I suggest that you look into peak flow and try your own, if not .... Peak flow is where you breathe into a device specially designed to measure the amount of air your lungs and how much it can obtain as everybody has a different maximum level of air (oxygen) they can get in your lungs.
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Take a deep breath, and blow into a balloon, until you feel that your lungs have totally expelled the air. The balloon size would probably give you an idea of the amount of air lungs can hold
It varies by person. Genetics, age, gender and hereditary genes all play a role in your lung size.