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Online Calculator
Capacitor energy calculator
Enter capacitance and voltage to calculate E = ½CV² and charge Q = CV.
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Frequently asked questions
What is the energy formula of a capacitor?
E = ½CV².
What is the formula for electric charge?
Q = CV.
What units does it use?
Microfarads and volts for input; joules and microcoulombs for output.
Can the voltage be negative?
Yes. Energy depends on V², while the ideal charge keeps the sign of V.