CalculatorCentrum

Inductor Series & Parallel Calculator

Add any number of inductors and get the series (sum) and parallel (reciprocal) equivalent inductance, with SI-prefix input.

Enter each inductance in henries. SI prefixes accepted:10u, 4m7, 100n. Blank rows are ignored.

Series total (L₁ + L₂ + …)–
Parallel total (1 / Σ 1/L)–
Inductors used–
SeriesParallel
Like resistors: series adds, parallel gives less than the smallest

Combining inductors

Inductors combine just like resistors. In series the inductances add; in parallel the reciprocals add, giving a total smaller than the smallest inductor.

Series: L = L₁ + L₂ + … + Lₙ

Parallel: 1/L = 1/L₁ + 1/L₂ + … + 1/Lₙ

This assumes the inductors are not magnetically coupled — i.e. their fields don't link. If coils share a core or sit close together, mutual inductance (M) shifts the result and these formulas are only an approximation.

Why it matters

Series and parallel inductors let you hit a target inductance or a higher current rating from parts on hand. Designing a filter or oscillator? Pair this with the RC time constantand planar inductor calculators.

Related calculators