Parallel Resistance Calculator

Enter the resistance of up to 5 resistors in parallel into the calculator to determine the equivalent resistance.

Parallel Resistance Formula

The following formula is used to calculate the equivalent resistance of resistors in parallel.

1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5

  • Where R is the equivalent resistance
  • R1 – R5 are the resistances of each individual resistor

Example

How to calculate parallel resistance?

  1. First, determine the individual resistances.

    Measure the individual resistances of each resistor.

  2. Next, rearrange the equation above.

    Rearrange the equation above to solve for R. This would be R = 1/ (1/R1 + (1/R2) + …)

  3. Finally, calculate the resistance.

    Using the formula or calculator above, determine the equivalent resistance.

FAQ

What is a parallel resistance?

A parallel resistance is the equivalent resistance of a circuit with multiple resistors in which the current has the opportunity to flow through each resistor at the same time. This is in contrast to a series resistor where the current must flow through each resistor 1 at a time.


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