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Parallel Resistor Calculator

Physics
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Calculates the total equivalent resistance of resistors connected in parallel.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Resistance of Resistor 1, Resistance of Resistor 2, Resistance of Resistor 3 (Optional), Resistance of Resistor 4 (Optional), and Resistance of Resistor 5 (Optional) in the units shown.

Step 2

Read Total Equivalent Resistance in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Two 100 Ohm Resistors

Resistance of Resistor 1: 100 Ohms; Resistance of Resistor 2: 100 Ohms; Resistance of Resistor 3 (Optional): 0 Ohms; Resistance of Resistor 4 (Optional): 0 Ohms; Resistance of Resistor 5 (Optional): 0 Ohms

Total Equivalent Resistance: 50 Ohms

Two 200 Ohm Resistors

Resistance of Resistor 1: 200 Ohms; Resistance of Resistor 2: 200 Ohms; Resistance of Resistor 3 (Optional): 0 Ohms; Resistance of Resistor 4 (Optional): 0 Ohms; Resistance of Resistor 5 (Optional): 0 Ohms

Total Equivalent Resistance: 100 Ohms

100 and 200 Ohm Resistors

Resistance of Resistor 1: 100 Ohms; Resistance of Resistor 2: 200 Ohms; Resistance of Resistor 3 (Optional): 0 Ohms; Resistance of Resistor 4 (Optional): 0 Ohms; Resistance of Resistor 5 (Optional): 0 Ohms

Total Equivalent Resistance: 66.66666667 Ohms

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