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Parallel Resistor Calculator

Find combined resistance of two resistors.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator finds the combined resistance of two resistors in both configurations: in series the resistances simply add (R = R1 + R2), while in parallel they combine as R = (R1 × R2) ÷ (R1 + R2), which always yields a total lower than either resistor alone.

Electronics hobbyists and students use it constantly when prototyping circuits, since resistors rarely come in the exact value a design calls for and combining two standard values in series or parallel is the usual workaround to hit a target resistance.

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