Yeah google will do math and conversion right on the search bar. 'in' is the operator that tells google you want an answer in a different unit, which you specifiy, like in liters.
You could use this to figure out tank sizes easy, like
48 * 13 * 20 cubic inches in gallons = 54g (for a 55g tank)
You can abbreviat some things to like
48 * 13 * 20 cu in in gal but I right it out when I give examples as to not confuse.
You can say liters instead, or imperial gallons, or cc instead of cu in, etc etc.