A normal resting heart rate for most adults falls between 60 and 100 beats per minute (bpm). You can find yours right now by placing two fingers on your wrist or neck, counting the beats for 60 seconds, and that number is your heart rate. What that number means depends on your age, fitness level, and what you were doing before you checked.
How to Check Your Heart Rate
You have two easy spots to feel your pulse: your wrist and your neck. For either method, sit down and rest quietly for a few minutes first so you get an accurate resting number.
For your wrist, turn one hand palm-up. Find the spot between the wrist bone and the tendon on the thumb side. Place the tips of your index and middle fingers from your other hand there and press lightly until you feel a rhythmic beat. For your neck, place those same two fingertips in the groove next to your windpipe on one side. Don’t press both sides of your neck at the same time, as this can make you dizzy or even faint.
Once you feel the pulse, watch a clock and count beats for a full 60 seconds. If you’re in a hurry, count for 15 seconds and multiply by four. The 60-second count is more accurate, especially if your rhythm feels uneven. Press gently. Pushing too hard can actually block blood flow and make the pulse harder to detect.
What’s Normal by Age
Heart rate ranges shift dramatically from birth through adulthood. A newborn’s heart beats 100 to 205 times per minute, which would be alarming in an adult but is completely normal for an infant-sized heart pumping blood through a small body. Here’s how the ranges break down:
- Newborn (up to 4 weeks): 100 to 205 bpm
- Infant (4 weeks to 1 year): 100 to 180 bpm
- Toddler (1 to 3 years): 98 to 140 bpm
- Preschool (3 to 5 years): 80 to 120 bpm
- School age (5 to 12 years): 75 to 118 bpm
- Adolescent (13 to 17 years): 60 to 100 bpm
- Adult (18+): 60 to 100 bpm
These numbers apply when you’re awake and sitting still. Your heart rate drops during sleep and rises during any kind of physical activity.
Why Some People Run Lower
If you’re very physically fit, a resting heart rate in the 40s or 50s is typical and healthy. Athletes and people who do regular cardio exercise develop stronger heart muscles that pump more blood per beat, so the heart doesn’t need to beat as often to move the same volume. A resting rate as low as 40 bpm in a fit person is not a concern.
For someone who isn’t particularly active, though, a heart rate consistently below 60 bpm is classified as bradycardia. That doesn’t automatically mean something is wrong. Some people naturally run on the lower end. It becomes a problem when it’s paired with symptoms like dizziness, fatigue, or feeling faint. On the other end, a resting heart rate above 100 bpm is called tachycardia, and it can signal anything from too much caffeine to an underlying heart rhythm issue.
What Raises or Lowers Your Heart Rate
Your heart rate at any given moment reflects dozens of inputs your body is processing. Stress and anxiety activate your fight-or-flight system and push the number up. Dehydration forces your heart to beat faster because there’s less blood volume to circulate. Hot weather does the same thing. Even standing up from a seated position temporarily raises your rate.
Caffeine deserves a specific mention. Drinking more than about 400 mg per day (roughly four cups of coffee) on a regular basis has been shown to raise both heart rate and blood pressure in a way that persists even after rest. People consuming over 600 mg daily showed significantly elevated heart rates that didn’t fully come down after exercise and a five-minute recovery period. Occasional caffeine has a milder, temporary effect, but chronic heavy intake shifts your baseline.
Certain medications also change the picture. Some blood pressure and heart medications are specifically designed to slow your heart rate, so if you’re taking one of those, a reading in the 50s might be expected rather than surprising.
Your Heart Rate During Exercise
During a workout, your heart rate tells you how hard your cardiovascular system is working. To gauge this, you first need a rough estimate of your maximum heart rate. The simplest formula is 220 minus your age. A more refined version, based on a large meta-analysis, uses 208 minus 0.7 times your age, which tends to be more accurate for older adults.
For a 40-year-old, the simple formula gives a max of 180 bpm, while the refined formula gives 180 as well (they converge around that age). For a 60-year-old, the simple formula gives 160, while the refined one gives 166. The difference matters more as you get older.
Once you have your estimated max, the American Heart Association recommends these targets:
- Moderate intensity: 50% to 70% of your maximum heart rate
- Vigorous intensity: 70% to 85% of your maximum heart rate
So a 40-year-old aiming for moderate exercise would target roughly 90 to 126 bpm, and vigorous exercise would mean 126 to 153 bpm. These zones help you get cardiovascular benefit without overworking your system.
How Accurate Are Smartwatches?
Most smartwatches and fitness trackers use optical sensors that shine light into your skin and detect blood flow changes. For basic heart rate tracking during daily life, they’re reasonably reliable. Where they get particularly interesting is in detecting irregular rhythms like atrial fibrillation.
Smartphone apps that use your phone’s camera to read your pulse have detected atrial fibrillation with about 94% sensitivity and 96% specificity in research studies, meaning they catch most cases and rarely flag a false alarm. Smartwatches with built-in sensors perform similarly. The Samsung Galaxy Watch Active 2, for example, detected atrial fibrillation with about 88% sensitivity using its optical sensor alone, and that jumped to 97% when users also took an on-demand ECG reading through the watch.
These tools aren’t replacements for medical-grade equipment, but they’re good enough to flag something worth investigating. If your wearable alerts you to an irregular rhythm, that’s useful information to bring to a doctor.
Heart Rate Variability: A Deeper Metric
If your smartwatch or fitness tracker reports heart rate variability (HRV), that’s measuring something different from your heart rate itself. HRV tracks the tiny fluctuations in time between consecutive heartbeats, fractions of a second that vary from beat to beat. A healthy heart doesn’t beat like a metronome. It constantly adjusts based on signals from your nervous system.
Higher HRV generally indicates that your body is adaptable and resilient. Your nervous system is smoothly shifting between “rest and digest” mode and “alert” mode as needed. Lower HRV can be a sign that your body is under stress, whether from poor sleep, illness, overtraining, or chronic health conditions. Many people use HRV trends over weeks and months as a general barometer of recovery and fitness, though a single reading on any given day doesn’t tell you much on its own.