# Inductor Calculators

This page contains a variety of calculators as an aid in learning about and designing with inductors.

It contains calculators for the total equivalent inductance of inductors in series and parallel.

## Inductors in Series Calculator

Main Page: Inductors in Series Calculator

The inductors in series calculator (just below) takes the values of up to four (4) inductors and calculates the total equivalent inductance.

In a series circuit, current must flow through every circuit component; there is only one current path. Inductance, in particular, increases with every additional inductor in a series circuit.

To use the calculator, enter the individual inductance values for up to four inductors below.

To find the total inductance in a series circuit (or a single branch of a parallel circuit), you just add up the inductances of everything in the circuit (or branch):

L_{eq}=L_1+L_2+L_3+...+L_N

## Inductors in Parallel Calculator

Main Page: Inductors in Parallel Calculator

The inductors in parallel calculator takes the values of up to four (4) inductors and calculates the total equivalent inductance.

Inductance, in particular, decreases with every additional inductor in a parallel circuit (each new current path). In the circuit below, each individual inductor (L1, L2 and L3) has a greater value of inductance than the three combined when connected together in a parallel orientation.

To use the calculator, first select the number of inductors. Enter the inductor values sequentially, starting with L1.

To find the equivalent inductance in a parallel circuit, you must find the reciprocal (‘ one over 1/ ‘) of the sum of the reciprocal of each individual value of inductance:

L_{eq} = \frac{1}{\frac{1}{L_1}+\frac{1}{L_2}+\frac{1}{L_3}+...+\frac{1}{L_N}}=(\frac{1}{L_1}+\frac{1}{L_2}+\frac{1}{L_3}+...+\frac{1}{L_N})^{-1}

If these calculators didn’t help, check out our other calculators for electronics or our comprehensive tutorials!