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Resistor in Parallel Calculator

Resistors side by side always total less than the smallest one. Paste one value per line for the combined resistance.

One resistance per line, in ohms.

Resistors

Total resistance --

The formula

1 / Rtotal = 1/R1 + 1/R2 + 1/R3 + ...

Two resistors:
Rtotal = (R1 x R2) / (R1 + R2)

How it works

Each resistor gives the current another path, so the combination always conducts better than any single one. The total is lower than the smallest resistor in the set, every time — a useful sanity check on your own arithmetic.

Two equal resistors in parallel give exactly half. That is the usual reason to do it: halving a value, or sharing current and therefore heat between two parts instead of one.

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