Series Inductors Calculator

What Is Series Inductance?

When inductors are connected end to end so the same current flows through each one, they are in series. Total inductance is the sum of individual values because magnetic fluxes add along the path. Series inductors are common in RF filters, power supplies, and impedance matching networks.

Series Inductor Formula

For n inductors in series (assuming no mutual coupling):

$$L_{total} = L_1 + L_2 + \cdots + L_n$$

Example: 10 mH and 22 mH in series give $10 + 22 = 32$ mH total. Unlike parallel inductors, series combinations always increase total inductance.

Mutual Coupling Note

This formula assumes inductors are magnetically isolated. When coils are close together, mutual inductance changes the result. For coupled inductors, use $L_{eq} = L_1 + L_2 \pm 2M$ depending on polarity.

Frequently Asked Questions

Do series inductances always add?

Yes, when coils are uncoupled. Total inductance equals the arithmetic sum of individual values.

Is current the same through series inductors?

Yes. In a series path, the same current flows through each inductor at every instant.

What units should I use?

Enter all values in the same unit: henries (H), millihenries (mH), or microhenries (µH). The tool converts internally.

How does this differ from parallel inductors?

Series adds inductances directly. Parallel uses reciprocals: $1/L_{eq} = 1/L_1 + 1/L_2 + \cdots$.

Can I combine more than two inductors?

Yes. This tool supports up to six series inductors using the same summation formula.

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What Is Series Inductance?

Series Inductor Formula

Mutual Coupling Note

Frequently Asked Questions

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