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Capacitor Charge Calculator

Calculate electric charge and stored energy from capacitance and voltage.

01 / INPUTS

F
V

02 / RESULT

ELECTRIC CHARGE

0.01 C

Charge
0.01 C
Stored energy
0.05 J

Calculation trace

  1. 0.001 F × 10 V = 0.01 C
    0.01 C
    Charge
  2. 0.5 × 0.001 F × 10² V = 0.05 J
    0.05 J
    Stored energy
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How it works

For capacitance C in farads and voltage V in volts, the tool computes charge as Q = C·V in coulombs. It also computes stored energy as E = ½C·V² in joules.

Assumptions & limits

  • Models an ideal capacitor at the entered steady voltage; it does not model leakage, equivalent series resistance or charging time.
  • Capacitance and voltage must both be positive finite numbers.
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FAQ

What does one coulomb represent for a capacitor?
A capacitor holds one coulomb when a capacitance of one farad has one volt across it, because Q = C·V.
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