Wheatstone Bridge Calculator
At balance: R1/R2 = R3/Rx ⇒ Rx = R3·R2/R1
How to Use This Calculator
Enter R1, R2, and R3 for a Wheatstone bridge in balance (zero galvanometer current). Click Calculate to get Rx.
Formula
At balance: R1/R2 = R3/Rx
Rx = (R3 · R2) / R1
Frequently Asked Questions
Do I need the supply voltage?
No. At balance, the ratio relation is independent of supply voltage.
What if the bridge is not balanced?
Adjust a known resistor until the galvanometer reads zero, then apply the formula.