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Parallel Resistance Calculator

Equivalent resistance of parallel branches and the current in each branch.

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The equivalent resistance is always smaller than the smallest branch.

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Assumptions and limits.
  • Ideal parallel connection.

Reciprocal addition

1/R_total = 1/R1 + 1/R2 + …; each branch sees the same voltage.

Frequently asked questions

What happens if one branch opens?
The other branches keep operating; equivalent resistance rises.

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Total resistance of resistors connected in series, plus current and power for a supply voltage.

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Current Divider Calculator

Split a total current between two parallel resistors.
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