# Parallel Resistor Calculator

Free online parallel resistor calculator – calculate the equivalent resistance of multiple resistors in parallel, enter all resistor values then click the calculate button

## What is a Parallel Resistor?

A parallel resistor is a type of electrical circuit in which two or more resistors are connected side-by-side, with each resistor having its own path for the flow of electric current.

In a parallel resistor circuit, the total resistance is less than the value of the smallest resistor in the circuit, because the current can flow through multiple paths instead of just one.

## Formula of Parallel Resistor

The formula to calculate the total resistance of a parallel resistor circuit is:

1/Rtotal = 1/R1 + 1/R2 + 1/R3 + … + 1/Rn

• Rtotal = total resistance of the circuit
• R1, R2, R3, and Rn =  individual resistances of each resistor in the circuit.

## How to Calculate Parallel Resistors

Example:– 150Ω, 250Ω, and 300Ω resistors are connected in parallel then calculate equivalent/total resistance.

1/Rtotal = 1/R1 + 1/R2 + 1/R3 + … + 1/Rn

1/Rtotal = 1/R1 + 1/R2 + 1/R3

Rtotal = 1/150 + 1/250 + 1/300

Rtotal = 71.4285Ω

Total Resistance  = 71.4285Ω