basic

Series & Parallel Resistor Equivalent Calculator

R_series = ΣR; 1/R_parallel = Σ(1/R) — equivalent resistance.

Calculates the equivalent resistance of up to five resistors connected in series and/or parallel combinations.

Priya Venkatesan By Priya Venkatesan
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

R_series = R1+R2+R3; 1/R_par = 1/R1+1/R2+1/R3

In depth

Calculates the equivalent resistance of up to five resistors connected in series and/or parallel combinations.