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Inductor Energy Storage Calculator

Find the energy stored in an inductor's magnetic field.

Inputs

Saved Scenarios

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Stored Energy (J)

0.2000

Spark says

How it's calculated

Formula

E=12LI2E = \dfrac{1}{2} L I^2
L
— Inductance
I
— Current through the inductor

What is the Inductor Energy Storage Calculator?

An inductor stores energy in its magnetic field, proportional to inductance and the square of the current — this is the electrical analog of kinetic energy, with inductance playing the role of mass and current the role of velocity.

How to use it

  1. 1 Enter the inductor's inductance in henries.
  2. 2 Enter the current flowing through it.

Worked examples

0.1 H, 2 A

About 0.2 joules stored.

Try it

Frequently asked questions

Why does energy depend on current squared?

Doubling current quadruples the stored energy — this quadratic relationship is why inductors in switching power supplies need careful current limiting to avoid excessive stored energy during faults.