About the Capacitor Calculator
Capacitor charge and energy stored from capacitance and voltage, in several unit scales.
Also known as: capacitance calculator, capacitor energy, farad calculator, charge stored.
How to use this calculator
- Enter capacitance, voltage.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Q = C × V · E = ½CV²
Worked example
Using the values pre-filled in the calculator above:
- Capacitance = 1,000 µF
- Voltage = 12 V
the calculator returns:
- Energy stored: 0.072 J
- Charge: 0.012 C
- Charge (mC): 12
- Capacitance in farads: 0.001