Of the five vital signs, respiratory rate is the quiet one — the least glamorous to measure and, not coincidentally, the most often skipped. That's a shame, because it's frequently the first number to move when someone is becoming unwell. A normal adult breathes 12 to 20 times a minute at rest. Children breathe faster, and the younger they are, the faster still. Here's what's normal at each age, how to count it properly, and why this unassuming number deserves more respect than it usually gets.
A healthy adult at rest breathes 12 to 20 times per minute. The best way to count is for a full minute, and, ideally, without the person knowing you're doing it — people unconsciously slow down or speed up the moment they realise their breathing is being watched. A common trick is to keep your fingers on the wrist as though still taking the pulse, and count the rise and fall of the chest.
Breathing rate follows the same pattern as heart rate — fast in the newborn, slowing steadily into the adult range through childhood.
| Age | Normal respiratory rate (breaths per minute) |
|---|---|
| Newborn (0–1 mo) | 30–60 |
| Infant (1–12 mo) | 30–50 |
| Toddler (1–3 yr) | 24–40 |
| Preschool (3–5 yr) | 22–34 |
| School-age (6–12 yr) | 18–28 |
| Adolescent (13–18 yr) | 12–20 |
| Adult | 12–20 |
These are PALS-based resting ranges. A sleeping baby breathes slower and may even pause for a few seconds at a time, which can be normal; a crying or feverish one breathes faster.
Breathing faster than the normal range is called tachypnea; slower is bradypnea. In an adult, a resting rate above 20 is worth noting and above 24 to 25 is a firmer warning — particularly if it's rising each time you check, or arrives with breathlessness, a dropping oxygen level, or the person recruiting the muscles of the neck and shoulders to breathe.
Fast breathing has a long list of possible drivers: fever, pain, anxiety, exertion, a chest infection, asthma, or the body trying to blow off acid in conditions like diabetic ketoacidosis. Slow breathing is less common and can point to the opposite — over-sedation, opioids, or exhaustion in someone who has been working hard to breathe and is beginning to tire. That last one is the dangerous kind: a suddenly falling rate in a struggling patient is a red flag, not a reassurance.
Respiratory rate has a reputation among experienced clinicians as the best early-warning sign there is. It tends to climb well before the heart rate rises or the blood pressure falls, which means an accurate breathing count can flag a developing problem hours ahead of the other vitals. It's a cornerstone of every early-warning scoring system for exactly that reason. The catch is that it only works if it's actually counted — an estimated "16, looks fine" written without watching is worse than useless, because it hides the very change it's meant to catch.
12 to 20 breaths per minute at rest. Count for a full minute where possible, and ideally without the person realising, since people change their breathing when they know it's being watched.
Children breathe faster, and the younger they are the faster it is: newborns about 30–60 a minute, infants 30–50, toddlers 24–40, preschoolers 22–34, school-age children 18–28, and adolescents settle into the adult 12–20.
In an adult, above 20 is tachypnea and above 24–25 is a stronger warning — especially if it's climbing over successive checks or comes with breathlessness, a low oxygen level, or extra effort to breathe. Fast breathing is often the earliest clue someone is becoming unwell.
It's one of the earliest vital signs to change when a person deteriorates — often rising before the heart rate or blood pressure move. An accurate count can flag a developing problem hours ahead of other signs, which is why it shouldn't be skipped or estimated.