Voltage Divider Calculator

Use this simple voltage divider calculator to find the output voltage, or to decide on what resistors to use.

The voltage divider has an input voltage, two resistors, and an output voltage. And you can find the output voltage by using the voltage divider formula:

V_{OUT} = V_{IN} \cdot \frac{R2}{R1+R2}

Just fill in the input voltage and resistor values in the calculator below to find the output voltage for any given input and resistor values:

Voltage Input (V1)
V
1st Resistance (R1)
2nd Resistance (R2)
Voltage Output (Vout)
=V
Voltage Calculator Diagram