Parallel Resistance Calculator

Parallel Resistance

When resistors are connected side by side to create several paths for current flow within an electrical circuit, the overall resistance seen is known as parallel resistance.
Each resistor in a parallel design has the same voltage applied to it, but the circuit’s total current is distributed among the resistors according to their unique resistances.

The main goal of parallel resistance is to change the total resistance that the power source perceives in an electrical circuit by offering different paths for current passage.
As opposed to utilizing a single resistor, connecting resistors in parallel lowers the total resistance, enabling the circuit’s voltage division and current flow to be customized.

Understanding Parallel Resistance:

Key Principles:

Voltage: The voltage across each resistor in a parallel circuit is the same.

Current: The total circuit current is the sum of the individual branch currents.

Resistance: The total resistance of a parallel circuit is less than any of the individual branch resistances.

Properties of Parallel Resistance:

Equivalent Resistance: The total resistance of a parallel circuit is always less than the smallest resistance in the circuit.

Current Distribution: The current flowing through each resistor in a parallel circuit is not necessarily the same. It depends on the resistive value of each resistor.

Kirchhoff’s Current Law: The total current entering a node in a parallel circuit is equal to the total current leaving the node.

Real-World Applications:

Power Distribution: Parallel resistance is used in power distribution systems to distribute power to multiple devices.

Audio Circuits: Parallel resistance is used in audio circuits to combine multiple resistors to achieve a specific resistance value.Lighting Circuits: Parallel resistance is used in lighting circuits to combine multiple light bulbs to achieve a specific brightness.


  • Voltage Regulation
  • Load Balancing
  • Current Limiting
  • Signal Processing
  • Voltage Divider Circuits


In essence, parallel resistance serves as a cornerstone in electronics, enabling the amalgamation of multiple resistors to attain a desired resistance level. Mastery of parallel resistance is indispensable for the creation and assessment of electrical circuits, with wide-ranging practical implications across various real-world applications.

To find the parallel resistance (R1+R2) in a circuit, use our online calculator. The total equivalent resistance (R) of up to two resistors linked in parallel can be found with ease. For the resistor units, select either K or M ohms. Make the most of your circuit analysis with this useful tool.

Note : Don’t end with comma ( , )

Resistor R1
Resistor R2


\[R_p= \frac{1}{(\frac{1}{R1}+\frac{1}{R2})}\]


  • Rp = Total Parallel Resistance
  • R1 & R2 = Resistors connected in parallel

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