Capacitor Charge Time Calculator

Enter the resistance in ohms and capacitance in farads into the calculator to determine the total time to charge a capacitor.

Capacitor Charge Time Formula

The following formula can be used to calculate the charge time of a capacitor.

T = R * C * 5

  • Where T is the time (seconds)
  • R is the resistance (ohms)
  • C is the capacitance (farads)

FAQ

How long does a capacitor take to charge?

A capacitor will reach a 99% charge after 5 time constants and 63.2% after just one time constant. The time constant is calculated using the formula t = R*C. Typically either 4 or 5 time constants a capacitor is considered full charge. (It will never reach 100% charge.

How long does a capacitor take to discharge?

Conversely a capacitor will discharge only 36.8% after one time constant, but also reach near 99% discharge at around 5 time constants.

capacitor charge time calculator

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