Enter Values
Formulas
Energy = 1/2 × C × V²
Charge = C × V
Capacitance must be in farads for energy in joules and charge in coulombs.
Example
A 470 µF capacitor charged to 24 V stores approximately 0.135 J and holds 0.0113 C of charge.
Practical Considerations
Stored energy rises with the square of voltage. Doubling voltage stores four times as much energy at the same capacitance.
Real capacitors have voltage ratings, leakage, equivalent series resistance, temperature limits, and discharge behavior that affect safe use.
Large capacitor banks can retain hazardous energy after power is removed. Use suitable discharge and verification procedures.