What is the typical normal tidal volume in milliliters for an average adult?

What is the typical normal tidal volume in milliliters for an average adult?

• A. 200-300 ml
• B. 300-350 ml
• C. 350-450 ml
• D. 400-500 ml

Answer: (D)

Tidal volume is the amount of air moved in or out with a single normal breath during quiet breathing. In an average adult, it’s about 500 milliliters per breath, roughly 6–8 milliliters per kilogram of predicted body weight. That places the typical normal tidal volume in the 400–500 milliliter range, with 500 mL commonly cited as the standard. The other ranges are smaller than the usual resting breath for most adults. In practice, ventilators are often set to about 6–8 mL/kg PBW to stay within a safe, typical range, which supports why around 500 mL is the best answer.

Tidal volume is the amount of air moved in or out with a single normal breath during quiet breathing. In an average adult, it’s about 500 milliliters per breath, roughly 6–8 milliliters per kilogram of predicted body weight. That places the typical normal tidal volume in the 400–500 milliliter range, with 500 mL commonly cited as the standard. The other ranges are smaller than the usual resting breath for most adults. In practice, ventilators are often set to about 6–8 mL/kg PBW to stay within a safe, typical range, which supports why around 500 mL is the best answer.