When to use this calculator
Find magnetic energy stored in an ideal inductor. Assumes a linear unsaturated inductor with negligible loss.
Explore the dc circuits & components calculators for other questions in this topic. For a related calculation, use the Inductor Voltage Calculator: Find ideal inductor voltage from the rate of current change.
PUTTING IT INTO PRACTICE
Inductor Energy: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Inductance (mH) | 100 |
| Current (A) | 2 |
| Result | 0.2 J |
- Check the input labels and enter the example values above.
- Apply the relationship: Stored energy = inductance in henries × current²/2.
- The result is 0.2 J, rounded for display.
How to interpret your result
Assumes a linear unsaturated inductor with negligible loss.
Ideal component models omit tolerances, heat and parasitic effects. Distinguish nominal energy from usable energy for batteries. Component ratings and installation requirements need separate manufacturer and design checks.
Frequently asked questions
Can these calculations select a safe installation rating?
No. They explain ideal relationships and do not include every thermal, protective or regulatory requirement.
When is the inductor energy calculator useful?
Find magnetic energy stored in an ideal inductor. Assumes a linear unsaturated inductor with negligible loss.
How do I use the inductor energy calculator?
Enter inductance (mh), current (a). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Stored energy = inductance in henries × current²/2.
What should I check before using the result?
Assumes a linear unsaturated inductor with negligible loss.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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