What is the normal respiratory rate for an adult at rest?

• A. 12-20 breaths per minute
• B. 8-12 breaths per minute
• C. 20-30 breaths per minute
• D. 14-22 breaths per minute

Answer: (A)

Normal resting breathing for an adult is about 12 to 20 breaths per minute. This range fits the body's quiet metabolic needs when a person is calm and not in distress. It’s a standard vital sign you observe by counting breaths for a full minute while the person is at rest and unaware you’re counting, so their breathing isn’t influenced by anxiety or movement.

Knowing this range helps you spot potential issues: rates higher than 20 (tachypnea) can signal fever, pain, anxiety, or respiratory or cardiac problems, while rates lower than 12 (bradypnea) can occur with sleep, certain medications, or metabolic issues. Remember that minor variations can happen with age, fitness, or illness, but 12–20 is the typical benchmark for a healthy adult at rest.