Capacitor Size Calculator

Your details

Switch between the four common capacitor sizing problems.
Choose which variable to solve for; enter the other two.
Energy stored in the capacitor, in joules.
J
Voltage across the capacitor, in volts.
V
Capacitance, in microfarads. Used when solving for E or V.
μF
Required capacitance
100μF

Capacitance needed for the selected application.

Stored energy0.5J
Stored charge0.01C
Voltage100V

Required capacitance: 100.0000 μF

  • A 100.0000 μF capacitor charged to 100.0 V stores 0.5000 joules.
  • Doubling the voltage quadruples the stored energy; doubling capacitance only doubles it.
  • Always choose a capacitor with a voltage rating at least 20% above the peak working voltage for reliability.

Next stepCheck your chosen capacitor's ESR (equivalent series resistance) for high-current applications such as motor drives or flash photography.

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