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Wheatstone Bridge Calculator.

Calculate divider nodes and differential output for a resistive Wheatstone bridge.

On-device calculationNo signup
01

Set your values

Results update as you type.

Left divider: 2.5 V

Left divider

0.000000V
Right divider: 2.727273 V

Right divider

0.000000V
Bridge output: -0.227273 V

Bridge output

0.000000V

Results update automatically as you type.

Use Cases

Verify bridge balance condition

Quickly check if a Wheatstone bridge is balanced by entering resistor values and seeing if the differential output is zero. Useful for sensor calibration and circuit design.

Example: Set R1=100Ω, R2=200Ω, R3=150Ω, R4=300Ω, and V=5V to see a balanced bridge with 0V output.

Analyze sensor output

For resistive sensors like strain gauges or thermistors in a bridge configuration, compute the output voltage for given resistance changes and excitation.

Example: Change R4 slightly from 300Ω to 310Ω and observe the differential output change.

Frequently Asked Questions

What does the Wheatstone Bridge Calculator do?
It computes the voltages at the two divider nodes (V1 and V2) and the differential output (V1 - V2) for a resistive Wheatstone bridge, given the four resistor values (R1, R2, R3, R4) and the excitation voltage.
How is the differential output calculated?
The calculator uses the voltage divider rule: V1 = V_excitation * R2/(R1+R2) and V2 = V_excitation * R3/(R3+R4). The differential output is V1 - V2. When the bridge is balanced (R1/R2 = R3/R4), the output is zero.
What units are used for the inputs?
Resistors are entered in ohms (Ω) and the excitation voltage in volts (V). The outputs are in volts (V) for the node voltages and differential output.

Tips & Common Mistakes

Tips

  • Ensure all resistor values are in the same unit (ohms) before entering them.
  • For a balanced bridge, the ratio R1/R2 must equal R3/R4. Use the calculator to verify.
  • The differential output is the voltage difference between the two divider nodes, not the absolute node voltages.
  • Double-check your excitation voltage polarity; the calculator assumes a positive excitation across the bridge.

Common Mistakes to Avoid

  • Entering resistor values in different units (e.g., kΩ and Ω) without converting to ohms.
  • Confusing the node voltages V1 and V2 with the differential output.
  • Assuming the bridge is balanced without checking the ratio condition.

Last updated: August 13, 2026