Voltage Divider Calculator
Compute divider output voltage or solve for R2 from a target output voltage.
Inputs
Result
Example Inputs: Vin = 12V, R1 = 10k, R2 = 10k
Example Output: Vout = 6V
Live Result: Enter values and click Calculate.
Formula
Vout = Vin * R2 / (R1 + R2), and R2 = (Vout * R1) / (Vin - Vout)
Worked Example
Use the example inputs and outputs above to walk through the calculation step-by-step.
FAQ
Can I solve for output voltage?
Yes. Enter Vin, R1, and R2 to get Vout.
Can I solve for resistor value from a target Vout?
Yes. Provide Vin, R1, and target Vout, and the calculator computes required R2.
When should I avoid a divider?
A passive divider is unsuitable for heavy loads because load current changes the output voltage.
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View ProductFormula Notes
Use resistor ratio to scale a source voltage to a lower reference output.
Worked Example
Equal resistors split the source in half, so 12V becomes 6V.