Equivalent Resistance Calculator
Find equivalent resistance for series, parallel, and simple mixed circuit groups.
Inputs
Result
Example Inputs: (100 + 220) in parallel with 330
Example Output: Approximate equivalent resistance = 162.35 Ohms
Live Result: Enter values and click Calculate.
Formula
Use series and parallel equations step-by-step to reduce mixed networks.
Worked Example
Use the example inputs and outputs above to walk through the calculation step-by-step.
FAQ
What is the difference between series and parallel?
Series adds resistances directly; parallel uses reciprocal sums.
How do I enter mixed networks?
Use expression mode on equivalent resistance pages with + for series and || for parallel, such as (100 + 220) || 330.
Can I use values like 4.7k?
Yes. Engineering notation is supported in resistor inputs.
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Formula Notes
This calculator emphasizes total equivalent resistance as a standalone intent.
Worked Example
Reduce the series branch first, then apply the parallel formula to the combined values.