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Wheatstone Bridge Balance & Unknown Resistance

Rx = R3·R2/R1 — unknown resistance by bridge balance.

Calculates the unknown resistance Rx in a balanced Wheatstone bridge from the three known resistors.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

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  1. Fill in the inputs above using the units you already have.
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  3. Hover any result row for the underlying formula and intermediate values.

Formula

At balance: R1/R2 = R3/Rx → Rx = R2×R3/R1

In depth

Calculates the unknown resistance Rx in a balanced Wheatstone bridge from the three known resistors.