Parallel Inductance Calculator

Equivalent Inductance for Parallel Coils

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Inductance values

L_n

Enter inductance values separated by commas (µH)

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Equivalent Inductance

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Parallel Inductor Formula

$$L_{\text{total}} = \frac{L_1 \cdot L_2}{L_1 + L_2}$$ $$\frac{1}{L_{\text{total}}} = \frac{1}{L_1} + \frac{1}{L_2} + \frac{1}{L_3} + \ldots + \frac{1}{L_n}$$

Where:

• $$L_{ ext{total}}$$ = total inductance (H)
• $$L_1$$, $$L_2$$, $$\ldots$$ = individual inductances (H)

These formulas assume no mutual inductance or coupling between inductors.

Parallel Inductance – Calculation Example

Given:

• $$L_1$$ = 10 mH
• $$L_2$$ = 15 mH

Calculation:

1. $$L_{\text{total}} = \frac{10 \cdot 15}{10 + 15} = \frac{150}{25} = 6~\text{mH}$$

When inductors are connected in parallel, the total inductance decreases, similar to resistors in parallel. This configuration is useful when a specific inductance value is needed but only larger inductors are available, or to share current load. It’s common in power electronics, RF circuits, and filters. Note that mutual inductance should be considered for tightly coupled coils.