Science & Education
Capacitor Energy Calculator
· Last updated：2026-09-01
U = ½·C·V² with capacitance and voltage unit selectors, the stored charge Q = C·V, and auto-scaled energy output.
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Tool usage guide
Learn when to use this tool, what it supports, and how real users apply it.
Key facts
- Category
- Science & Education
- Input types
- number, select
- Output type
- text
- Sample coverage
- 4
- API ready
- Yes
When to use
- Sizing pulse-power storage capacitors or backup supercapacitor banks for electronic devices.
- Analyzing safety discharge requirements and stored energy levels in high-voltage circuit designs.
- Solving physics and electrical engineering problems involving capacitance, voltage, charge, and energy.
How it works
- 1Enter the capacitance value and choose its unit (F, mF, µF, nF, or pF).
- 2Enter the operating voltage across the capacitor and select the voltage unit (mV, V, or kV).
- 3The tool normalizes inputs to base SI units (farads and volts), evaluates stored energy U = ½·C·V² and charge Q = C·V, and presents the formatted results.
Capacitance: 200 µF, Voltage: 2 kV
Outcome
Yields an energy output of U = 400 J and a stored charge of Q = 0.4 C.