Parallel Resistance Calculator

List your resistors to get their combined parallel resistance.

Runs in your browser — nothing is uploaded
Connection
Comma-separated; 4.7k, 1M or 4k7 notation works.

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For learning, hobby and prototyping use. Not professional electrical design advice — follow applicable codes and standards.

How to use Parallel Resistance Calculator

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

Series: R = R₁ + R₂ + …

Parallel: 1/R = 1/R₁ + 1/R₂ + …