12 cc = .4 fl. oz.
Ounces usually express weight while cc's are volume,
so, since there is no mention of density, you probably meant :
How many fluid ounces is 12cc ? In which case
12 cubic centimetres = 0.42234 Imperial fluid ounces
Regards - Ian
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them