In this work, a correspondence between black-hole solutions of conformal and massive
theories of gravity is found. It is seen that this correspondence imposes some constraints
on parameters of these theories. What is more, a relation between the mass of black holes and
the parameters of massive gravity is found. Indeed, the acceptable ranges of massive gravity parameters
(c1 and c2) are found. It is shown that by considering the positive mass of black holes,
some ranges of c1 and c2 are acceptable.
