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.

Input voltage (V)

Supply voltage applied across the divider.

R1 (Ω)

Resistance from the top of the divider to the tap point.

R2 (Ω)

Resistance from the tap point to ground.

Compute the divided output voltage across R2 of a two-resistor series divider: Vout = Vin * R2 / (R1 + R2). 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]

Output voltage (V)

Voltage available at the tap point across R2.

• Compact electronics formulas omit some combination of tolerances, temperature drift, bandwidth, loading, parasitics, noise spectrum, nonlinearity, clipping, calibration, layout, and device-specific limits. Typical datasheet values are not guaranteed limits.
• 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.

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