A normal resting heart rate for adults falls between 60 and 100 beats per minute (bpm). That’s your heart rate when you’re awake, calm, and sitting still. Most healthy adults land somewhere between 55 and 85 bpm, and well-trained athletes can sit comfortably in the 40s.
Normal Heart Rate by Age
Children’s hearts beat significantly faster than adults’, and the range narrows as they grow. Here’s what to expect at each stage:
- Infants (4 weeks to 1 year): 100 to 180 bpm
- Toddlers (1 to 3 years): 98 to 140 bpm
- School-age children (5 to 12 years): 75 to 118 bpm
- Adolescents (13 to 17 years): 60 to 100 bpm
- Adults (18+): 60 to 100 bpm
By the teenage years, heart rate settles into the same range it will occupy for the rest of adulthood. These numbers apply when you’re awake and at rest. Sleep and physical activity will push them in either direction.
What Your Heart Rate Looks Like During Sleep
Your sleeping heart rate typically runs 20% to 30% lower than your daytime resting rate. For most healthy adults, that means somewhere between 50 and 75 bpm while you’re asleep. A sleeping heart rate below 40 or above 100 generally falls outside the normal range and is worth mentioning to a doctor, even if you feel fine. Rates consistently above 100 during sleep could point to something like a sleep disorder, while readings in the 20s may need verification to make sure your tracking device is accurate.
Why Athletes Have Lower Heart Rates
Regular vigorous exercise makes the heart muscle stronger and more efficient. A stronger heart pumps more blood with each beat, so it doesn’t need to beat as often to deliver the same amount of oxygen. That’s why endurance athletes often have resting heart rates in the 40s or low 50s. This isn’t a sign of a problem. It’s a sign of cardiovascular fitness. Vigorous exercise is also the single most effective way to lower a resting heart rate over time.
When a Heart Rate Is Too High or Too Low
A resting heart rate consistently above 100 bpm is called tachycardia. A rate below 60 bpm is called bradycardia. Neither label automatically means something is wrong. A fit person with a heart rate of 52 is perfectly healthy. A nervous person sitting in a doctor’s office might temporarily hit 105.
What matters more is context. A heart rate that’s persistently elevated at rest, especially if paired with dizziness, shortness of breath, chest discomfort, or fainting, is a different situation than one that spikes briefly because you just climbed the stairs. The same applies to unusually low rates: if you feel lightheaded, weak, or faint alongside a slow pulse, that combination deserves attention.
What Affects Your Resting Heart Rate
Your resting heart rate isn’t a fixed number. It shifts throughout the day and from one day to the next based on several factors. Caffeine and nicotine are both stimulants that can drive your heart rate up. Even mild dehydration raises it, because your blood thickens slightly when you’re low on fluids, forcing your heart to work harder to push it through your body.
Stress, anxiety, and poor sleep all tend to elevate resting heart rate as well. When your body’s fight-or-flight system is activated, your brain sends direct signals to your heart telling it to speed up. The relaxation side of your nervous system does the opposite, slowing your heart when you’re calm and resting. The balance between these two systems plays a large role in where your heart rate sits at any given moment. Medications, illness, and fever can also shift your baseline temporarily.
How to Measure Your Resting Heart Rate
To get an accurate reading, sit down and rest quietly for a few minutes first. Place two fingers (your index and middle finger) on the inside of your wrist, just below the base of your thumb, or on the side of your neck just below your jawline. Count the beats for a full 60 seconds. Some people count for 15 seconds and multiply by four, but a full minute gives you a more reliable number, especially if your heart rhythm is slightly irregular.
The best time to check is first thing in the morning, before you’ve had coffee or gotten out of bed. That gives you the closest thing to a true baseline. If you’re tracking your heart rate over time, try to measure it under the same conditions each day so your numbers are comparable.
Heart Rate Variability: A Different Metric
If you use a fitness tracker, you may also see a number called heart rate variability, or HRV. This isn’t the same as your heart rate. HRV measures the tiny fluctuations in timing between individual heartbeats, fractions of a second that you’d never notice. A healthy heart doesn’t beat like a metronome. It constantly makes micro-adjustments based on signals from your brain.
Higher HRV generally reflects a nervous system that’s flexible and responsive, able to ramp up when you need it and settle down when you don’t. Lower HRV can show up during periods of stress, poor sleep, or illness, and has been linked to heart conditions as well as anxiety and depression. It’s a useful long-term trend to watch, but day-to-day fluctuations are normal and don’t mean much on their own.
Estimating Your Maximum Heart Rate
Your maximum heart rate is the fastest your heart can beat during intense physical activity. The most common estimate is 220 minus your age, so a 40-year-old would have an estimated max of 180 bpm. A slightly updated version uses the formula 208 minus 0.7 times your age, which produces similar results.
Both formulas are rough guides. Research comparing predicted values to actual maximum heart rates during exercise found that neither formula is a reliable predictor for individuals, particularly younger adults. They tend to overestimate by several beats per minute. They’re useful as ballpark numbers for setting exercise intensity zones, but your true maximum can only be determined through a supervised exercise test. If you’re using heart rate zones to guide workouts, treat the formula as a starting point and adjust based on how you actually feel.