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Resistor Calculator

Calculate equivalent resistance for a list of series or parallel resistors.

How It Works

Series R=ΣR. Parallel R=1/Σ(1/R). A zero-ohm parallel branch shorts the equivalent to zero. All resistances must be nonnegative.

Reference Sources

FAQs

How does this calculator work?

Series R=ΣR. Parallel R=1/Σ(1/R). A zero-ohm parallel branch shorts the equivalent to zero. All resistances must be nonnegative.

What assumptions should I check?

Check the units and definitions shown beside each input. Results use the values you enter.