I need the formula for finding capacitance

The fundamental formula for capacitance ($C$) is defined as the ratio of the magnitude of the charge ($Q$) stored on either plate to the potential difference ($V$) across the plates:

$$C = \frac{Q}{V}$$

Other common formulas involving capacitance include:

• Energy stored in a capacitor ($E$):

  $$E = \frac{1}{2} C V^2$$ $$E = \frac{1}{2} Q V$$ $$E = \frac{Q^2}{2C}$$

• Capacitance of a parallel-plate capacitor:

  $$C = \frac{\epsilon A}{d}$$

  where $\epsilon$ is the permittivity of the dielectric material between the plates, $A$ is the area of one plate, and $d$ is the distance between the plates.