Inductor Energy Calculator
Energy stored in an inductor's magnetic field.
Enter your values
ⓘ Live results
Results
- Stored energy
- 200 mJ
- Stored energy
- 2.000e-1 J
- Inductance
- 100 mH
Quick answer
Energy E = 0.5 x L x I^2.
E = 0.5 L I^2
How to use the Inductor Energy Calculator
- 1Enter the inductor's inductance in millihenries.
- 2Enter the current flowing through it.
- 3Read the energy stored in its magnetic field.
Worked example
Using the values the calculator loads with:
Inputs
- Inductance100 mH
- Current2 A
Results
- Stored energy200 mJ
- Stored energy2.000e-1 J
- Inductance100 mH
Frequently asked questions
Why do inductors cause voltage spikes when switched off?
Collapsing the magnetic field induces a large voltage trying to maintain current flow — hence flyback diodes.
How does this compare to capacitor energy?
Both store energy but in different forms (magnetic vs electric field); formulas mirror each other.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.