How to use the capacitor energy calculator
Find energy and charge stored in a capacitor. Enter capacitance, voltage in the fields above; the charge, energy are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- C — Capacitance (µF)
- V — Voltage (V)
Worked example
With capacitance = 470 µF, voltage = 25 V, the calculator gives charge ≈ 11.75 mC; energy ≈ 146.875 mJ.
Frequently asked questions
What is the formula for the capacitor energy calculation?
Charge (mC) = C × V / 1000. Energy (mJ) = 0.5 × C × V × V / 1000. Here C is capacitance (µF), V is voltage (V).
What inputs do I need for the capacitor energy calculator?
You need capacitance in µF, voltage in V. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.