Inductors In Series Calculator

When inductors are connected sequentially in a single path, current flows through each component consecutively. Because the magnetic fields generated by each inductor interact, their individual inductance values add together. The fundamental formula for calculating the total equivalent inductance (L_eq) in a series circuit is straightforward: L_eq = L1 + L2 + L3 + ... + Ln. This additive behavior mirrors resistors in series, meaning that chaining more inductors together always increases the overall inductance of the circuit.

Imagine you are assembling a custom filter circuit on a workbench and need to combine three individual inductors in a series chain to achieve a specific target inductance. You select three components with values of L1 = 15 mH (millihenries), L2 = 25 mH, and L3 = 10 mH. To find the total equivalent inductance, apply the series formula: L_eq = L1 + L2 + L3. Substituting your component values yields L_eq = 15 + 25 + 10, resulting in a total equivalent inductance of 50 mH for your circuit branch.

When working with inductors in series, always ensure your components are spaced adequately apart or magnetically shielded. Unshielded inductors placed too close together can suffer from mutual inductance, where the magnetic flux of one component interferes with its neighbors, altering your actual total inductance. Additionally, pay close attention to unit conversions—always keep your inputs in the same base unit, whether that is microhenries (µH), millihenries (mH), or henries (H), to avoid costly calculation errors.