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Series / Parallel Resistance Calculator

Equivalent resistance of resistors in series or parallel.

Compute the equivalent resistance of any number of resistors wired in series or in parallel from a comma-separated list of ohm values.

Daniel Oh By Daniel Oh
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Series: R = R₁ + R₂ + ... + Rn. Parallel: 1/R = 1/R₁ + 1/R₂ + ... + 1/Rn.

In depth

Compute the equivalent resistance of any number of resistors wired in series or in parallel from a comma-separated list of ohm values.