Capacitor Calculator

Calculate capacitance, charge, energy, and time constants for capacitors

Input Values

Result

What is a Capacitor?

A capacitor is an electronic component that stores electrical energy in an electric field. It consists of two conductive plates separated by a dielectric material. Capacitors are used in various electronic circuits for filtering, timing, and energy storage.

Capacitor Formulas

Capacitance:

C = Q/V

Where C = capacitance (F), Q = charge (C), V = voltage (V)

Charge:

Q = C × V

Where Q = charge (C), C = capacitance (F), V = voltage (V)

Energy:

E = ½ × C × V²

Where E = energy (J), C = capacitance (F), V = voltage (V)

Time Constant:

τ = R × C

Where τ = time constant (s), R = resistance (Ω), C = capacitance (F)

How to Use the Calculator

  1. Choose what you want to calculate (capacitance, charge, energy, or time constant)
  2. Enter the known values in the appropriate fields
  3. Click "Calculate" to get the result
  4. View the step-by-step solution

Example Calculations

Calculate Charge:

Capacitance: 100 μF

Voltage: 12 V

Q = 100 × 10⁻⁶ × 12 = 1.2 mC

Calculate Energy:

Capacitance: 220 μF

Voltage: 5 V

E = ½ × 220 × 10⁻⁶ × 5² = 2.75 mJ