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    Capacitor Energy and Time Constant Calculator

    This calculator computes the energy in a capacitor, given the voltage across it.

    If you specify a load resistor it will also compute the time constant, or the time until the voltage drops to 37%, or charges to 63%.

    Voltage across capacitor
    Capacitance
    Load Resistance (Optional)

    Result

    Energy
    Time Constant

    See our standard resistor calculator for a real world resistor value.

    Equations:

    E= V^2*C/2

    TC= R*C

    1/e = 36.8%

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