Capacitor Energy Calculator
Calculate energy stored in a capacitor.
Capacitor Energy measurements
Enter your values, then calculate.
Result
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Enter your measurements above to calculate.
CategoryPhysics
Inputs2
CalculationIn browser
How to calculate capacitor energy
This calculator finds the energy stored in a charged capacitor from its capacitance and voltage.
How the calculation works
Energy = 0.5 × Capacitance × Voltage².
Example
A 100 μF (0.0001 F) capacitor at 12V: 0.5×0.0001×144 = 0.0072 J.
Frequently asked questions
How is Result calculated?
Result = 0.5 × [Capacitance] × [Voltage] × [Voltage].
Is the Capacitor Energy Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Quick Insight
Capacitor Energy Calculator
Energy = 0.5 × Capacitance × Voltage².
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Your personalized explanation
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Capacitor Energy
- Energy scales with the square of voltage, so doubling voltage quadruples stored energy for the same capacitance.
- Keep capacitance in farads (convert from μF or nF) for a result in joules.
Common Capacitor Energy Mistakes to Avoid
- Forgetting to convert capacitance from microfarads to farads before calculating, which produces a result off by a factor of a million.
When to Use This Calculator
This calculator finds the energy stored in a charged capacitor from its capacitance and voltage.
Content reviewed: August 2026 · Robert Threadgill