Capacitor Energy Calculator
Energy stored in a capacitor and the charge it holds, from capacitance and voltage.
Results
Energy
0.31250
J
Quantity
0.025000
C
What this tool does
Stored energy grows with the square of the voltage, so doubling the working voltage quadruples the energy — and the hazard. A large charged capacitor holds enough energy to be dangerous long after the power is switched off.
Formula
E = ½ × C × U²
Variables
| Symbol | Meaning | Unit |
|---|---|---|
c | Capacitance | µF |
u | Voltage | V |
E | Energy | J |
Q | Quantity | C |
Worked example
- Capacitance1000 µF
- Voltage25 V
- Energy0.31250 J
- Quantity0.025000 C
Limitations
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.