Gravitational force is

Gravitational force is the force of attraction between two bodies having some mass. It is given by:
$\mathrm{F}=\frac{\mathrm{GMm}}{{\mathrm{r}}^2}$
Where M and m are the masses of the bodies, r is the distance between them and G is the universal gravitational constant which has a value of  $6.67 X {10}^{-11} N{m}^2/k{g}^2$ .
As we can see the gravitational force is dependent only on the masses of the particles and the distance between them. It does not depend on the charges on the particles. 
The force exerted between the charged particles is known as electrostatic force.