How much air does a person breathe in their lifetime?

Because inhaled air has around 20% oxygen and expelled air contains about 15% oxygen, each breath consumes roughly 5% of the volume of air and converts it to carbon dioxide. As a result, a human requires around 550 liters of pure oxygen (19 cubic feet) every day.

A person will breathe around 75 million gallons (284 million liters) of air over their lifetime. The human body requires 2 gallons (7.5 liters) of air per minute while laying down, 4 gallons (15 liters) while sitting, 6 gallons (23 liters) while walking, and 12 gallons (45 liters) or more while sprinting.