Capacitor Charge Calculator Formula

Understand the math behind the capacitor charge calculator. Each variable explained with a worked example.

Formulas Used

Stored Charge

charge_uc = capacitance_uf * voltage_v

Stored Charge (C)

charge_c = cap_farads * voltage_v

Variables

VariableDescriptionDefault
capacitance_ufCapacitance(µF)100
voltage_vVoltage(V)12
cap_faradsDerived value= capacitance_uf / 1000000calculated

How It Works

Capacitor Charge

Q = C x V

Where Q is charge in coulombs, C is capacitance in farads, and V is voltage. A larger capacitance or higher voltage stores more charge.

Worked Example

100 uF capacitor charged to 12 V.

capacitance_uf = 100voltage_v = 12
  1. 01Q = 100 uF x 12 V = 1200 uC
  2. 02Q = 0.0001 F x 12 V = 0.0012 C

Ready to run the numbers?

Open Capacitor Charge Calculator