Vital signs are four core measurements that reveal how well your body’s most basic functions are working: heart rate, blood pressure, body temperature, and breathing rate. A fifth measurement, blood oxygen level, is now commonly tracked alongside them. Each has a specific normal range, and knowing where your numbers fall tells you whether something needs attention. Here’s how to measure each one correctly and what the numbers actually mean.
Heart Rate: 60 to 100 Beats Per Minute
A normal resting heart rate for adults falls between 60 and 100 beats per minute. Rates above 100 are considered fast (tachycardia), and rates below 60 are considered slow (bradycardia). That said, well-trained athletes often have resting heart rates in the 40s or 50s, which is perfectly healthy for them.
To check your pulse manually, turn one hand palm-up and place the tips of your index and middle fingers on the inside of the opposite wrist, between the wrist bone and the tendon on the thumb side. Press gently until you feel a beat. Don’t use your thumb, which has its own pulse and can throw off the count. Once you find the rhythm, count the beats for 30 seconds and multiply by two. If the rhythm feels irregular, count for a full 60 seconds instead to get a more accurate number.
You can also find your pulse on the side of your neck, in the groove alongside your windpipe. This carotid pulse is stronger and easier to locate, which makes it useful during exercise or in an emergency. Use light pressure here. Pressing too hard can slow the heart reflexively.
Pay attention not just to the rate but to the rhythm. A steady, even beat is normal. Occasional skipped beats are common and usually harmless. Frequently irregular rhythms, especially paired with lightheadedness or shortness of breath, are worth reporting to a doctor.
Blood Pressure: What the Two Numbers Mean
Blood pressure is written as two numbers, like 118/76. The top number (systolic) measures the pressure in your arteries when your heart contracts. The bottom number (diastolic) measures the pressure between beats, when your heart is resting. Both numbers matter.
The 2025 guidelines from the American Heart Association and American College of Cardiology classify blood pressure into four categories:
- Normal: below 120 systolic and below 80 diastolic
- Elevated: 120 to 129 systolic with diastolic still below 80
- Stage 1 hypertension: 130 to 139 systolic or 80 to 89 diastolic
- Stage 2 hypertension: 140 or higher systolic or 90 or higher diastolic
Notice that elevated blood pressure can be diagnosed even when the bottom number looks fine. A systolic reading of 125/74 is no longer considered normal.
Getting an accurate reading requires more setup than most people realize. Sit with your back supported and feet flat on the floor for at least five minutes before measuring. Rest your arm on a flat surface at heart level. Don’t talk during the reading. Body position makes a real difference: blood pressure and heart rate tend to read higher when you’re sitting compared to lying down, so consistency matters. Always measure in the same position, at roughly the same time of day, to get comparable results. A single high reading isn’t a diagnosis. Patterns across multiple readings are what count.
Body Temperature: More Variable Than You Think
The classic “normal” of 98.6°F (37.0°C) is an average, not a fixed target. Healthy body temperature typically ranges from 97.7°F to 99.5°F (36.5°C to 37.5°C). It fluctuates throughout the day, running lower in the morning and slightly higher in the late afternoon. For most adults, a temperature of 100.4°F (38.0°C) or above is considered a fever.
Where you take the temperature changes what you’ll see on the thermometer. Rectal readings are closest to your true core temperature and serve as the clinical gold standard. Oral (under the tongue) thermometers are widely used and reasonably accurate, though they tend to read slightly lower than rectal. Tympanic (ear) thermometers are the most accurate commercially available option for everyday use, with readings that closely match rectal measurements. One detail worth knowing: there can be a small difference between your left and right ear, so pick one and stick with it for consistency. Armpit (axillary) readings are the least reliable, often running a full degree or more below core temperature.
If you’ve had a hot or cold drink, wait 15 minutes before using an oral thermometer. For ear thermometers, make sure the ear canal is free of wax buildup, which can insulate the sensor and skew results.
Breathing Rate: 12 to 20 Breaths Per Minute
A normal respiratory rate for adults is 12 to 20 breaths per minute. One breath equals a full cycle of inhaling and exhaling. Rates above 20 at rest can signal pain, anxiety, infection, or a heart or lung problem. Rates below 12 can indicate central nervous system depression from medications, head injury, or other causes.
Counting someone else’s breathing rate is more accurate than counting your own, because the moment you focus on your breathing, you unconsciously change it. The standard clinical approach is to count breaths while pretending to take a pulse, so the person doesn’t realize you’re watching their chest or abdomen rise and fall. Count for a full 60 seconds. Shorter counts of 30 seconds are common in practice, but they tend to produce less precise numbers, especially if the rhythm varies slightly.
Beyond the rate, notice the pattern. Breathing should be relatively even in depth and rhythm. Labored breathing, long pauses between breaths, or the use of neck and shoulder muscles to inhale are all signs of respiratory distress, regardless of what the count shows.
Blood Oxygen Level: 95% and Above
A pulse oximeter clips onto your fingertip and shines light through your skin to estimate how much oxygen your red blood cells are carrying. For most people, a normal reading is between 95% and 100%. A reading of 92% or lower warrants a call to your healthcare provider. At 88% or below, seek emergency care.
Oximeters can give false readings if your hands are cold, if you’re wearing nail polish or artificial nails, or if you’re moving your hand during the reading. Dark skin pigmentation can also cause some devices to overestimate oxygen levels by a few percentage points. If you get a reading that seems off, warm your hands, remove nail polish, and try again. Pay attention to trends rather than fixating on a single number.
How Vital Signs Differ in Children
Children are not small adults when it comes to vital signs. Their hearts beat faster and they breathe more rapidly, and what looks alarming by adult standards is perfectly normal for a toddler. Here are the ranges by age:
- Newborn to 3 months: heart rate 110 to 160, respiratory rate 30 to 60
- 3 to 6 months: heart rate 100 to 150, respiratory rate 30 to 45
- 6 to 12 months: heart rate 90 to 130, respiratory rate 25 to 40
- 1 to 3 years: heart rate 80 to 125, respiratory rate 20 to 30
- 3 to 6 years: heart rate 70 to 115, respiratory rate 20 to 25
- 6 to 12 years: heart rate 60 to 100, respiratory rate 14 to 22
By around age 12, children’s vital signs approach adult ranges. For younger children, always compare readings to the age-appropriate range rather than adult norms.
How Aging Changes Your Baseline
After age 65, several shifts in vital signs are common. The risk of high blood pressure increases, and many older adults experience orthostatic hypotension, a sudden drop in blood pressure when standing that causes dizziness. This is especially common in people taking blood pressure medications.
Resting heart rate doesn’t change much with age, but the heart responds differently to exercise. It takes longer for pulse to rise during activity and longer to recover afterward. Maximum heart rate during exertion is lower than it was in younger years.
Temperature regulation becomes less reliable. Older adults produce less sweat, making overheating a real risk. They also have less insulating fat beneath the skin, making them more vulnerable to cold. Perhaps most importantly, older adults may not mount a strong fever even during serious infections. A temperature of 99°F in a 75-year-old can carry the same significance as 101°F in a younger person. When illness is suspected, checking all vital signs together gives a much clearer picture than relying on temperature alone.
Getting the Most Accurate Readings
A few simple habits improve the reliability of any vital sign measurement. Take readings at the same time of day when possible, since all vital signs fluctuate throughout the day. Avoid caffeine, exercise, and smoking for at least 30 minutes before checking blood pressure or heart rate. Sit quietly for five minutes before measuring. Record your numbers with the date, time, and any relevant context (just woke up, feeling anxious, after a walk) so you can spot real trends over time.
No single reading tells the full story. What matters is the pattern across days and weeks, and how your numbers compare to your own personal baseline rather than a population average. Someone whose resting heart rate is normally 62 should take note if it suddenly runs at 88 for several days, even though both numbers fall within the “normal” range.