This gapped core inductance calculator finds the inductance of a gapped ferrite core from the turns, effective core area, and air-gap length. The gap dominates, so it sets the inductance. Enter the values above.
Formula (gap-dominated)
L ≈ μ₀ × N² × Ae ÷ lg
- N — turns, Ae — effective core area, lg — total air-gap length
Example
N = 50, Ae = 100 mm², lg = 1 mm: L ≈ 314 µH.
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Frequently Asked Questions
How do I calculate gapped core inductance?
Use L = mu0 times turns squared times core area divided by the air-gap length, since the gap dominates the reluctance.
Why add an air gap to a core?
The gap stores energy and raises the saturation current, so the inductor handles more DC before saturating.
Does the gap lower inductance?
Yes. A larger gap reduces inductance but improves energy storage and linearity.