Energy Stored in a Capacitor Calculator
⚡ Electricity & magnetism. Use the Energy stored in a capacitor formula to find energy, capacitance, voltage: pick the value you want, type the others, and the answer updates as you go.
Energy0.072 J
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Energy | J |
| Capacitance | F |
| Voltage | V |
Worked example
Find the energy when Capacitance = 0.001 F, Voltage = 12 V.
Using E = 1/2 C V²: Energy = 0.072 J.
Frequently asked questions
What is the formula for Energy stored in a capacitor?
E = 1/2 C V².
What do the letters stand for, and what units are used?
Energy in J, Capacitance in F, Voltage in V.
How do you calculate energy?
Put the values into E = 1/2 C V². For example, with Capacitance = 0.001 F, Voltage = 12 V, energy = 0.072 J.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (energy, capacitance, voltage) and fill in the others: it rearranges the formula for you.
