What is this calculator?
Calculate equivalent series and parallel resistance.
What can you use it for?
Use it for practical planning, conversions, measurement or checking the result described here. Calculate equivalent series and parallel resistance.
How to use it
- Enter first resistance (ω).
- Enter second resistance (ω).
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
Parallel resistance = first resistance × second resistance/(first resistance+second resistance)
The formula uses the units and definitions shown above. Each input is substituted before the arithmetic is evaluated; the calculated output is rounded for display.
Worked example
First resistance (Ω): 100, Second resistance (Ω): 200. The result is 300 Ω (series resistance).
Assumptions and limits
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.
Frequently asked questions
What inputs does the Resistor Calculator need?
Use first resistance (ω), second resistance (ω). Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Resistor Calculator?
Use the units and formats shown in the input labels. Actual conditions and applicable standards may differ from this simplified calculation.