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Inductor energy calculator

Compute the energy stored in an inductor from its inductance and current (E = ½LI²).

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Need Energy (J), Energy (mJ)? The Inductor energy calculator derives it from Inductance (mH), Current (A) in one step. For instance, with Inductance (mH) = 100 and Current (A) = 2 it returns Energy (J) = 0.2 and Energy (mJ) = 200.

How to use it

  1. Enter your values: Inductance (mH), Current (A).
  2. Read the result instantly: Energy (J), Energy (mJ).

Frequently asked questions

How does the Inductor energy calculator work?

It takes Inductance (mH) and Current (A) and derives Energy (J) and Energy (mJ) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Inductance (mH) and Current (A). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Inductance (mH) = 100 and Current (A) = 2, the calculator returns Energy (J) = 0.2 and Energy (mJ) = 200. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Inductance (mH) = 200 and Current (A) = 4 instead, Energy (J) goes from 0.2 to 1.6 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Inductance (mH) = 50 and Current (A) = 1, Energy (J) comes out at 0.025. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

At the bench: sizing a resistor for an LED, reading a colour band, working out a divider ratio, and checking a part will not cook.

What is the most common mistake?

Choosing a resistance and forgetting the power rating. A value that is electrically right will still burn if the package cannot dissipate what passes through it — check the watts as well as the ohms.

What is the difference between the Inductor energy calculator and the Capacitor energy calculator?

Both return Energy (J) and Energy (mJ). What differs is what they ask for: this one wants Inductance (mH) and Current (A), the Capacitor energy calculator wants Capacitance (µF) and Voltage (V). Use whichever matches the numbers you already have.

Is there a tool for the next step?

LED resistor calculator is the closest one after this: Find the series resistor needed to drive an LED from a supply voltage.

What else is worth having open alongside it?

Appliance Energy Cost Calculator and Home Energy Audit Calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
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