🔋 Capacitor Charge Calculator
Calculate the electric charge stored in a capacitor and the energy it holds, from capacitance and voltage.
1
µF
2
V
What this calculator does
This tool calculates the electric charge stored on a capacitor and the energy it holds when charged to a given voltage — fundamental relationships in basic circuit theory.
The formula
Stored charge Q = CV, where C is the capacitance and V is the voltage across the capacitor. Stored energy is E = ½CV², representing the work done to charge the capacitor to that voltage.
These are the standard textbook formulas for an ideal capacitor, used throughout electronics and electrical engineering education.
Last reviewed August 2026