Exhaled air and lung capacity
There is. 

At a first approximation the total lung capacity is the anatomical dead space(the volume of your trachea, more or less) + the tidal volume(the volume of each breath). It's slightly more complicated than that based on the differences in how deep you breathe and how often you can breathe, but at a first approximation exhaled air + half a liter(plusminus) = lung capacity.