How to find the number of possible enantiomer for a given molecule?

The number of possible enantiomer is dependent on the chiral centers (asymmetric carbons). If there are n number of chiral centers, then 2ⁿ chiral isomers are possible. 

So, one chiral center would give 2¹=2 chiral isomers

2 chiral center will give 2²=4 chiral isomers  and

3 chiral centers will give 2³=8 chiral isomers