basic

Capacitor Energy Calculator

E = ½ · C · V² stored in a capacitor.

Compute the energy stored in a capacitor from its capacitance and the voltage across it, using E = ½ · C · V². Reports stored charge Q = C · V as well.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

µF
V

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

E = ½ · C · V²; Q = C · V.

In depth

Compute the energy stored in a capacitor from its capacitance and the voltage across it, using E = ½ · C · V². Reports stored charge Q = C · V as well.