![]() FEMM is open-source software for electromagnetic simulation. This video shows two ways to calculate the inductance of a ferrite EI inductor. Video advice: Inductance Calculation using FEMM Always bear in mind that there is a tolerance on the stated AL value of a core. Enter inductance value (making sure to enter the units correctly as nH,uH or mH) and enter the AL value of the core. Click on the ‘Calculate’ button and the calculator will give you the theoretical number of turns of wire. ![]() ![]() Inductance Calculator Guidelines – If you need to know the number of turns of wire in a winding and you know the inductance measurement across the winding and you also know the AL value of the core. Enter the actual number of turns of wire and the measured inductance value (making sure to enter the units correctly as nH,uH or mH) Click on the ‘Calculate’ button and the calculator will give you the derived AL value of the core. If you need to calculate the AL value of a core and you know the number of turns and the inductance across a winding.
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