How it works
Calculate energy stored in an ideal capacitor. Capacitance is entered in microfarads and voltage in volts.
E = CV²/2; C(F) = C(µF) × 10⁻⁶
Worked example
Show example inputs and result
Capacitance: 1,000 · Voltage: 12.
- Stored energy
- 0.072 J
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy