Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Supply voltage

Required number input.

Resistance R1

Required number input.

Resistance R2

Required number input.

Compute the Thevenin voltage of a resistive divider from the supply voltage and both divider resistances. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Thevenin voltage

The resulting thevenin voltage returned as a number.

• A Thévenin equivalent applies only at the chosen terminals and under the assumed linear operating conditions. Frequency-dependent, nonlinear, time-varying, and dependent-source circuits require the appropriate impedance or small-signal treatment.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Series Cap Voltage Divider

  Compute the voltage across C1 of a series pair as supply volts times C2 / (C1 + C2).

• Thevenin Resistance

  Compute the Thevenin resistance in ohms of a resistive divider seen from its output.

• Voltage Sensor Divider Ratio

  Calculate the unloaded resistive voltage-divider ratio Rbottom/(Rtop+Rbottom); loading and resistor tolerance are excluded.