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Capacitor Energy Calculator

Calculate stored energy and electric charge from capacitance and voltage.

01 / INPUTS

F
V

02 / RESULT

STORED ENERGY

0.05 J

Stored energy
0.05 J
Charge
0.01 C

Calculation trace

  1. 0.5 × 0.001 F × 10 V × 10 V = 0.05 J
    0.05 J
    Stored energy
  2. 0.001 F × 10 V = 0.01 C
    0.01 C
    Charge
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How it works

For capacitance C in farads and voltage V in volts, the stored energy is E = ½C·V² joules. The tool also reports charge using Q = C·V coulombs.

Assumptions & limits

  • Models an ideal capacitor and does not account for leakage, equivalent series resistance, dielectric loss or voltage-dependent capacitance.
  • Capacitance and voltage must both be positive finite numbers.
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FAQ

Why is voltage squared in the energy formula?
Charging from zero to V requires integrating the increasing capacitor voltage over the added charge, which gives E = ½C·V².
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