Parallel Resistance Calculator
Combine resistors in parallel into one equivalent resistance via reciprocal summation.
Description
Calculate total conductance and equivalent resistance for positive resistors in parallel.
Parallel Resistance Calculator calculate total conductance and equivalent resistance for positive resistors in parallel.
Use this when several resistor branches share both nodes and must be replaced by one equivalent resistance for circuit analysis.
When to use Parallel Resistance Calculator
Use this when several resistor branches share both nodes and must be replaced by one equivalent resistance for circuit analysis.
How it works
Conductances 1/R are summed, and equivalent resistance is the reciprocal of that total. The output also exposes total conductance in siemens.1
Interpreting the result
Keep the input units, direction conventions, encoding, and ordering rules visible when reusing the result. Preserve the full returned value for downstream calculations and round only for presentation.
Assumptions and limitations
Every branch value must be positive. The ideal formula omits tolerance, temperature coefficient, parasitic elements, source impedance, and topology mistakes.
References
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Resistors in Series and Parallel — OpenStax