refer to closely related but technically different things. BPM, or beats per minute, measures how many times your heart contracts. Your pulse measures how many times your arteries expand in response to those contractions. In a healthy person at rest, the two numbers are almost always identical, which is why they’re used interchangeably in everyday life. But there are real situations where they diverge.
What Creates the Difference
Each time your heart squeezes, it pushes blood into the aorta and out through your arterial network. That surge of blood briefly widens each artery it passes through, and that widening is what you feel when you press your fingers to your wrist or neck. So the “beat” you’re feeling isn’t actually your heart. It’s the pressure wave arriving at that artery a fraction of a second after the heart contracts.
This distinction matters because sometimes the heart contracts without enough force to send a detectable pressure wave all the way to your wrist. When that happens, your heart rate (measured in BPM at the chest) is higher than the pulse you’d count at your wrist. The gap between those two numbers is called a pulse deficit.
When BPM and Pulse Don’t Match
For most people, most of the time, heart rate and pulse are the same number. The situations where they split apart tend to involve irregular heart rhythms. Atrial fibrillation is the most common example. During an episode, the heart may fire off rapid, disorganized contractions, but many of those beats are too weak to push enough blood to register as a pulse at the wrist. Someone with atrial fibrillation might have a heart rate of 130 BPM measured by an ECG but a wrist pulse of only 100.
Premature ventricular contractions (extra beats that fire too early) can cause the same mismatch. So can severe low blood pressure and significant dehydration, both of which reduce the volume of blood available per heartbeat. People with pacemakers may also show a difference between chest-measured heart rate and peripheral pulse.
How Each One Is Measured
Heart rate in BPM is most accurately captured by an electrocardiogram, which reads the electrical signals that trigger each contraction. That’s the gold standard in clinical settings because it detects every beat regardless of how strong it is.
Pulse is measured by touch or by optical sensors. The two easiest places to find it manually are the radial artery on the inside of your wrist (just below the thumb) and the carotid artery on the side of your neck. To get an accurate reading, count the beats for a full 60 seconds. The common shortcut of counting for 15 seconds and multiplying by four works reasonably well but can miss irregularities in rhythm.
Smartwatches and fitness trackers use optical sensors that shine light into your skin and detect changes in blood flow. These are measuring your pulse, not your heart’s electrical activity. They’re generally reliable at rest, but accuracy drops during movement. Studies comparing optical wrist sensors to chest-strap monitors have found error rates that range from small (under 2%) during steady conditions to as high as 17% during activity or when the sensor shifts position on your wrist.
What’s a Normal Range
A normal resting heart rate for adults falls between 60 and 100 BPM. Well-trained endurance athletes often sit closer to 40 BPM because their hearts pump more blood per beat and don’t need to contract as frequently. A resting rate consistently above 100 or below 60 (in someone who isn’t particularly fit) is worth paying attention to.
Several everyday factors push your rate around throughout the day. Exercise, stress, caffeine, and heat all raise it. Even mild dehydration speeds up the heart because it compensates for lower blood volume by beating more often. Certain medications and drug interactions can also shift your rate temporarily.
Which One Should You Track
If you’re checking your fitness, monitoring recovery, or just curious about your resting rate, pulse and BPM are functionally the same measurement for you. Counting your wrist pulse or glancing at your smartwatch gives you a reliable enough number to spot trends over time.
The distinction becomes clinically meaningful if you notice your pulse feels irregular, if beats seem to skip or come in uneven clusters, or if your wrist reading consistently looks different from what a chest-strap monitor shows. An irregular pulse doesn’t always mean something serious, but a persistent pattern of skipped or chaotic beats is one of the easiest early signs of atrial fibrillation and other rhythm disorders to catch at home. In those cases, the gap between true heart rate and peripheral pulse is itself a useful piece of diagnostic information.