Energy and charge stored in a capacitor
The energy and charge stored in a capacitor can be calculated if the voltage and capacitance are known.
Formulas
The following formulas can be used to calculate the energy and charge in a capacitor. You can also calculate the voltage or capacitance if the other values are known.
Energy
![](/shared/media/generated/9b75b9340fe6.png)
![](/shared/media/generated/2f91ce964723.png)
![](/shared/media/generated/6c847e40c1f9.png)
Charge
![](/shared/media/generated/63e093bd7d5d.png)
![](/shared/media/generated/b6af8214c173.png)
![](/shared/media/generated/757cd36f9a6a.png)
The following formula is needed if you want to calculate the capacitance when only the stored energy and charge are known:
![](/shared/media/generated/1b21bb789d92.png)
E is the symbol for energy and is measured in joule (J).
C is the symbol for capacitance and is measured in farad (F).
V is the symbol for voltage and is measured in volt (V).
Q is the symbol for charge and is measured in coulomb (C).