2 type of potential energy

The formula for gravitational potential energy $U_g$ is

$$U_g = m g h$$

where $m$ = mass (kg), $g = 9.8$ m/s$^2$ (acceleration due to gravity), $h$ = height (m).
Units: kg $\cdot$ m/s$^2$ $\cdot$ m = joules (J).

The formula for elastic potential energy $U_e$ (e.g., in a spring) is

$$U_e = \frac{1}{2} k x^2$$

where $k$ = spring constant (N/m), $x$ = displacement from equilibrium (m).
Units: (N/m) $\cdot$ m$^2$ = joules (J).

The two types of potential energy are gravitational and elastic.
Gravitational and elastic