How do you convert BHP to CC?

Hp is power, c.c. is volume. Depending on how highly tuned an engine is it can make different amounts of hp from the same volume.

30 cc equals 1 ounce An 8 oz. glass would therefore equal 240 cc There are 15 cc in a Tablespoon or 5 cc in a teaspoon and two Tablespoons in an ounce.

The cm3 is a unit of volume and the mg is a unit of mass.

no you can't

50 cc is a capacity, of a very small engine. The actual horsepower depends on how it is engineered, compression ratio, valve timing etc. It is likely to be less than 5 horsepower.