Resistors in Parallel Calculator

This calculator can be used to determine the total equivalent resistance of up to four (4) resistors in parallel.

Resistors are in series when there is a single current path that travels through each resistor in order.

Resistors are in parallel when there are multiple current paths that may have different values of resistance.

One of the most important quantities is the equivalent resistance of the circuit.

Even though resistors may come in complex configurations, we can model the circuit as a single resistor. This resistor will have the value of the equivalent resistance of the whole circuit.

Formula for Resistors in Parallel

The following formula will calculate the total equivalent resistance in a parallel circuit:

R_{eq} = \frac{1}{\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+...+\frac{1}{R_N}}=(\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+...+\frac{1}{R_N})^{-1}

You can find the derivation for this formula in the main lesson for resistors in parallel.

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