How do I find out what my vocal range is?

Well that is technically called vocal classification. Your going to have to find someone (vocal coach) who specializes with that to get your exact range this is the best way. But if you have a mic you could record your highest note and lowest note(without strain of course" and give it to people on youtube who specialize in that example: Thats mariah carey's vocal range......people always thought she was a soprano but she is an alto with coloratura abilites (soprano's cant' go that low also there is more than just soprano and alto like lyric,mezzo,contralto ect) They can tell you what your range is but your going to have to have a couple of songs on youtube to tell you what your voice type is like.