Capacitor stored energy calculator

Calculate energy and charge with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use energy and charge to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Capacitance (µF)
1000
Voltage (V)
10
Energy (J)
0.05
Charge (C)
0.01

Try another scenario

Capacitance (µF)
1100
Voltage (V)
10
Energy (J)
0.055
Charge (C)
0.011
Calculation method

Calculation method

Energy (J)

a × 1e-6 × b × b ÷ 2

Charge (C)

a × 1e-6 × b

Symbols and units
a
Capacitance (µF)
b
Voltage (V)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Converts microfarads to farads before applying E = ½CV².
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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