You can measure your heart rate by pressing two fingers against an artery in your wrist or neck and counting the beats you feel. A normal resting heart rate for adults falls between 60 and 100 beats per minute (bpm). Whether you use your fingers, a smartwatch, or a smartphone app, each method has tradeoffs in convenience and accuracy.
Finding Your Pulse by Hand
The two easiest places to feel your pulse are your wrist and your neck. For the wrist (radial pulse), place your index and middle fingers just above the wrist joint near the base of your thumb. Press gently until you feel a rhythmic tapping against the bone underneath. For the neck (carotid pulse), place the same two fingers on either side of your windpipe, roughly at the midpoint between your earlobe and chin.
Use your index and middle fingers only. Your thumb has its own pulse, which can mix you up and give you a false count.
Counting the Beats
The gold standard is counting beats for a full 60 seconds while watching a clock. This gives you the most accurate reading. If you’re in a hurry, count for 30 seconds and multiply by 2, or count for 15 seconds and multiply by 4. Shorter counting windows introduce more error because even being off by one beat gets multiplied. A single missed beat in a 15-second count becomes a 4-bpm error, while the same miss over 60 seconds is just 1 bpm off.
Some guides suggest a 10-second count multiplied by 6, but this amplifies any miscounting even further. Stick with 30 or 60 seconds when accuracy matters.
Getting an Accurate Resting Reading
Your resting heart rate is the number that matters most for tracking your baseline health. To get a reliable measurement, you need to actually be at rest. Harvard Health Publishing recommends avoiding measurement within one to two hours after exercise or a stressful event, and waiting at least an hour after drinking caffeine. Don’t take a reading after sitting or standing in one position for a long time either, since both can skew results. The ideal moment is first thing in the morning before you get out of bed, or after sitting quietly for five to ten minutes.
How Smartwatches and Fitness Trackers Work
Wearable devices use small LED lights pressed against your skin. These lights shine into your wrist, and a sensor on the same side of the device picks up the light that bounces back. The key is hemoglobin, the protein in red blood cells that carries oxygen. Hemoglobin absorbs light differently depending on how much blood is flowing through your vessels at any given moment. With each heartbeat, a small pulse of blood surges through your wrist, changing how much light gets absorbed versus reflected. The sensor detects these tiny fluctuations and translates them into a heart rate number.
This technology works well in many situations, but it has limits. Research comparing wrist-worn monitors to validated chest straps found that wrist devices can significantly underestimate heart rate during certain activities, particularly cycling on a stationary bike. During that exercise, wrist monitors read around 105 to 106 bpm while chest straps measured 127 bpm. For walking, jogging, and arm exercises, the two methods showed no significant difference. The takeaway: wrist sensors are generally reliable at rest and during steady movement, but accuracy can drop during activities involving grip changes, vibration, or heavy wrist motion.
Chest Strap Monitors
Chest straps work differently. They detect the electrical signals your heart produces with each beat, similar to a hospital ECG. Because they read electrical activity directly rather than interpreting light reflections, chest straps are considered the most accurate consumer device and are often used as the reference standard in research studies. They’re popular with runners, cyclists, and other athletes who need precise data during high-intensity training. The tradeoff is comfort: wearing a strap around your ribcage isn’t as effortless as glancing at your wrist.
Smartphone Camera Apps
Many apps let you place your fingertip over your phone’s camera and flash to get a heart rate reading. The camera detects color changes in your fingertip as blood pulses through with each beat, using the same basic principle as a smartwatch sensor. A large validation study published in Europace found that these readings achieved over 96% signal quality with repeated measurements and were highly accurate at detecting irregular heart rhythms. However, the technology tended to underestimate heart rate by about 7 bpm on average, with larger errors at higher heart rates. For a quick spot check, these apps are useful. For precise tracking, a dedicated device is better.
What Your Number Means
For adults, a resting heart rate between 60 and 100 bpm is considered normal. Well-trained athletes often have resting rates in the 40s or 50s because their hearts pump more blood per beat and don’t need to beat as frequently. Children’s hearts beat faster: newborns range from 100 to 205 bpm, toddlers from 98 to 140, and school-age children from 75 to 118. By adolescence, the range settles to the adult standard of 60 to 100.
A resting heart rate below 60 bpm is technically called bradycardia, but it’s not automatically a problem. If your rate sits between 40 and 60 and you feel fine, it typically just means your heart is efficient. A rate that drops below 40, especially if it’s unusual for you, is worth urgent medical attention. On the high end, a resting rate consistently above 100 bpm at rest (tachycardia) can signal dehydration, stress, anemia, thyroid issues, or other conditions worth investigating.
Estimating Your Maximum Heart Rate
If you’re using heart rate to guide exercise intensity, you’ll need a rough estimate of your maximum heart rate. The classic formula is 220 minus your age, developed by researchers Fox and Haskell. So a 40-year-old would estimate a max of 180 bpm. This formula is simple but tends to overestimate max heart rate in younger people and underestimate it in older adults.
A more refined formula from researchers Tanaka, Monahan, and Seals calculates it as 208 minus 0.7 times your age. For that same 40-year-old, this gives 180 bpm (coincidentally the same), but the two formulas diverge more at younger and older ages. A 25-year-old gets 195 from the classic formula but 190.5 from the updated one. A 65-year-old gets 155 versus 162.5. Neither formula is perfect for every individual, but they provide a useful starting point for setting training zones.
Tips for Consistent Tracking
If you’re monitoring your heart rate over time, consistency matters more than any single reading. Measure at the same time of day, in the same position, after the same amount of rest. Morning readings before getting out of bed give the most stable baseline. Track trends over weeks rather than reacting to daily fluctuations, since your heart rate naturally varies with sleep quality, hydration, stress, illness, and dozens of other factors. A gradual downward trend in resting heart rate over months generally reflects improving cardiovascular fitness, while a sustained unexplained increase can be an early signal that something is off.