A normal resting heart rate for adults falls between 60 and 100 beats per minute (bpm). That range applies whether you’re 18 or 80, though your actual number on any given day depends on your fitness level, what you’ve eaten or drunk, how warm it is, and whether you’re stressed, pregnant, or on certain medications. Children and infants have faster resting rates, and well-trained athletes can sit comfortably well below 60 bpm.
Normal Resting Heart Rate by Age
Hearts beat faster in the early years of life and gradually slow as the body grows. Here are the typical resting ranges:
- Newborn (birth 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 and older): 60 to 100 bpm
These numbers apply when you’re awake and sitting still. Your heart rate drops during sleep and rises during physical activity, so measuring at rest gives the most consistent baseline.
Why Fitness Lowers Your Resting Rate
Regular 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 active people and endurance athletes can have resting heart rates as low as 40 bpm without any underlying problem. The American Heart Association puts it simply: when it comes to resting heart rate, lower is generally better because it signals a heart that doesn’t have to work as hard to maintain circulation.
If you start a new exercise routine, you may notice your resting rate drop by several bpm over the course of weeks or months. That decline is one of the easiest ways to track improving cardiovascular fitness without any lab work.
When a Heart Rate Is Too Fast or Too Slow
A resting heart rate above 100 bpm in adults is called tachycardia. It can be caused by fever, anxiety, dehydration, caffeine, or an underlying heart rhythm disorder. A temporary spike after coffee or a stressful phone call is normal. A rate that stays above 100 at rest, especially if you feel dizzy, short of breath, or lightheaded, is worth investigating.
A resting rate below 60 bpm is called bradycardia. In fit people this is typically harmless. In someone who isn’t particularly active, a consistently low rate paired with fatigue, fainting, or confusion could signal a problem with the heart’s electrical system.
What Changes Your Heart Rate Day to Day
Caffeine is one of the most common culprits behind a temporarily elevated pulse. It triggers the release of stress hormones that speed the heart and raise blood pressure. Most people tolerate this fine, but if you’re prone to palpitations or irregular rhythms, even a couple of cups of coffee can push your rate noticeably higher.
Heat and dehydration also play a role. When you’re low on fluids or in a hot environment, your blood volume drops slightly and your heart compensates by beating faster. Stress, poor sleep, illness, and some over-the-counter medications (especially decongestants) can do the same. If your resting rate seems high one morning, consider whether any of these factors are at play before worrying.
Heart Rate During Pregnancy
Pregnancy gradually pushes resting heart rate upward because the body is pumping blood for two. The increase typically starts early and peaks in the third trimester. A Harvard-led study tracking women through pregnancy found that the median resting rate rose from about 65 bpm before pregnancy to 77 bpm in the third trimester, an increase of 10 to 20 bpm, or roughly 20% to 25%. Walking heart rate followed a similar pattern, climbing from around 101 bpm to about 110 bpm. This is a normal adaptation, not a sign of a problem.
How to Check Your Pulse at Home
Sit down and rest quietly for a few minutes before measuring. Turn one hand palm-up and find the spot on the thumb side of your wrist, between the wrist bone and the tendon. Place the tips of your index and middle fingers there and press lightly until you feel each beat. Don’t press hard enough to block blood flow.
Count the beats for a full 60 seconds while watching a clock or timer. You can also count for 15 seconds and multiply by four, though the full minute is more accurate, especially if your rhythm feels irregular. Smartwatches and fitness trackers use optical sensors to do this continuously, and they’re reasonably accurate for resting measurements, though they can drift during vigorous movement.
Target Heart Rate During Exercise
Your maximum heart rate is roughly estimated by subtracting your age from 220. A 40-year-old, for instance, would have an estimated max of 180 bpm. A more refined formula, 208 minus 0.7 times your age, tends to be more accurate for older adults. The standard 220-minus-age formula underestimates max heart rate as people age, which can lead to exercise prescriptions that are too easy.
Once you know your estimated max, you can use it to gauge workout intensity:
- Moderate intensity: 50% to 70% of your max. For a 40-year-old, that’s roughly 90 to 126 bpm. This is the zone for brisk walking, easy cycling, or a casual swim.
- Vigorous intensity: 70% to 85% of your max. For the same 40-year-old, about 126 to 153 bpm. Think running, fast cycling, or competitive sports.
You don’t need to stay in one zone the entire workout. Moving between moderate and vigorous effort is a natural part of most activities and provides cardiovascular benefits at both levels.
Heart Rate Variability
Heart rate variability, or HRV, measures the tiny fluctuations in time between consecutive heartbeats. These differences are fractions of a second, too small to feel, but they reveal how well your nervous system adapts to changing demands. A higher HRV generally signals that your body handles stress well, while a consistently low HRV is associated with poorer health outcomes over time. Many wearable devices now report HRV alongside resting heart rate, and tracking it over weeks can give you a rough picture of recovery and overall resilience. Unlike resting heart rate, HRV doesn’t have a single “normal” number. It varies widely between individuals, so your own trend over time matters more than any single reading.