Capacitor Charge and Discharge Calculator

Online Calculator and Formulas to calculate the Capacitor charge and Discharge at a Specified Time

Calculate the discharge voltage


On this page you can calculate the discharge voltage of a capacitor in a RC circuit (low pass) at a specific point in time.

In addition to the values of the resistor and the capacitor, the original input voltage (charging voltage) and the time for the calculation must be specified

The result shows the charging voltage at the specified time and the time constant τ (tau) of the RC circuit. The capacitor is discharged approx. 99.33% after a period of 5 τ. This means that at specified times, well over 5 τ the charging voltage is close to zero.


Calculate discharge voltage

 Input
Capacitor
Resistance
Input voltage U0
Discharge time
  Result
Time constant
Charging voltage
Discharge current
Decimal places

If you move the mouse over the graphic, the charging voltages of different times are displayed.


Formula for calculating the discharge voltage

\(\displaystyle U_C=U_0 · e^{-\frac{t}{τ}}\)

\(\displaystyle τ=R ·C\)

Legend

\(\displaystyle R\)

Resistor (Ω)

\(\displaystyle C\)

Capacitor (F)

\(\displaystyle τ\)

Time constant (sec)

\(\displaystyle U_0\)

Applied voltage (V)

\(\displaystyle U_C\)

Charging voltage at the capacitor (V)

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