You can track your heart rate manually by feeling your pulse at your wrist or neck, or automatically using a wearable device like a smartwatch or fitness band. A normal resting heart rate for adults falls between 60 and 100 beats per minute, and tracking yours over time can reveal useful patterns about your fitness, stress levels, and overall health.
How to Measure Your Pulse Manually
The simplest way to check your heart rate requires nothing but your fingers and a clock. Two spots on your body give you a reliable pulse: the inside of your wrist (on the thumb side, between the bone and the tendon) and either side of your neck, just beside your windpipe.
To get an accurate reading, sit down and rest quietly for a few minutes before you start. Turn your palm face up and place two fingers gently on the inside of your wrist. Once you feel the rhythmic thumping, count the number of beats for a full 60 seconds. That number is your heart rate in beats per minute. If you’re short on time, you can count for 15 seconds and multiply by four, though the full minute gives you a more precise result.
The best time to check your resting heart rate is right when you wake up in the morning, before you get out of bed, drink coffee, or check your phone. This gives you a true baseline, free from the effects of activity, caffeine, or stress. Tracking that morning number over weeks and months is one of the easiest ways to spot meaningful changes in your cardiovascular fitness.
How Wearable Devices Track Your Heart Rate
Smartwatches and fitness bands use small LED lights on the underside of the device to shine into your skin. A sensor next to the light detects how much light bounces back. With each heartbeat, blood surges through the tiny vessels in your wrist, briefly changing how much light gets absorbed versus reflected. The device picks up these fluctuations and uses the pattern to calculate your beats per minute.
This technology works continuously throughout the day, which is its biggest advantage over manual checks. Instead of a single snapshot, you get a record of how your heart rate responds to exercise, sleep, meals, and stressful moments. Most devices also log your resting heart rate each morning and chart it over time, making trends easy to spot.
Accuracy Limitations of Wrist Sensors
Wrist-based sensors are convenient, but they aren’t perfect. Several factors can throw off a reading. Excessive arm movement during exercise can create signal noise that the sensor struggles to filter out. Sweat building up under the device, a loose band, and changes in blood flow during intense effort all reduce accuracy too.
Skin tone also plays a role. The pigment melanin absorbs green light, which is the wavelength most wrist sensors rely on. Research published in PLOS One found that during high-intensity exercise, readings for people with medium and darker skin tones showed errors averaging around 12 beats per minute compared to a chest strap reference. At lower intensities, the gap was much smaller. If you need precise readings during hard workouts, a chest strap heart rate monitor paired with your watch will give more reliable data regardless of skin tone.
For the most accurate wrist readings, wear the band snug (but not tight) about one finger-width above your wrist bone, keep the sensor clean, and know that resting and light-activity readings will be more trustworthy than those captured mid-sprint.
What Your Resting Heart Rate Tells You
A resting heart rate between 60 and 100 bpm is considered normal for adults. Well-trained athletes often sit below 60 bpm because their hearts pump blood more efficiently with each beat. A resting rate consistently above 100 bpm is called tachycardia, while one below 60 bpm is called bradycardia. Neither is automatically a problem, but either can signal an underlying issue if it’s accompanied by dizziness, fatigue, or shortness of breath.
Children have naturally faster heart rates. Newborns range from 100 to 205 bpm, toddlers from 98 to 140 bpm, and school-age kids from 75 to 118 bpm. By adolescence, the range settles into the adult norm of 60 to 100 bpm.
What matters most isn’t a single reading but the trend. If your resting heart rate gradually drops over several weeks of regular exercise, that’s a sign your cardiovascular system is getting stronger. A sudden spike that lasts several days could reflect illness, poor sleep, dehydration, or elevated stress.
How to Calculate Your Heart Rate Zones
Heart rate zones help you train at the right intensity. They’re based on your estimated maximum heart rate, which you can calculate with a simple formula: subtract your age from 220. A 35-year-old, for example, would have an estimated max of 185 bpm. A slightly more refined formula, developed by researcher Hirofumi Tanaka, uses 208 minus 0.7 times your age, which gives that same 35-year-old a max of roughly 183 bpm. Both are estimates, not exact numbers, but they’re close enough to build useful training ranges.
From there, zones are typically expressed as percentages of your max:
- Zone 1 (50 to 60%): Very light effort, good for warm-ups and recovery walks.
- Zone 2 (60 to 70%): Light aerobic exercise where you can hold a full conversation. This is the zone most associated with building endurance and burning fat.
- Zone 3 (70 to 80%): Moderate effort. Conversation becomes harder. Improves overall cardiovascular fitness.
- Zone 4 (80 to 90%): Hard effort used in interval training. You can only speak in short phrases.
- Zone 5 (90 to 100%): Maximum effort, sustainable for only short bursts.
Most wearable devices calculate these zones automatically once you enter your age, and some adjust them over time as they gather more data about your fitness level.
Heart Rate Variability: A Deeper Metric
Beyond beats per minute, many wearables now track heart rate variability, or HRV. While your heart rate tells you how fast your heart is beating, HRV measures the tiny fluctuations in timing between consecutive beats. Those gaps aren’t perfectly uniform, and the amount of variation reflects how well your nervous system is balancing stress and recovery.
Higher HRV generally signals that your body is resilient and well-recovered. Your nervous system is flexibly toggling between its “active” mode (the fight-or-flight response that speeds your heart up) and its “rest” mode (the relaxation response that slows things down). Lower HRV suggests your body is under strain, whether from overtraining, poor sleep, illness, or chronic stress. People with higher resting heart rates tend to have lower HRV simply because there’s less time between beats for variation to occur.
HRV is highly individual, so comparing your number to someone else’s isn’t useful. What matters is your own baseline and how it shifts. Most devices that track HRV measure it overnight or first thing in the morning and present a readiness or recovery score to simplify interpretation. A consistently declining HRV trend over several days is a practical signal to ease up on training or prioritize sleep.
Building a Tracking Routine
Consistency matters more than precision. Whether you use a wearable or your own two fingers, checking under the same conditions each time gives you the most meaningful data. Measure your resting heart rate in the morning before getting up. If you’re using a wearable, glance at your overnight trends rather than obsessing over any single reading during the day.
Keep a simple log if you’re tracking manually: date, resting heart rate, and a note about how you slept or whether you’re feeling under the weather. After a few weeks, patterns emerge that no single measurement could reveal. You’ll start to notice that your heart rate creeps up when you’re fighting off a cold, drops after a week of consistent running, or spikes on days when stress is high. That ongoing awareness is the real value of tracking, turning a basic number into a window into how your body is actually doing.