A charged capacitor stores energy in its electric field, and this calculator tells you how much. The energy in joules equals one half times the capacitance times the voltage squared, so doubling the voltage quadruples the stored energy, which is why big capacitors at high voltage can be dangerous. The charge held equals the capacitance times the voltage, measured in coulombs. Enter your capacitance in farads, using convenient units like microfarads, and the voltage across it, and the tool returns the stored energy and charge together. This is useful for designing flash circuits, power supply hold up capacitors, energy recovery, and understanding how long a supercapacitor can back up a load. It also helps you gauge the discharge hazard of a large capacitor bank. Enter your values and read the energy and charge instantly. Everything runs locally in your browser, so it is fast and private.
A charged capacitor stores energy in its electric field, and this calculator tells you how much. The energy in joules equals one half times the capacitance times the voltage squared, so doubling the voltage quadruples the stored energy, which is why big capacitors at high voltage can be dangerous.
Yes. Capacitor Energy and Charge Calculator is completely free, with no sign-up and no usage limits.
Yes. Capacitor Energy and Charge Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Capacitor Energy and Charge Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.