basic

Wheatstone Bridge Calculator

Solve for the unknown resistor in a balanced Wheatstone bridge.

Solve a balanced Wheatstone bridge for the unknown resistor R₄ from the three known resistors R₁, R₂, and R₃ using the balance condition R₁ · R₄ = R₂ · R₃.

Daniel Oh By Daniel Oh
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Ω
Ω
Ω

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

R₄ = R₂ · R₃ / R₁

In depth

Solve a balanced Wheatstone bridge for the unknown resistor R₄ from the three known resistors R₁, R₂, and R₃ using the balance condition R₁ · R₄ = R₂ · R₃.